DOCSLIB.ORG

Developments of Polyhedral Oligomeric Silsesquioxanes (Pass), Pass Nanocomposites and Their Applications: a Review

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Developments of Polyhedral Oligomeric Silsesquioxanes (Pass), Pass Nanocomposites and Their Applications: a Review Journal of Scientific & Industrial Research Vol. 68, June 2009, pp.437-464 Developments of polyhedral oligomeric silsesquioxanes (PaSS), pass nanocomposites and their applications: A review D Gnanasekaran, K Madhavan and B S R Reddy* Industrial Chemistry Laboratory, Central Leather Research Institute, Chennai-600 020, India Received 01 September 2008; revised 24 February 2009; accepted 13 March 2009 This review presents a brief account of recent developments in synthesis and properties of organic-inorganic hybrids using polyhedral oligomeric silsesquioxanes (POSS) nanoparticIe, and applications of POSS monomers and nanocomposites. Therma], rheology and mechanical properties of polyimides, epoxy polymers, polymethymethacrylate, polyurethanes, and various other polymer nanocomposites are discussed. Keywords: Nanocomposites, Polyhedral oligomeric silsesquioxanes, Therma] and mechanical properties Introduction extremely complex mixtures of silsesquioxanes. Later in A variety of physical property enhancements 1946, pass were isolated along with other volatile (processability, toughness, thermal and oxidative stability) compounds through thermolysis of polymeric products are expected to result from incorporation of an inorganic obtained from methyltrichlorosilane and component into an organic polymer matrix. Many dimethylchlorosilane cohydrolysisl6. A variety of pass organic-inorganic hybrid materiels have shown dramatic nanostructured chemicals contain one or more covalently improvement in macroscopic properties compared with bonded reactive functionalities that are suitable for their nonhybrid counterparts 1-6.Hybrid organic-inorganic polymerization, grafting, surface bonding, or other materials based on incorporation of polyoctahedral transformationsI7-ls. Incorporation of nanosized pass oligomeric silsesquioxanes (PaSS) into polymeric macromers into polymers has produced significant matrices have received a considerable attention7-'3. improvement in thermal and oxidative resistance as well Silsesquioxanes (Fig. I) 14,which consist of a rigid, as reduction in flammability of several PaSS-based crystalline silica-like core that is perfectly defined polymers; these systems then being suitable candidates in spatially (0.5-0.7 nm), have general formula high-temperature and fire-resistant applications 19-21.pass (RSiOI)u(HP)o5b' where R is a hydrogen atom or an compounds can be incorporated into polymers by blending, organic group and a and b are integer numbers (a = I, copolymerization or grafting22-29.PaSS-polymer blends 2,3, ...; b = 0, 1,2,3, ), with a + b = 217, where 17 is an create interesting materials, but occurring of microphase integer (n= I, 2, 3, ) and b = a + 2. Of several separation may decrease possible advantages connected structures of silsesquioxanes (random, ladder and cage), with nanoscale incorporation30. Organic polymers can be cage structures contain 8 silicon atoms placed at cube reinforced with pass by attaching single or multiple vertices. Cubic structural compounds (completely and polymerizable groups to pass cage. incompletely condensed silsesquioxanes) are commonly In catalysis chemistry, metallosilsesquioxanes are illustrated as T6, T7, Ts' T,o' and T12, based on the receiving considerable interest3I.32. Incompletely number of silicon atoms present in cubic structure condensed silsesquioxanes [cyclopenty Isilanetriol (Fig. 2). In early 1900s, Kippingl5 found that CY7Si709(OH)3] share structural similarities with polycondensation of siliconic acids invariably leads to B-cristobalite and B-tridymite and are thus quite realistic *Author for correspondence models for silanol sites on silica surfaces33.34.Incompletely• Tel.: (044) 24404427; Fax: 91(44) 2491 ]589 condensed silsesquioxane frameworks have attracted E-mail: [email protected] attention as models for silica35.36, as ligands in -~--~---···"'"._'.''''