Polymer Chemistry. an Activity-Oriented Instructional Module
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1 Fundamentals of Polymer Chemistry
1 Fundamentals of Polymer Chemistry H. Warson 1 THE CONCEPT OF A POLYMER 1.1 Historical introduction The differences between the properties of crystalline organic materials of low molecular weight and the more indefinable class of materials referred to by Graham in 1861 as ‘colloids’ has long engaged the attention of chemists. This class includes natural substances such as gum acacia, which in solution are unable to pass through a semi-permeable membrane. Rubber is also included among this class of material. The idea that the distinguishing feature of colloids was that they had a much higher molecular weight than crystalline substances came fairly slowly. Until the work of Raoult, who developed the cryoscopic method of estimating molecular weight, and Van’t Hoff, who enunciated the solution laws, it was difficult to estimate even approximately the polymeric state of materials. It also seems that in the nineteenth century there was little idea that a colloid could consist, not of a product of fixed molecular weight, but of molecules of a broad band of molecular weights with essentially the same repeat units in each. Vague ideas of partial valence unfortunately derived from inorganic chem- istry and a preoccupation with the idea of ring formation persisted until after 1920. In addition chemists did not realise that a process such as ozonisation virtually destroyed a polymer as such, and the molecular weight of the ozonide, for example of rubber, had no bearing on the original molecular weight. The theory that polymers are built up of chain formulae was vigorously advocated by Staudinger from 1920 onwards [1]. -
BLUE HEN CHEMIST University of Delaware, Department of Chemistry and Biochemistry Annual Alumni Newsletter Number 41 August 2014 John L
BLUE HEN CHEMIST University of Delaware, Department of Chemistry and Biochemistry Annual Alumni Newsletter NUMBER 41 AUGUST 2014 JOHN L. BURMEISTER, EDITOR ON THE COVER THREE Newly Renovated Organic Laboratories! # 3 8 - P AGE I BLU E H E N C H E MIST ON THE COVER One of the three newly-renovated Organic Chemistry teaching laboratories (QDH 302) is shown. Work on the labs (QDH 112, 318, 320) started on May, 2013 and was completed in February of this year. The refurbishment of the labs was a crucial step in the ongoing revision of the Organic Chemistry laboratory curricula. The additional fume hoods allow each student to conduct experiments individually while minimizing their exposure to chemical reagents. The transparent glass construction helps teaching assistants observe students while they work. The hoods are equipped with inert-gas lines, which can allow the students to work with air-sensitive compounds and learn advanced laboratory techniques. The hoods are also equipped with vacuum lines, which obviate the need for water aspirators and dramatically reduce the labs' water usage. The lab design also allows for instrumentation modules to be swapped in and out according to the needs of the experiment. Carts are designed to house instruments such as gas chromatographs and infrared spectrometers as well as any necessary computer equipment. These carts can then be wheeled into docking areas that have been fitted with the necessary inert gas and electrical lines. The design expands the range of possible instrumentation the students can use while occupying a small footprint of lab space. The labs also feature large flat screen monitors, wireless internet, and computer connectivitiy that will enable the use of multimedia demonstrations and tablet computing. -
LIBRARY. This Thesis Has Been Approved for the Department of Chemical Engineering and the College of Engineering and Technology
