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Oligomeric A2 + B3 Approach to Branched Poly(Arylene Ether Sulfone)
“One-Pot” Oligomeric A 2 + B 3 Approach to Branched Poly(arylene ether sulfone)s: Reactivity Ratio Controlled Polycondensation A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science By ANDREA M. ELSEN B.S., Wright State University, 2007 2009 Wright State University WRIGHT STATE UNIVERSITY SCHOOL OF GRADUATE STUDIES June 19, 200 9 I HEREBY RECOMMEND THAT THE THESIS PREPARED UNDER MY SUPERVISION BY Andrea M. Elsen ENTITLED “One-Pot” Oligomeric A2 + B3 Approach to Branched Poly(arylene ether sulfone)s: Reactivity Ratio Controlled Polycondenstation BE ACCEPTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Science . _________________________ Eric Fossum, Ph.D. Thesis Director _________________________ Kenneth Turnbull, Ph.D. Department Chair Committee on Final Examination ____________________________ Eric Fossum, Ph.D. ____________________________ Kenneth Turnbull, Ph.D. ____________________________ William A. Feld, Ph.D. ____________________________ Joseph F. Thomas, Jr., Ph.D. Dean, School of Graduate Studies Abstract Elsen, Andrea M. M.S., Department of Chemistry, Wright State University, 2009. “One-Pot” Oligomeric A 2 + B 3 Approach to Branched Poly(arylene ether sulfone)s: Reactivity Ratio Controlled Polycondensation The synthesis of fully soluble branched poly(arylene ether)s via an oligomeric A 2 + B 3 system, in which the A 2 oligomers are generated in situ, is presented. This approach takes advantage of the significantly higher reactivity toward nucleophilic aromatic substitution reactions, NAS, of B 2, 4-Fluorophenyl sulfone, relative to B 3, tris (4-Fluorophenyl) phosphine oxide. The A 2 oligomers were synthesized by reaction of Bisphenol-A and B 2, in the presence of the B 3 unit, at temperatures between 100 and 160 °C, followed by an increase in the reaction temperature to 180 °C at which point the branching unit was incorporated. -
Development of Polysulfone Hollow Fiber Porous Supports for High Flux Composite Membranes: Air Plasma and Piranha Etching
fibers Article Development of Polysulfone Hollow Fiber Porous Supports for High Flux Composite Membranes: Air Plasma and Piranha Etching Ilya Borisov 1,*, Anna Ovcharova 1,*, Danila Bakhtin 1, Stepan Bazhenov 1, Alexey Volkov 1, Rustem Ibragimov 2, Rustem Gallyamov 2, Galina Bondarenko 1, Rais Mozhchil 3, Alexandr Bildyukevich 4 and Vladimir Volkov 1 1 A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow 119991, Russia; [email protected] (D.B.); [email protected] (S.B.); [email protected] (A.V.); [email protected] (G.B.); [email protected] (V.V.) 2 Kazan National Research Technological University, Kazan 420015, Russia; [email protected] (R.I.); [email protected] (R.G.) 3 National Research Nuclear University “MEPhI”, Moscow 115409, Russia; [email protected] 4 Institute of Physical Organic Chemistry, National Academy of Sciences of Belarus, Minsk 220072, Belarus; [email protected] * Correspondence: [email protected] (I.B.); [email protected] (A.O.); Tel.: +7-495-955-4893 (I.B.); +7-495-647-59-27 (A.O.) Academic Editors: Alberto Figoli and Tao He Received: 30 December 2016; Accepted: 4 February 2017; Published: 13 February 2017 Abstract: For the development of high efficiency porous supports for composite membrane preparation, polysulfone (PSf) hollow fiber membranes (outer diameter 1.57 mm, inner diameter 1.12 mm) were modified by air plasma using the low temperature plasma treatment pilot plant which is easily scalable to industrial level and the Piranha etch (H2O2 + H2SO4). Chemical and plasma modification affected only surface layers and did not cause PSf chemical structure change. -
Polyacrylonitrile Ternary System
Thermodynamic Study of a Water–Dimethylformamide– Polyacrylonitrile Ternary System Lianjiang Tan,1 Ding Pan,1 Ning Pan2 1State Key Laboratory for Chemical Fiber Modification and Polymer Materials, Donghua University, Shanghai 201620, People’s Republic of China 2Biological and Agricultural Engineering Department, University of California, Davis, California 65616 Received 23 October 2007; accepted 6 March 2008 DOI 10.1002/app.28392 Published online 15 September 2008 in Wiley InterScience (www.interscience.wiley.com). ABSTRACT: Experimental cloud-point data were ob- formation. The skin–core structure and fingerlike pores in tained by cloud-point titration. The