·'''tll'111'' 1IlII'III"jl," III '~III•.'III"._h'~lt"I*"'I"II' 438 J SCI IND RES VOL 68 JU:\E 2009 S.O,. Oct.m~ri<:Core l V-O.065nm' v = 0.9 nm' r a b c Fig. I-Silsesquioxanes: (a) Q8 (Q = Siam)' R =H, vinyl, epoxy, methacrylate, etc.; (b) RxTx(T = R-SiOJ/2), R = alkyl, alkene, acetylene, acrylate; (c) Typical sizes/volumesl4 homogeneous models for aluminosilicates37.3Sand silica extended concept of Hoebbel et apo and identified a supported catalysts39.40,and as building blocks for network high-yield route to obtain POSS cubes with hydride and solids41,42. vinyl functional groups by silylation of silicate anion (Sis020S)solution (Scheme 1). Methodologies adopted for Functionalization of Cubes with vinyl and Si-H groups permit selective POSS Monomer attachment of numerous moieties to cubes through New chemical reagents and nanocomposites (NCs) Pt-catalysed hydrosilylation (PCH).Octa have been developed using POSS molecule. Polyhedral (dimethylsilyloxy) silsesquioxane (QsMsH) and octa silsesquioxanes are prepared from monomers of XSiY, (hydrido) silsesquioxane (TsH) cubes can be modified type, where X is a chemically stable substituent into various octafunctionalized macromonomers by (CH3, phenyl, or vinyl), and Y is a highly reactive hydrosilylation reaction between terminal Si-H groups substituent (CI, OH, or OR). Thus, using XSiY3-type, on POSS cube with an unsaturated carbon double bond POSS can form linear, cyclic, or polycyclic siloxanes as in presence of a Pt catalyst (Scheme 2). A series of polyethYlene glycol (PEG) substituted octa nXSiY3 + l.SnHzO - (XSi015)n + 3nHY ... (1) silsesquioxanes51 prepared by PCH of unsaturated PEG with QsMJI, TsH and thermal effect of organic peripherals attached on vertices ofPOSS were studied. Octahydridosilsesquioxane43'45 (TsH), results from Another example of hydroxyi terminated POSS is hydrolysis condensation ofHSiCl3 with very low yield of products [TsH (15-20%) and T10H (5-10%) cubes]. reporled52 through PCH of QsMll with allyl alcohol. Controlling catalyst concentration and choosing Kudo ct af46 explored on synthesis of POSS and entire reaction scheme (Fig. 3). Reaction rate, degree of appropriate solvent undergo 100% C-silylation rather oligomerization, and yield of polyhedral compounds formed than O-silylation of -OH group of allyl alcohol. depend strongly on following factors47: i) Concentration Matisons et af53 reported preparation of octaisocyanato of initial monomer in solution is an important variable: ii) subslltuteo silsesquioxane by hydrosilylation ofQsMsH Nature of solvent: iii) Identity of substituent X in initial with m-isopropenyl-cx-cx' -dimethylbenzyl isocyanate in monomer; iv) Nature of functional groups Y in monomer; THF medium using Karstedt's catalyst, and proved that Isocvanate functionalised POSS macromer was suitable v) Type of catalyst: vi) Reaction temperature; vii) Rate of water addition; and viii) Solubility of polyhedral oligomers nanocrosslinkcr for preparation of organic-inorganic formed. Using these conditions, octameric silicate anion 1:ybrid polyurethane. A simple two-step synthetic systems were developed from hydrolysis and methodology was developed for octaphenol-POSS polycondensation of tetraalkoxysilane in presence of ,hrough PCE of 4-acetoxystyrene with QsMsH and tetramethylammonium (TMA) ions [N~(CH,)4] under subsequent hydrolysis of acetoxy units 54. appropriate conditions, which yield double four membered OgunniYI cf al55 reported synthesis of etheric chlorine• terminated silsesquioxane using 2-chloroethyl vinylether ring silicate anion (Sis020s.) selectively. Hasegawa ct a14S.49 I 'I 'I I '1"11 I I' ·1· , , GNANASEKARAN et al: POLYHEDRAL OLIGOMERIC SILSESQUIOXANES (POSS) NANOPARTICLES 439 0-- R O-Si-RJ / O-Si\/ -0 0__ R R R R R-Si\/ \O-Si-R/ \ ....