~.. STUDY OF A COUNTER-ROTATING, INTERMESHING EXTRUDER AS A POLYCONDENSATION REACTOR /" A Thesis Presented to the Faculty of The College of Engineering and Technology Ohio University In Partial Fulfilment of the Requirements for the Degree Master of Science by Edward R. Crowe November, 1992 LIBRARY. This Thesis has been approved for the Department of Chemical Engineering and the College of Engineering and Technology Associate Prof Chem1cal Engineering Dean of the College of Engineering and Technology iii Abstract An experimental study and model development have been performed to better understand the reactive extrusion of polyethylene terephthalate. A process was developed using a 34 mm counter-rotating twin screw extruder to depolymerize a commercial grade of polyethylene terephthalate into an acceptable pre-polymer for reactive extrusion experiments. Residence time d Ls'tr Ibut.Lon experiments were conducted at different screw speeds and feed rates to characterize the flow patterns of the extruder. Based on these results an idealized plug-flow model was developed to simulate this process. An experimental design using the controllable process variables of zone temperature, feed rate and nitrogen flow sweeping across the surface of the polymer melt was developed to stUdy the individual effects of each of these variables as well as any interactive effects. The results indicate that the feed rate and nitrogen flow have an effect on the degree of polymerization of the product. However, the stUdy clearly shows the dominant effect to be ,the average residence time of the polymer melt in the vent zone. The idealized plug-flow model presents a reasonable representation of this process. -
HDPE: High Density Polyethylene LDPE
Abbreviations: HDPE: high density polyethylene LDPE: low density polyethylene PET: polyethylene terephthalate PP: polypropylene PS: polystyrene PVA: polyvinyl alcohol PVC: polyvinyl chloride addition polymerization: a chemical reaction in which simple molecules are linked together to form long chain molecules. amorphous: non-crystalline polymer or non-crystalline areas in a polymer. Bakelite: a polymer produced by the condensation of phenol and formaldehyde. branched polymer: polymer having smaller chains attached to the polymer backbone. cellulose: a natmal polymer found in wood and other plant material. composite polymer: a filled or reinforced plastic. condensation polymer: one in which two or more molecules combine resulting in elimination of water or other simple molecules, with the process being repeated to form a long chain molecule. configuration: related chemical structme produced by the making and breaking ofprimary valence bonds. copolymer: a macromolecule consisting of more than one type of building unit. creep: cold flow of a polymer. cross-linking: occms when primary valence bonds are formed between separate polymer molecules. crystalline polymer: polymer with a regular order or pattern of molecular arrangement and a sharp melting point. dimer: a polymer containing two monomers. domains: sequences or regions in block copolymers. elastomer: a type of polymer that exhibits rubber-like qualities. Ekonol: a moldable, high temperatme polymer. end group: functional group at the end of a chain in polymers, e.g. carboxylic group. extrusion: a fabrication process in which a heat-softened polymer is forced continually by a screw through a die. filler: a relatively inert material used as the discontinuous phase of a polymer composite. free radical: A chemical component that contains a free electron which covalently bonds with a free electron on another molecule. -
Synthesis of Functionalized Polyamide 6 by Anionic Ring-Opening Polymerization Deniz Tunc
Synthesis of functionalized polyamide 6 by anionic ring-opening polymerization Deniz Tunc To cite this version: Deniz Tunc. Synthesis of functionalized polyamide 6 by anionic ring-opening polymerization. Poly- mers. Université de Bordeaux; Université de Liège, 2014. English. NNT : 2014BORD0178. tel- 01281327 HAL Id: tel-01281327 https://tel.archives-ouvertes.fr/tel-01281327 Submitted on 2 Mar 2016 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Logo Université de cotutelle THÈSE PRÉSENTÉE POUR OBTENIR LE GRADE DE DOCTEUR DE L’UNIVERSITÉ DE BORDEAUX ET DE L’UNIVERSITÉ DE LIEGE ÉCOLE DOCTORALEDE SCIENCES CHIMIQUES (Université de Bordeaux) ÉCOLE DOCTORALE DE CHIMIE (Université de Liège) SPÉCIALITÉ POLYMERES Par Deniz TUNC Synthesis of functionalized polyamide 6 by anionic ring-opening polymerization Sous la direction de Stéphane CARLOTTI et Philippe LECOMTE Soutenue le 30 octobre 2014 Membres du jury: M. PERUCH, Frédéric Directeur de recherche, Université de Bordeaux Président M. HOOGENBOOM, Richard Professeur, Ghent University Rapporteur M. MONTEIL, Vincent Chargé de recherche, Université Claude Bernard Rapporteur M. YAGCI, Yusuf Professeur, Istanbul Technical University Examinateur M. AMEDURI, Bruno Directeur de recherche, Institut Charles Gerhardt Examinateur M. SERVANT, Laurent Professeur, Université de Bordeaux Invité Preamble This PhD had been performed within the framework of the IDS FunMat joint doctoral programme. -