phase diagram for a polyacrylonitrile fiber may be effectively eliminated if the ternary system of water–dimethylformamide–polyacryloni- composition of the spinning solution is properly chosen, trile was determined by numerical calculation on the basis and consequently, homogeneous polyacrylonitrile fiber of the extended Flory–Huggins theory and was found to with a bicontinuous structure and good mechanical proper- agree well with the cloud-point data. To construct the theo- ties can be obtained through the spinning process. Ó 2008 retical phase diagram, three binary interaction parameters Wiley Periodicals, Inc. J Appl Polym Sci 110: 3439–3447, 2008 were obtained with different methods. The ternary phase diagram was used to investigate the mechanism of fiber Key words: fibers; mixing; phase behavior; thermodynamics INTRODUCTION with the method of cloud-point titration.1–11 At high polymer concentration, however, the interaction Polyacrylonitrile (PAN) is soluble in many polar or- between macromolecules is so strong that the poly- ganic liquids, such as dimethylformamide (DMF), di- mer solution shows signs of crystallization or methyl sulfoxide, and dimethyl acetemide. -
II. Plasticizer-Free Polyvinyl Chloride, Plasticizer-Free Copolymers of Vinyl
This is an unofficial translation. Only the German version is binding. II. Plasticizer-free Polyvinyl Chloride, Plasticizer-free Copolymers of Vinyl Chlo- ride and Mixtures of these Polymers with other Copolymers and Chlorinated Polyolefins Containing Mainly Vinyl Chloride in the Total Mixture As of 01.01.2012 The monomers and other starting substances as well as additives used in the production of plasticizer-free polyvinyl chloride, plasticizer-free copolymers of vinyl chloride containing mainly vinyl chloride, mixtures of these polymers with other copolymers, and chlorinated polyolefins containing mainly vinyl chloride in the total mixture are subject to the requirements of the Commission Regulation (EU) No 10/2011. Otherwise, there are no objections to the use of these plastics for commodities in the sense of § 2, Para. 6, No 1 of the Food and Feed Code (Lebensmittel- und Futtermittelgesetzbuch), pro- vided they are suitable for their intended purpose and comply with the following conditions: 1. The use of monomers and other starting materials for polyethylene is subject to the stipula- tions of the Commission Regulation (EU) No 10/2011. The evaluation presented in the following refers to polymers from the following monomeric starting substances: a) Vinyl chloride b) Vinylidene chloride c) Trans-dichloroethylene d) Vinylesters of aliphatic carbonic acids C2-C18, in so far as covered by the positive list of the Commission Regulation (EU) No 10/2011 e) Esters of acrylic acid, methacrylic acid and/or maleic acid or fumaric acid with -
Radel® PPSU, Udel® PSU, Veradel® PESU & Acudel® Modified PPSU
Radel ® | Udel ® | Veradel ® | Acudel ® Radel® PPSU, Udel® PSU, Veradel® PESU & Acudel® modified PPSU Processing Guide SPECIALT Y POLYMERS 2 \ Sulfone Polymers Processing Guide Table of Contents Introduction ............................. 5 Part Ejection . 14 Draft . 14 Ejector pins and/or stripper plates . 14 Sulfone Polymers........................ 5 Udel® Polysulfone (PPSU) . 5 Injection Molding Equipment ............. 15 ® Veradel Polyethersulfone (PESU) . 5 Controls . 15 ® Radel Polyphenylsulfone (PPSU) . 5 Clamp . 15 ® Acudel modified PPSU . 5 Barrel Capacity . 15 Press Maintenance . 15 Resin Drying . .6 Screw Design . 15 Rheology................................ 8 Screw Tips and Check Valves . 15 Viscosity-Shear Rate ..................... 8 Nozzles . 16 Molding Process . 16 Resin Flow Characteristics . 9 Melt flow index . 9 Polymer Injection or Mold Filling . 16 Spiral flow . 9 Packing and Holding . 17 Injection Molding . .10 Cooling . 17 Molds and Mold Design .................. 10 Machine Settings ....................... 17 Tool Steels . 10 Barrel Temperatures . 17 Mold Dimensions . 10 Mold Temperature . 18 Mold Polishing . 10 Residence Time in the Barrel . 18 Mold Plating and Surface Treatments . 10 Injection Rate . 18 Tool Wear . 10 Back Pressure . 18 Mold Temperature Control . 10 Screw Speed . 18 Mold Types . 11 Shrinkage . 18 Two-plate molds . 11 Three-plate molds . 11 Regrind ............................... 19 Hot runner molds . 11 Cavity Layout . 12 Measuring Residual Stress ............... 19 Runner Systems . 12 Extrusion............................... 22 Gating . 12 Sprue gating . 12 Edge gates . 13 Predrying ............................. 22 Diaphragm gates . 13 Tunnel or submarine gates . 13 Extrusion Temperatures ................. 22 Pin gates . 13 Screw Design Recommendations . 22 Gate location . 13 Venting . 14 Sulfone Polymers Processing Guide / 3 Die Design ............................. 22 Extruded Product Types . 23 Wire . 23 Film . 23 Sheet . 23 Piping and tubing . 23 Start-Up, Shut-Down, and Purging ....... -