--0, / O--S!"'--O~ ( \ \ ;5' '5;- / ' 51- ° R/0 ° °\ \° °\ ° R-S( -~i O~ L,R . / S' ,/ / \ \ / Si 1"0.--8{- ° O-Si --f'~Si_O-;R \ R R I R/ \ O-Si-R /\ ladder Random Fig. 2-ChemicaI structures of different types of silsesquioxanes 440 J SCI IND RES VOL 68 JUNE 2009 A HSi(OH)3 b) T2: H(OHl2SiOSi(OH)2H G' ~ ~ B" · No of Hydrogen bond ~J) \ /cp\ (0) T8 : (HSi01·5) 8 Fig. 3-Schematic representation of all processes from silanol (A, HSi(OH))) to TiU) " 'I"h'.jlj~.,.,~II." 0"". " .. , •. , I I I 'I I I ~I l' I 'I GNANASEKARAN et al: POLYHEDRAL OLIGOMERIC SILSESQUIOXANES (POSS) NANOPARTICLES 441 Scheme I-Synthesis of vinyl and hydride functionalised silsesquioxanes with TsR through PCR. Various epoxy functionalized and polycondensation of phenyl trichlorosilane in acetone POSS [Octakis(dimethylsiloxypropyl glycidylether) medium. Laine et a/63-65 successfully explored various silsesquioxane, Octa( ethy1cyclohexylepoxide dimethyl• reactive functional groups (amine, iodo- and bromo- ) on siloxy)silsesquioxane and octakis( dimethylsiloxy phenyl ring ofOPS (Scheme 3). Laine et a/63 successfully hexafluoropropy I glycidyl) silsesq uioxane] were . nitrated OPS using fuming nitric acid. successfully synthesized through PCR by reacting Octa(aminophenyl)silsesquioxane (OAPS) was prepared QsMsR with allyl glycidyl ether (AGE), 4-vinyl-1,2• in two steps by nitration of OPS in fuming nitric acid to cyclohexene epoxide and allyl-1,1,2,3,3,3-hexa• form octa- (nitrophenyl)silsesquioxane (ONPS) followed fluoropropyl ether respectively56,57. by mild reduction of ONPS using formic acid and Octakis( dimethylsiloxypropyl aminobenzoate) triethylamine in presence of PdlC catalyst, resulting in silsesquioxane have been successfully prepared by quantitative conversion with equal quantities of m- and reacting QsMsR with allyl-4-aminobenzoate through PCR p- nitro substituted in each phenyl ring.
Load more

Recommended publications
  • Polyhedral Oligomeric Silsesquioxane (POSS)-Modified Phenolic Resin
    e-Polymers 2021; 21: 316–326 Research Article Bing Wang, Minxian Shi, Jie Ding, and Zhixiong Huang* Polyhedral oligomeric silsesquioxane (POSS)-modified phenolic resin: Synthesis and anti-oxidation properties https://doi.org/10.1515/epoly-2021-0031 high hardness, high carbon residue yield, and flame resis- received January 24, 2021; accepted March 17, 2021 tance. It has been widely used in coatings, heat-barrier ( ) Abstract: In this work, octamercapto polyhedral oligo- materials, carbon material precursors, and adhesives 1 . meric silsesquioxane (POSS-8SH) and octaphenol poly- However, since phenolic groups and methylene groups in ’ ’ - - hedral oligomeric silsesquioxane (POSS-8Phenol) were PR s crosslinking structure, the PR shightemperature anti successfully synthetized. POSS-8Phenol was added into oxidation properties are always poor, and materials usually the synthesis process of liquid thermoset phenolic resin have cracks and deformation under the erosion of hot ( ) (PR) to obtain POSS-modified phenolic resin (POSS-PR). oxygen 2 . As the matrix resin of ablation materials or - Chemical structures of POSS-8SH, POSS-8Phenol, and refractory materials for aircraft or space shuttles, it is parti - POSS-PR were confirmed by FTIR and 1H-NMR. TG and cularly important to improve the anti oxidation properties ( ) DTG analysis under different atmosphere showed that of phenolic resins 3 . Previous works to modify phenolic char yield of POSS-PR at 1,000°C increased from 58.6% resin could be divided into two parts: one of the methods was to improve the molecular structure of PR, such as to 65.2% in N2, which in air increased from 2.3% to 26.9% at 700°C.