Origins of Life: Transition from Geochemistry to Biogeochemistry
December 2016 Volume 12, Number 6 ISSN 1811-5209 Origins of Life: Transition from Geochemistry to Biogeochemistry NITA SAHAI and HUSSEIN KADDOUR, Guest Editors Transition from Geochemistry to Biogeochemistry Staging Life: Warm Seltzer Ocean Incubating Life: Prebiotic Sources Foundation Stones to Life Prebiotic Metal-Organic Catalysts Protometabolism and Early Protocells pub_elements_oct16_1300&icpms_Mise en page 1 13-Sep-16 3:39 PM Page 1 Reproducibility High Resolution igh spatial H Resolution High mass The New Generation Ion Microprobe for Path-breaking Advances in Geoscience U-Pb dating in 91500 zircon, RF-plasma O- source Addressing the growing demand for small scale, high resolution, in situ isotopic measurements at high precision and productivity, CAMECA introduces the IMS 1300-HR³, successor of the internationally acclaimed IMS 1280-HR, and KLEORA which is derived from the IMS 1300-HR³ and is fully optimized for advanced U-Th-Pb mineral dating. • New high brightness RF-plasma ion source greatly improving spatial resolution, reproducibility and throughput • New automated sample loading system with motorized sample height adjustment, significantly increasing analysis precision, ease-of-use and productivity • New UV-light microscope for enhanced optical image resolution (developed by University of Wisconsin, USA) ... and more! Visit www.cameca.com or email [email protected] to request IMS 1300-HR³ and KLEORA product brochures. Laser-Ablation ICP-MS ~ now with CAMECA ~ The Attom ES provides speed and sensitivity optimized for the most demanding LA-ICP-MS applications. Corr. Pb 207-206 - U (238) Recent advances in laser ablation technology have improved signal 2SE error per sample - Pb (206) Combined samples 0.076121 +/- 0.002345 - Pb (207) to background ratios and washout times. -
Polymer Exemption Guidance Manual POLYMER EXEMPTION GUIDANCE MANUAL
United States Office of Pollution EPA 744-B-97-001 Environmental Protection Prevention and Toxics June 1997 Agency (7406) Polymer Exemption Guidance Manual POLYMER EXEMPTION GUIDANCE MANUAL 5/22/97 A technical manual to accompany, but not supersede the "Premanufacture Notification Exemptions; Revisions of Exemptions for Polymers; Final Rule" found at 40 CFR Part 723, (60) FR 16316-16336, published Wednesday, March 29, 1995 Environmental Protection Agency Office of Pollution Prevention and Toxics 401 M St., SW., Washington, DC 20460-0001 Copies of this document are available through the TSCA Assistance Information Service at (202) 554-1404 or by faxing requests to (202) 554-5603. TABLE OF CONTENTS LIST OF EQUATIONS............................ ii LIST OF FIGURES............................. ii LIST OF TABLES ............................. ii 1. INTRODUCTION ............................ 1 2. HISTORY............................... 2 3. DEFINITIONS............................. 3 4. ELIGIBILITY REQUIREMENTS ...................... 4 4.1. MEETING THE DEFINITION OF A POLYMER AT 40 CFR §723.250(b)... 5 4.2. SUBSTANCES EXCLUDED FROM THE EXEMPTION AT 40 CFR §723.250(d) . 7 4.2.1. EXCLUSIONS FOR CATIONIC AND POTENTIALLY CATIONIC POLYMERS ....................... 8 4.2.1.1. CATIONIC POLYMERS NOT EXCLUDED FROM EXEMPTION 8 4.2.2. EXCLUSIONS FOR ELEMENTAL CRITERIA........... 9 4.2.3. EXCLUSIONS FOR DEGRADABLE OR UNSTABLE POLYMERS .... 9 4.2.4. EXCLUSIONS BY REACTANTS................ 9 4.2.5. EXCLUSIONS FOR WATER-ABSORBING POLYMERS........ 10 4.3. CATEGORIES WHICH ARE NO LONGER EXCLUDED FROM EXEMPTION .... 10 4.4. MEETING EXEMPTION CRITERIA AT 40 CFR §723.250(e) ....... 10 4.4.1. THE (e)(1) EXEMPTION CRITERIA............. 10 4.4.1.1. LOW-CONCERN FUNCTIONAL GROUPS AND THE (e)(1) EXEMPTION................. -
Exploring the Influence of Entropy on Dynamic Macromolecular Ligation