Improvement of Devulcanization Yield During Reclamation Ofwaste Tires
Global Journal of Researches in Engineering Chemical Engineering Volume 13 Issue 1 Version 1.0 Year 2013 Type: Double Blind Peer Reviewed International Research Journal Publisher: Global Journals Inc. (USA) Online ISSN: 2249-4596 & Print ISSN: 0975-5861 Improvement of Devulcanization Yield during Reclamation of Waste Tires By Dr. Kalrenganathan Sharma Lone Star College University Park Abstract - Waste tire recycling has become a bigger environmental problem. Despite regulations waste tires are stockpiled and often are breeding ground for west Nile virus and mosquitoes that cause pandemic. A number of times waste tires are incinerated or pyrolysis. Reclamation of value in the rubber portion of the waste tires may be more profitable and more environmentally benign compared with incineration and fuel use methods. Devulcanization and depolymerization reactions can lead to recovery of polybutadiene and butadiene monomer. Competing parallel reactions after the devulcanization step is studied in more detail. Dynamics of the general Denbigh scheme of reactions in a CSTR is studied. The composition of the species involved is obtained as a function of time from model solutions. A general state space form is proposed for simultaneous series-parallel reactions. Types of instability that may arise depends on the eigenvalues of the system. The Eigenvalues of the sparse matrix indicate that the system is of the integrating type. Solutions can be obtained from the eigenvalues for 7 species. Information from the model solution can be used to optimize the yield of rubber during reclamation of rubber from waste tires. GJRE-C Classification : FOR Code: 900402 Improvement of Devulcanization Yield during Reclamation of Waste Tires Strictly as per the compliance and regulations of : © 2013. -
A Review of Electrospun Carbon Fibers As Electrode Materials for Energy Storage
A Review of Electrospun Carbon Fibers as Electrode Materials for Energy Storage The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Mao, Xianwen, T. Hatton, and Gregory Rutledge. “A Review of Electrospun Carbon Fibers as Electrode Materials for Energy Storage.” COC 17, no. 13 (June 1, 2013): 1390–1401. As Published http://dx.doi.org/10.2174/1385272811317130006 Publisher Bentham Science Version Author's final manuscript Citable link http://hdl.handle.net/1721.1/92409 Terms of Use Creative Commons Attribution-Noncommercial-Share Alike Detailed Terms http://creativecommons.org/licenses/by-nc-sa/4.0/ A Review of Electrospun Carbon Fibers as Electrode Materials for Energy Storage Xianwen Mao, T. Alan Hatton, and Gregory C. Rutledge* Department of Chemical Engineering, Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge Massachusetts, 02139, USA E-mail: [email protected] Abstract: The applications of electrospun carbon fiber webs to the development of energy storages devices, including both supercapacitors and lithium ion batteries (LIB), are reviewed. Following a brief discussion of the fabrication process and characterization methods for ultrafine electrospun carbon fibers, recent advances in their performance as supercapacitors and LIBs anode materials are summarized. Optimization of the overall electrochemical properties of these materials through choice of thermal treatment conditions, incorporation of additional active components (such as carbon nanotubes, metal oxides, and catalysts), and generation of novel fibrous structures (such as core-shell, multi-channel or porous fibers) is highlighted. Further challenges related to improving the conductivity, surface area, and mechanical properties of the carbon nanofiber webs, as well as the scale-up ability of the fabrication technique, are discussed. -
Biocompatibility of Polyimides: a Mini-Review