    [Show full text]
  • Chemfiles Vol 1 No 6
    ChemFilesChemFiles Vol.Vol. 1, 1, No. No. 6 6 •• 20012001 Hybrid inorganic–organic composites are an emerging class of new materials that hold significant promise.1 Materials are being designed with the good physical properties of ceramics and the excellent choice of functional group chemical reactivity associated with organic chemistry. New silicon-containing organic polymers, in general, and polysilsesquioxanes, in particular, have generated a great deal of interest because of their potential replacement for, and compatibility with silicon-based inorganics in the electronics, photonics, and other materials technologies.2-4 5,6 Hydrolytic condensation of trifunctional silanes yields network polymers or polyhedral clusters having the generic formula (RSiO1.5)n. Hence, they are known by the “not quite on the tip of the tongue” name silsesquioxanes. Each silicon atom is bound to an average of one and a half (sesqui) oxygen atoms and to one hydrocarbon group (ane). Typical functional groups that may be hydrolyzed/condensed include alkoxy- or chlorosilanes, silanols, and silanolates.7 Synthetic methodologies that combine pH control of hydrolysis/condensation kinetics, surfactant-mediated polymer growth, and molecular-templating mechanisms have been employed to control molecular–scale regularity and external morphology in the resulting inorganic-organic hybrids–from transparent nanocomposites, to mesoporous networks, to highly porous and periodic organosilica crystallites–all of which have the silsesquioxane 3,8-11 (or RSiO1.5) stoichiometry. These inorganic–organic hybrids offer a unique set of physical, chemical, and size–dependent properties that could not be realized from just ceramics or organic polymers alone; thus, silsesquioxanes are depicted as bridging the property space between these two component classes of materials.
    [Show full text]
  • Sio2/Ladder-Like Polysilsesquioxanes Nanocomposite Coatings: Playing with the Hybrid Interface for Tuning Thermal Properties and Wettability
    coatings Article SiO2/Ladder-Like Polysilsesquioxanes Nanocomposite Coatings: Playing with the Hybrid Interface for Tuning Thermal Properties and Wettability Massimiliano D’Arienzo 1,*, Sandra Dirè 2,3,* , Elkid Cobani 1, Sara Orsini 1, Barbara Di Credico 1 , Carlo Antonini 1 , Emanuela Callone 2,3, Francesco Parrino 2, Sara Dalle Vacche 4,5 , Giuseppe Trusiano 4 , Roberta Bongiovanni 4,5 and Roberto Scotti 1 1 Department of Materials Science, INSTM, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy; [email protected] (E.C.); [email protected] (S.O.); [email protected] (B.D.C.); [email protected] (C.A.); [email protected] (R.S.) 2 Department Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy; [email protected] (E.C.); [email protected] (F.P.) 3 “Klaus Müller” Magnetic Resonance Lab., Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy 4 Department of Applied Science and Technology, DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; [email protected] (S.D.V.); [email protected] (G.T.); [email protected] (R.B.) 5 Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, (INSTM) Via G. Giusti, 9, 50121 Firenze, Italy * Correspondence: [email protected] (M.D.); [email protected] (S.D.) Received: 11 August 2020; Accepted: 16 September 2020; Published: 23 September 2020 Abstract: The present study explores the exploitation of ladder-like polysilsesquioxanes (PSQs) bearing reactive functional groups in conjunction with SiO2 nanoparticles (NPs) to produce UV-curable nanocomposite coatings with increased hydrophobicity and good thermal resistance.
    [Show full text]
  • Selective Tripodal Titanium Silsesquioxane Catalysts for the Epoxidation of Unactivated Olefins
    University of Kentucky UKnowledge Theses and Dissertations--Chemistry Chemistry 2015 SELECTIVE TRIPODAL TITANIUM SILSESQUIOXANE CATALYSTS FOR THE EPOXIDATION OF UNACTIVATED OLEFINS Sarah M. Peak University of Kentucky, [email protected] Right click to open a feedback form in a new tab to let us know how this document benefits ou.y Recommended Citation Peak, Sarah M., "SELECTIVE TRIPODAL TITANIUM SILSESQUIOXANE CATALYSTS FOR THE EPOXIDATION OF UNACTIVATED OLEFINS" (2015). Theses and Dissertations--Chemistry. 52. https://uknowledge.uky.edu/chemistry_etds/52 This Doctoral Dissertation is brought to you for free and open access by the Chemistry at UKnowledge. It has been accepted for inclusion in Theses and Dissertations--Chemistry by an authorized administrator of UKnowledge. For more information, please contact [email protected]. STUDENT AGREEMENT: I represent that my thesis or dissertation and abstract are my original work. Proper attribution has been given to all outside sources. I understand that I am solely responsible for obtaining any needed copyright permissions. I have obtained needed written permission statement(s) from the owner(s) of each third-party copyrighted matter to be included in my work, allowing electronic distribution (if such use is not permitted by the fair use doctrine) which will be submitted to UKnowledge as Additional File. I hereby grant to The University of Kentucky and its agents the irrevocable, non-exclusive, and royalty-free license to archive and make accessible my work in whole or in part in all forms of media, now or hereafter known. I agree that the document mentioned above may be made available immediately for worldwide access unless an embargo applies.
    [Show full text]
  • Synthesis and Use of Metallized Polyhedral Oligomeric Silsesquioxane Catalyst Compositions
    (19) TZZ Z_T (11) EP 2 865 704 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 29.04.2015 Bulletin 2015/18 C08G 77/58 (2006.01) C08G 77/04 (2006.01) B01J 31/02 (2006.01) B01J 31/12 (2006.01) (2006.01) (2006.01) (21) Application number: 13190523.4 B01J 31/16 B01J 31/38 C08G 18/61 (2006.01) C08G 18/22 (2006.01) (22) Date of filing: 28.10.2013 (84) Designated Contracting States: • Huntsman (Europe) BVBA AL AT BE BG CH CY CZ DE DK EE ES FI FR GB 3078 Everberg (BE) GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (72) Inventor: The designation of the inventor has not Designated Extension States: yet been filed BA ME (74) Representative: Van den Broeck, Kristel Alice et al (71) Applicants: Huntsman (Europe) BVBA • HUNTSMAN INTERNATIONAL LLC Intellectual Property Department Salt Lake City, Utah 84108 (US) Everslaan 45 3078 Everberg (BE) (54) Synthesis and use of metallized polyhedral oligomeric silsesquioxane catalyst compositions (57) The present invention relates to a method to form a polyurethane material, a catalyst composition comprising metalized polyhedral oligomeric silsesquioxanes (POMS) compounds in combination with reactive compounds suitable to be used to provide a polyurethane material and the polyurethane material obtained using the catalyst composition. EP 2 865 704 A1 Printed by Jouve, 75001 PARIS (FR) EP 2 865 704 A1 Description FIELD OF INVENTION 5 [0001] The present invention relates to a novel catalyst composition comprising metallized polyhedral oligomeric silsesquioxanes (referred to as POMS) suitable for use as a catalyst in forming polyurethane materials.