Exploring the Influence of Entropy on Dynamic Macromolecular Ligation Zur Erlangung des akademischen Grades eines DOKTORS DER NATURWISSENSCHAFTEN (Dr. rer. nat.) der KIT-Fakultät für Chemie und Biowissenschaften des Karlsruher Instituts für Technologie (KIT) genehmigte DISSERTATION von Dipl.-Chem. Kai Pahnke aus Nagold, Deutschland KIT-Dekan: Prof. Dr. Willem M. Klopper Referent: Prof. Dr. Christopher Barner-Kowollik Korreferent: Prof. Dr. Manfred Wilhelm Tag der mündlichen Prüfung: 22.07.2016 Die vorliegende Arbeite wurde im Zeitraum von Februar 2013 bis Juni 2016 im Rahmen einer Kollaboration zwischen dem KIT und der Evonik Industries AG unter der Betreuung von Prof. Dr. Christopher Barner-Kowollik durchgeführt Only entropy comes easy. Anton Chekhov ABSTRACT The present thesis reports a novel, expedient linker species as well as previously unforeseen effects of physical molecular parameters on reaction entropy and thus equilibria with extensive implications on diverse fields of research via the study of dynamic ligation chemistries, especially in the realm of macromolecular chemistry. A set of experiments investigating the influence of different physical molecular parameters on reaction or association equilibria is designed. Initially, previous findings of a mass dependant effect on the reaction entropy – resulting in a more pronounced debonding of heavier or longer species – are reproduced and expanded to other dynamic ligation techniques as well as further characterization methods, now including a rapid and catalyst- free Diels–Alder reaction. The effects are evidenced via high temperature nuclear magnetic resonance spectroscopy (HT NMR) as well as temperature dependent size exclusion chromatography (TD SEC) and verified via quantum chemical ab initio calculations. Next, the impact of chain mobility on entropic reaction parameters and thus the overall bonding behavior is explored via the thermoreversible ligation of chains of similar mass and length, comprising isomeric butyl side-chain substituents with differing steric demands. -
Polymers: a Historical Perspective
Journal & Proceedings of the Royal Society of New South Wales, vol. 152, part 2, 2019, pp. 242–250. ISSN 0035-9173/19/020242-09 Polymers: a historical perspective Robert Burford, FRSN Emeritus Professor, School of Chemical Engineering, UNSW Sydney Email: [email protected] Abstract This commissioned paper outlines the emergence of new forms of synthetics and plastics as our under- standing of polymer chemistry has advanced. Synopsis phenols and styrene are “polymerised” to olymers have been ubiquitous since form thermosets,1 including phenol for- simple gaseous molecules began to form maldehyde “Bakelite” thermosets, but are P 2 life-giving organic structures many millions also present in thermoplastics including of years ago. Today, we rely upon proteins polystyrene and related materials such as comprising twenty amino acids, as well as styrene acrylonitrile (SAN) and ABS.3 The DNA and RNA with many fewer nucleic manufacture of Bakelite is often viewed as acids. Similarly, many fibres and plants the birth of the synthetic polymer industry. comprise carbohydrate polymers: we and The enormous growth both in diversity and other animals use these and protein-based volume of thermoplastics is a feature of the polymers for our diet. Hence, organic earth’s 20th century, dismissively called the “plastics surface has an enormous diversity of natu- age.” Again, important but sometimes ser- rally occurring polymers, sometimes called endipitous discoveries are a feature of this macromolecules. period, but the associated large-scale produc- Today, these continue to feed and clothe tion introduced multinational corporations us, and much more, but the beginning of originating mainly in Europe, the US and man-made materials might be considered Japan. -
Breaking the Barriers of All-Polymer Solar Cells: Solving Electron Transporter and Morphology Problems
University of Massachusetts Amherst ScholarWorks@UMass Amherst Open Access Dissertations 9-2012 Breaking the Barriers of All-Polymer Solar Cells: Solving Electron Transporter And Morphology Problems Nagarjuna Gavvalapalli University of Massachusetts Amherst, [email protected] Follow this and additional works at: https://scholarworks.umass.edu/open_access_dissertations Part of the Chemistry Commons Recommended Citation Gavvalapalli, Nagarjuna, "Breaking the Barriers of All-Polymer Solar Cells: Solving Electron Transporter And Morphology Problems" (2012). Open Access Dissertations. 