materials Review Biocompatibility of Polyimides: A Mini-Review Catalin P. Constantin 1 , Magdalena Aflori 1 , Radu F. Damian 2 and Radu D. Rusu 1,* 1 “Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Aleea Grigore Ghica Voda 41A, Iasi-700487, Romania; [email protected] (C.P.C.); mafl[email protected] (M.A.) 2 SC Intelectro Iasi SRL, Str. Iancu Bacalu, nr.3, Iasi-700029, Romania; [email protected] * Correspondence: [email protected]; Tel.: +40-232-217454 Received: 14 August 2019; Accepted: 25 September 2019; Published: 27 September 2019 Abstract: Polyimides (PIs) represent a benchmark for high-performance polymers on the basis of a remarkable collection of valuable traits and accessible production pathways and therefore have incited serious attention from the ever-demanding medical field. Their characteristics make them suitable for service in hostile environments and purification or sterilization by robust methods, as requested by most biomedical applications. Even if PIs are generally regarded as “biocompatible”, proper analysis and understanding of their biocompatibility and safe use in biological systems deeply needed. This mini-review is designed to encompass some of the most robust available research on the biocompatibility of various commercial or noncommercial PIs and to comprehend their potential in the biomedical area. Therefore, it considers (i) the newest concepts in the field, (ii) the chemical, (iii) physical, or (iv) manufacturing elements of PIs that could affect the subsequent biocompatibility, and, last but not least, (v) in vitro and in vivo biocompatibility assessment and (vi) reachable clinical trials involving defined polyimide structures. The main conclusion is that various PIs have the capacity to accommodate in vivo conditions in which they are able to function for a long time and can be judiciously certified as biocompatible. -
Synthesis and Some Solution Properties of Block Copolymer Styrene—Acrylonitrile
Synthesis and some solution properties of block copolymer styrene—acrylonitrile V. CHRÁSTOVÁ, D. MIKULÁŠOVA, P. CITOVICKÝ, and J. SCHENKMAYER Department of Chemical Technology of Plastics and Fibres, Slovak Technical University, CS-812 37 Bratislava Received 19 June 1986 Styrene—acrylonitrile block copolymers were synthesized by emulsion polymerization at 30 °C, in which peroxide of powdered isotactic polypropyl ene as a heterogeneous initiator, disodium salt of ethylenediaminetetraace- tic acid as an activator, and Slovasol 2430 as a nonionic emulsifier were used. For the preparation of the block copolymer one of the characteristic proper ties of the mentioned polymerization system, i.e. the existence of long-living polystyrene radical in emulsion was evaluated. After removing of the initia tor the first monomer — styrene was polymerized up to a certain conversion and then acrylonitrile was added to the growing polystyrene radicals. A block copolymer was formed, which contained a pure polystyrene block and an acrylonitrile sequence with fragments of styrene. The obtained co polymers with various styrene—acrylonitrile ratio were characterized by IR spectroscopy. By means of viscometry and light scattering some of their properties in methyl ethyl ketone and ^TV-dimethylformamide were stud ied. Блок-сополимеры стирола и акрилонитрила были получены по средством эмульсионной полимеризации при 30 °С, в которой применя лись перекись порошкообразного изотактического полипропилена в качестве гетерогенного инициатора, двунатриевая соль этилен- диаминтетрауксусной кислоты в качестве активатора и Словасол 2430 в качестве неионного эмульгатора. В целях получения блок-сополимера оценивалось одно из характеристических свойств упомянутой по- лимеризационной системы, а именно присутствие долгоживущих по листирол ьных радикалов в эмульсии. После устранения инициатора первый мономер — стирол — полимеризовался до определенной степени конверсии, а затем к растущим полистирольным радикалам добавлялся акрилонитрил. -
Technical Datasheet: Udel® P-1700
Udel® P-1700 Polysulfone Solvay Specialty Polymers www.ulprospector.com Technical Data Product Description Udel® P-1700 polysulfone (PSU) is a tough, rigid, high-strength thermoplastics suitable for continuous use up to 300°F (149°C). It is resistant to oxidation and hydrolysis and withstand prolonged exposure to high temperatures and repeated sterilization. Udel® P-1700 polysulfone is highly resistant to mineral acids, alkali and salt solutions. Resistance to detergents and hydrocarbon oils is good, but the resin may be attacked by polar solvents such as ketones, chlorinated hydrocarbons and aromatic hydrocarbons. These resins are also highly resistant to degradation by gamma or electron beam radiation. Electrical properties of Udel® P-1700 polysulfones are stable over a wide temperature range and after immersion in water or exposure to high humidity. The resins comply with FDA 21 CFR 177.1655 and may be used in articles intended for repeated use in contact with foods. Additionally, they are approved by the NSF, by the Department of Agriculture for contact with meat and poultry and by the 3-A Sanitary Standards of the Dairy Association. • Transparent: Udel® P-1700 CL 2611 CMP • Transparent: Udel® P-1700 NT 06 • Transparent: Udel® P-1700 NT 11 • Opaque Black : Udel® P-1700 BK 937 • Opaque White: Udel® P-1700 WH 6417 • Opaque White: Udel® P-1700 WH 7407 • Opaque Gray: Udel® P-1700 GY 8057 General Material Status • Commercial: Active Literature 1 • Technical Datasheet UL Yellow Card 2 • E36098-231084 • Solvay Specialty Polymers Search for -
Specifications Guide Americas Petrochemicals Latest Update: July 2020
Specifications Guide Americas Petrochemicals Latest update: July 2020 Definitions of the trading locations for which Platts publishes daily indexes or assessments 2 Olefins 3 US aromatics 6 Latin American aromatics 8 US polymers 10 Latin American polymers 13 US intermediates 16 US hydrocarbon solvents 17 US chlor alkali 18 US oxygenated solvents 19 Liquid and gas chemical freight 21 Global petrochemical indices 22 Revision history 23 www.spglobal.com/platts Specifications Guide Americas Petrochemicals: July 2020 DEFINITIONS OF THE TRADING LOCATIONS FOR WHICH PLATTS PUBLISHES DAILY INDEXES OR ASSESSMENTS The following specifications guide contains the primary specifications for S&P Global Platts petrochemical assessments in the Americas. All the assessments listed here employ Platts Assessments Methodology, as published at https://www.spglobal.com/platts/plattscontent/_assets/_files/en/our-methodology/methodology-specifications/platts-assessments-methodology-guide.pdf. These guides are designed to give Platts subscribers as much information as possible about a wide range of methodology and specification questions. This guide is current at the time of publication. Platts may issue further updates and enhancements to this methodology and will announce these to subscribers through its usual publications of record. Such updates will be included in the next version of this guide. Platts editorial staff and managers are available to provide guidance when assessment issues require clarification. OLEFINS Assessment CURRENCY CODE Mavg Wavg TYPE -
Using an Inhibitor to Prevent Plasticizer Migration from Polyurethane Matrix to EPDM Based Substrate Rezaei-Vahidian Hadi, Farajpour Tohid, Abdollahi Mahdi
Using an Inhibitor to Prevent Plasticizer Migration from Polyurethane Matrix to EPDM Based Substrate Rezaei-Vahidian Hadi, Farajpour Tohid, Abdollahi Mahdi Cite this article as: Rezaei-Vahidian Hadi, Farajpour Tohid, Abdollahi Mahdi. Using an Inhibitor to Prevent Plasticizer Migration from Polyurethane Matrix to EPDM Based Substrate[J]. Chinese J. Polym. Sci, 2019, 37(7): 681-686. doi: 10.1007/s10118-019-2251-y View online: https://doi.org/10.1007/s10118-019-2251-y Articles you may be interested in Antistatic PVC-graphene Composite through Plasticizer-mediated Exfoliation of Graphite Chinese J. Polym. Sci. 2018, 36(12): 1361 https://doi.org/10.1007/s10118-018-2160-5 SYNTHESIS OF POLYURETHANE MODIFIED BISMALEIMIDE (UBMI) AND POLYURETHANE-IMIDE ELASTOMER Chinese J. Polym. Sci. 2008, 26(1): 117 Synthesis and Properties of Reversible Disulfide Bond-based Self-healing Polyurethane with Triple Shape Memory Properties Chinese J. Polym. Sci. 2019, 37(11): 1119 https://doi.org/10.1007/s10118-019-2268-2 增塑剂对碱木质素/HDPE复合材料性能影响研究 The Effect of Plasticizer on the Properties of Alkali Lignin/HDPE Composites 高分子学报. 2014(2): 210 https://doi.org/10.3724/SP.J.1105.2014.13204 泊肃叶流中环形高分子的迁移行为及与线性高分子的差异 Migration of Ring Polymers in Poiseuille Flow and Comparison with Linear Polymers 高分子学报. 2019, 50(11): 1229 https://doi.org/10.11777/j.issn1000-3304.2019.19074 聚醚硅油表面迁移行为对聚苯乙烯表面极性的影响 THE IMPROVEMENT OF POLARITY OF POLYSTYRENE SURFACE BY THE SELECTIVE SURFACE MIGRATION OF POLYETHER SILICOME OIL 高分子学报. 2007(2): 165 Chinese Journal of POLYMER SCIENCE ARTICLE https://doi.org/10.1007/s10118-019-2251-y