    [Show full text]
  • Functional Open-Cage Silsesquioxanes As Specific Polymer Modifiers
    polymers Article Preparation of Tri(alkenyl)functional Open-Cage Silsesquioxanes as Specific Polymer Modifiers Katarzyna Mituła 1,2, Michał Dutkiewicz 2,3 , Julia Duszczak 1,2, Monika Rzonsowska 1,2 and Beata Dudziec 1,2,* 1 Faculty of Chemistry, Adam Mickiewicz University in Poznan, Uniwersytetu Pozna´nskiego 8, 61-614 Poznan, Poland; [email protected] (K.M.); [email protected] (J.D.); [email protected] (M.R.) 2 Centre for Advanced Technologies, Adam Mickiewicz University in Poznan, Uniwersytetu Pozna´nskiego10, 61-614 Poznan, Poland; [email protected] 3 Adam Mickiewicz University Foundation, Rubiez 46, 61-612 Poznan, Poland * Correspondence: [email protected]; Tel.: +48-6-1823-1878 Received: 3 April 2020; Accepted: 30 April 2020; Published: 6 May 2020 Abstract: The scientific reports on polyhedral oligomeric silsesquioxanes are mostly focused on the formation of completely condensed T8 cubic type structures and recently so-called double-decker derivatives. Herein, we report on efficient synthetic routes leading to trifunctionalized, open-cage silsesquioxanes with alkenyl groups of varying chain lengths from -vinyl to -dec-9-enyl and two types of inert groups (iBu, Ph) at the silsesquioxane core. The presented methodology was focused on hydrolytic condensation reaction and it enabled obtaining titled compounds with high yields and purity. A parallel synthetic methodology that was based on the hydrosilylation reaction was also studied. Additionally, a thorough characterization of the obtained compounds was performed, also in terms of their thermal stability, melting and crystallization temperatures (TGA and DSC) in order to show the changes in the abovementioned parameters dependent on the type of reactive as well as inert groups at Si-O-Si core.
    [Show full text]
  • Silsesquioxane Lego Chemistry : Catalytic Receptor Ensembles for Alkene Epoxidation
    Silsesquioxane lego chemistry : catalytic receptor ensembles for alkene epoxidation Citation for published version (APA): Gerritsen, G. (2011). Silsesquioxane lego chemistry : catalytic receptor ensembles for alkene epoxidation. Technische Universiteit Eindhoven. https://doi.org/10.6100/IR719867 DOI: 10.6100/IR719867 Document status and date: Published: 01/01/2011 Document Version: Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.
    [Show full text]
  • Understanding Microstructural Evolution in Mixed Metal-Oxide
    Understanding Microstructural Evolution in Mixed Metal-Oxide in Mixed Evolution MicrMicrostructural Understanding Silsesquioxane Glasses Through Wet-Chemical Synthesis Wet-Chemical Glasses Through SilsesquioSilsesquioxane Understanding Microstructural Uitnodiging xane Glasses Thr xane Evolution in Mixed Metal-Oxide ostructural Evolution in Mix Evolution ostructural Silsesquioxane Glasses Through Graag nodig in u en uw partner uit voor het bijwonen van de ough Wet-Chemic Wet-Chemical Synthesis openbare verdediging van mijn proefschrift: Understanding Microstructural Evolution in Mixed Metal-oxide al Synthesis Silsesquioxane Glasses Through ed Metal-Oxide Wet-Chemical Synthesis op vrijdag 28 maart 2014 om 12:45 h in de prof. dr. G Berkhoff-zaal (Collegezaal 4) van het gebouw de Waaier van de Universiteit Twente. Voorafgaand zal ik om 12:30 h mijn proefschrift in het kort toelichten. Aanluitend aan de verdediging is er een receptie ter plaatse Rogier Besselink2014 Rogier Vanaf 20:30 h bent u eveneens van harte welkom op het feest op Boerderij Bosch Rogier Besselink [email protected] Paranimfen: Tomasz Stawski Wouter Maijenburg ISBN: 978-90-365-3637-0 Rogier Besselink UNDERSTANDING MICROSTRUCTURAL EVOLUTION OF MIXED METAL OXIDE SILSESQUIOXANE GLASSES THROUGH WET-CHEMICAL SYNTHESIS Rogier Besselink PhD committee Chairman and secretary: Prof. dr. ir. J.W.M. Hilgenkamp University of Twente Supervisor: Prof. dr. ir. J.E. ten Elshof University of Twente Members: Prof. dr. L. van Wüllen University of Ausburg Prof. dr. A. Nijmeijer University of Twente Prof. dr. ing. D.H.A Blank University of Twente Prof. dr. A.J.A. Winnubst University of Science and Technology of China, Hefei / University of Twente Referent: Dr. A.
    [Show full text]
  • Composition Comprising Silylated Polymers and Polyhedral Oligomeric Metallo Silsesquioxane
    (19) TZZ ¥_T (11) EP 2 796 493 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 29.10.2014 Bulletin 2014/44 C08K 5/549 (2006.01) C08L 43/04 (2006.01) C08G 18/22 (2006.01) (21) Application number: 13165285.1 (22) Date of filing: 25.04.2013 (84) Designated Contracting States: • Huntsman (Europe) BVBA AL AT BE BG CH CY CZ DE DK EE ES FI FR GB 3078 Everberg (BE) GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (72) Inventor: The designation of the inventor has not Designated Extension States: yet been filed BA ME (74) Representative: Swinnen, Anne-Marie et al (71) Applicants: Huntsman (Europe) BVBA • HUNTSMAN INTERNATIONAL LLC Intellectual Property Department Salt Lake City, Utah 84108 (US) Everslaan 45 3078 Everberg (BE) (54) Composition comprising silylated polymers and polyhedral oligomeric metallo silsesquioxane (57) The present invention relates to a composition composition comprising a silylated polymer comprising comprising at least one silylated polymer and at least one the step of: contacting a silylated polymer with a polyhe- polyhedral oligomeric metallo silsesquioxane. The dral oligomeric metallo silsesquioxane. present invention also relates to a process of curing a EP 2 796 493 A1 Printed by Jouve, 75001 PARIS (FR) EP 2 796 493 A1 Description FIELD OF INVENTION 5 [0001] This invention relates to a composition comprising silylated polymers comprising alkoxysilyl and/or silanol moieties, and more specifically silylated polyurethanes and to a process to prepare such compositions.
    [Show full text]
  • Research Article Iron Oxide Arrays Prepared from Ferrocene- and Silsesquioxane-Containing Block Copolymers
    Hindawi Publishing Corporation International Journal of Polymer Science Volume 2012, Article ID 692604, 10 pages doi:10.1155/2012/692604 Research Article Iron Oxide Arrays Prepared from Ferrocene- and Silsesquioxane-Containing Block Copolymers Raita Goseki, Tomoyasu Hirai, Masa-aki Kakimoto, and Teruaki Hayakawa Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-36 Ookayama, Meguro-ku, Tokyo 152-8552, Japan Correspondence should be addressed to Teruaki Hayakawa, [email protected] Received 13 August 2012; Accepted 11 October 2012 Academic Editor: Maki Itoh Copyright © 2012 Raita Goseki et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Arrays of iron oxides as precursors of iron clusters were prepared by oxygen plasma treatment of block copolymer microphase- separated nanostructures in thin films. Block copolymers composed of ferrocene-containing and silsesquioxane-containing polymethacrylate (PMAPOSS-b-PMAHFC) were successfully prepared, with different molecular weights and compositions and narrow molecular weight distributions, by living anionic polymerization. The formed microphase-separated nanostructures in the bulk were characterized by wide- and small-angle X-ray scattering (WAXS and SAXS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thin films were prepared from a solution of PMAPOSS-b-PMAHFC in tetrahydrofuran by spin coating onto silicon wafers. Fingerprint-type line nanostructures were formed in the PMAPOSS-b-PMAHFCs thin films after solvent annealing with carbon disulfide. Oxygen plasma treatment provided the final line arrays of iron oxides based on the formed nanostructural patterns.
    [Show full text]
  • Dispersion States and Surface Characteristics of Physically Blended Polyhedral Oligomeric Silsesquioxane/Polymer Hybrid Nanocomposites
    The University of Southern Mississippi The Aquila Digital Community Dissertations Fall 12-2008 Dispersion States and Surface Characteristics of Physically Blended Polyhedral Oligomeric Silsesquioxane/Polymer Hybrid Nanocomposites Rahul Misra University of Southern Mississippi Follow this and additional works at: https://aquila.usm.edu/dissertations Part of the Materials Chemistry Commons, and the Polymer Chemistry Commons Recommended Citation Misra, Rahul, "Dispersion States and Surface Characteristics of Physically Blended Polyhedral Oligomeric Silsesquioxane/Polymer Hybrid Nanocomposites" (2008). Dissertations. 1154. https://aquila.usm.edu/dissertations/1154 This Dissertation is brought to you for free and open access by The Aquila Digital Community. It has been accepted for inclusion in Dissertations by an authorized administrator of The Aquila Digital Community. For more information, please contact [email protected]. The University of Southern Mississippi DISPERSION STATES AND SURFACE CHARACTERISTICS OF PHYSICALLY BLENDED POLYHEDRAL OLIGOMERIC SILSESQUIOXANE/POLYMER HYBRID NANOCOMPOSITES by Rahul Misra Abstract of a Dissertation Submitted to the Graduate Studies Office of The University of Southern Mississippi in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy December 2008 COPYRIGHT BY RAHUL MISRA 2008 The University of Southern Mississippi DISPERSION STATES AND SURFACE CHARACTERISTICS OF PHYSICALLY BLENDED POLYHEDRAL OLIGOMERIC SILSESQUIOXANE/POLYMER HYBRID NANOCOMPOSITES by Rahul Misra A Dissertation
    [Show full text]
  • Atomistic Simulations of Octacyclopentyl Polyhedral Oligomeric Silsesquioxane Polyethylene Nanocomposites
    Atomistic Simulations of Octacyclopentyl Polyhedral Oligomeric Silsesquioxane Polyethylene Nanocomposites by Franco M. Capaldi M.S. Mechanical Engineering Massachusetts Institute of Technology, 2001 B.S. Mechanical Engineering Brown University, 1999 SUBMITTED TO THE DEPARTMENT OF MECHANICAL ENGINEERING IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTORATE OF PHILOSOPHY IN MECHANICAL ENGINEERING AT THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY JUNE 2005 MASSACHUSETTS INSTI UTE OF TECHNOLOGY 0 Franco M. Capaldi. All rights reserved. JU 62005 The author hereby grants to MIT permission to reproduce And to distribute publicly paper and electronic LIBRARIES copies of this thesis document in whole or in part. Signature of Author: Department of Mechanical Engineering 005 Certified by: . nOyce Professor of Mechanical Engineering ory C. Rutledge tical Engineering Accepted by: Lallit Anand Chairman, vepartmen Lommittee on Graduate Students BARKER Atomistic Simulations of Octacyclopentyl Polyhedral Oligomeric Silsesquioxane Polyethylene Nanocomposites Franco M. Capaldi Submitted to the Department of Mechanical Engineering On March 14, 2005 in Partial Fulfillment of the Requirements for the Degree of Doctorate of Philosophy in Mechanical Engineering As the scientific community develops the ability to create composites which incorporate nanoscopic filler particles, the detailed atomic arrangement and atomic interactions become significant in determining the composite properties. Nanoscopic fillers such as carbon nanotubes, polyhedral oligomeric
    [Show full text]