608. https://doi.org/10.7275/xp7e-nb11 https://scholarworks.umass.edu/open_access_dissertations/608 This Open Access Dissertation is brought to you for free and open access by ScholarWorks@UMass Amherst. It has been accepted for inclusion in Open Access Dissertations by an authorized administrator of ScholarWorks@UMass Amherst. For more information, please contact [email protected]. BREAKING THE BARRIERS OF ALL-POLYMER SOLAR CELLS: SOLVING ELECTRON TRANSPORTER AND MORPHOLOGY PROBLEMS A Dissertation Presented by NAGARJUNA GAVVALAPALLI Submitted to the Graduate School of the University of Massachusetts Amherst in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY September 2012 Chemistry © Copyright by Nagarjuna Gavvalapalli 2012 All Rights Reserved BREAKING THE BARRIERS OF ALL-POLYMER SOLAR CELLS: SOLVING ELECTRON TRANSPORTER AND MORPHOLOGY PROBLEMS A Dissertation Presented by NAGARJUNA GAVVALAPALLI Approved as to style -
CHEMISTRY TECHNIQUES a Dissertation Presented to the Graduate Faculty Of
PREPARING POLYMERIC BIOMATERIALS USING “CLICK” CHEMISTRY TECHNIQUES A Dissertation Presented to The Graduate Faculty of The University of Akron In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy Fei Lin May, 2014 PREPARING POLYMERIC BIOMATERIALS USING “CLICK” CHEMISTRY TECHNIQUES Fei Lin Dissertation Approved: Accepted: ______________________ _______________________ Advisor Department Chair Dr. Matthew L. Becker Dr. Coleen Pugh ______________________ _______________________ Committee Member Dean of the College Dr. Abraham Joy Dr. Stephen Z. D. Cheng ______________________ _______________________ Committee Member Dean of the Graduate School Dr. Chrys Wesdemiotis Dr. George R. Newkome ______________________ _______________________ Committee Member Date Dr. Shi-Qing Wang ______________________ Committee Member Dr. Robert A. Weiss ii ABSTRACT Significant efforts have been focused on preparing degradable polymeric biomaterials with controllable properties, which have the potential to stimulate specific cellular responses at the molecular level. “Click” reactions provide a universal tool box to achieve that goal through molecular level design and modification. This dissertation demonstrates multiple methodologies and techniques to develop advanced biomaterials through combining degradable polymers and “click” chemistry. In my initial work, a novel class of amino acid-based poly(ester urea)s (PEU) materials was designed and prepared for potential applications in bone defect treatment. PEUs were synthesized via interfacial polycondensation, and showed degradability in vivo and possessed mechanical strength superior to conventionally used polyesters. Further mechanical enhancement was achieved after covalent crosslinking with a short peptide crosslinker derived from osteogenic growth peptide (OGP). The in vitro and in an in vivo subcutaneous rat model demonstrated that the OGP-based crosslinkers promoted proliferative activity of cells and accelerated degradation properties of PEUs. -
Polymer Chemistry Degree Requirements Faculty Bachelor of Science Degree Petar R
Polymer Chemistry Degree requirements Faculty Bachelor of Science Degree Petar R. Dvornic, Ph.D., in Polymer Chemistry** Chair, Professor of Chemistry CORE SCIENCE COURSES (36 HOURS) CHEM-215: General Chemistry I (3 hours) Ram Gupta, Ph.D., and CHEM-216: General Chemistry I Lab (2 hours) Assistant Professor of Chemistry Pittsburg State University CHEM-225: General Chemistry II (3hours) and CHEM-226: General Chemistry II Lab (2 hours) Santimukul Santra, Ph.D., CHEM-235: Laboratory Safety & Compliance (1 hour) CHEM-325: Organic Chemistry I (3 hours) Assistant Professor of Chemistry and CHEM-326: Organic Chemistry Lab (2 hours) Jeanne Norton, Ph.D., Polymer CHEM-335: Organic Chemistry II (3 hours) and CHEM-336: Organic Chemistry II Lab (2 hours) Assistant Professor of MATH-150: Calculus I (5 hours) Plastics Engineering Technology PHYS-104: Engineering Physics I (4 hours) and PHYS-130: Elementary Physics Lab I (1 hour) Charles (Jody) Neef, Ph.D., Chemistry PHYS-105: Engineering Physics II (4 hours) Assistant Professor of Chemistry and PHYS-132: Engineering Physics Lab II (1 hour) POLYMER CHEMISTRY CORE COURSES (22-24 HOURS) Paul Herring, CHEM-360: Intro to Polymer Science & Technology (3 hours) Associate Professor of CHEM-611: Senior Review & Assessment (1 hour) CHEM-625: Polymer Synthesis & Characterizations (3 hours) Plastics Engineering Technology and CHEM-626: Polymer Synthesis & Characterizations Laboratory (2 hours) Bob Susnik, CHEM-680: Physical Properties of Polymers (3 hours) Professor of Plastics Engineering Technology CHEM-681: