Applications Of N Heterocycles In Electrically And Ionically Conductive Polymers
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Applications Of N Heterocycles In Electrically And Ionically Conductive Polymers
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Author : Brent Carl Norris
language : en
Publisher:
Release Date : 2010
Applications Of N Heterocycles In Electrically And Ionically Conductive Polymers written by Brent Carl Norris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The covalent bond formed between a N-heterocyclic carbene and an aryl-isothiocyanate was discovered to be thermally-reversible. This bond was incorporated into the backbone of an aromatic polymer which, when subjected to heat and excess monomer, would depolymerize to smaller oligomers. In addition these small molecules contain active chain ends and could be repolymerized to reform the original polymer. The high molecular weight material was made into freestanding sheets with desirable mechanical properties and could be made conductive by treatment with iodine. A new poly(triazene) was formed from the reaction of a facially opposed, annulated, bis-N-heterocyclic carbene (NHC) and an organic bis-azide. The NHC as well as the azide were varied and combined to produce a series of polymers which were characterized by GPC, TGA, and NMR. These thermally robust polymers were also coated onto glass slides and rendered electrically conductive by exposure to iodine vapor. A new reagent for Reversible Addition Fragmentation Chain Transfer Polymerization (RAFT) is described. This imidazolium based reagent shows unusually fast kinetics which allows it to control polymerizations at significantly reduced loadings compared to the more traditional neutral dithiocarbamates or dithioesters. The fast kinetics is explained by the rapid rotation of the dithioester about the plane of the cationic N-heterocycle. Sulfonated poly(ether ether ketone) (sPEEK) membranes were blended with imidazoles with varying pKas. The proton conductivity of the membranes was evaluated as a function of pKa and temperature. Interestingly, the conductivity of the dry membranes showed a non-monotonous profile over a temperature range of 25 - 150 °C. We use a theoretical model to better understand the mechanistic origins of the observed temperature-conductivity profiles. This model is based on the reaction equilibria between sPEEK's sulfonic acid groups and the basic sites of the added heterocycles. Using the copper-catalyzed 1,3-dipolar "click" cycloaddition reaction, poly(sulfone)s containing pendant azide moieties were functionalized with various amounts of sodium 3-(prop-2-ynyloxy)propane-1-sulfonate and crosslinked with 1,7-octadiyne. The degree of sulfonation as well as the degree of cross-linking was systematically varied by changing the ratios of the aforementioned reagents. The polymers were cast into membranes, acidified, and then tested for proton conductivity, methanol permeability, and membrane-electrode assembly (MEA) performance.
Conducting Polymers
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Author : Luis Alcácer
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Conducting Polymers written by Luis Alcácer and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The development and the study of both ionic and electronically conducting polymers have been. in the past few years. areas of· increasing interest. These new materials are. in fact. being considered for many technological applications. namely low weight. high energy density batteries and sensors. This volume contains the proceedings of a workshop on this subject. sponsored by the U.S. Army Research. Development and Standardization Group (U.K.). which took place in Sintra - Portugal from July 27 to July 31. 1986. The workshop. which included lectures. communications and discussion panels. was very sucessfull and the combination of ionic with electronically conducting polymers and their applications. not usually together in workshops or conferences. proved to be an excellent idea. Lisbon December. 1986 Luis Alcacer ix THE ELECTROCHEMISTRY OF ELECTRONICALLY CONDUCTING POLYMERS J. O'M. Bockris and David Miller Department of Chemistry Texas A&M University College Station, Texas 77843 USA ABSTRACT. The new field of the electrochemistry of electronically conducting polymers is reviewed. A brief historical account traces the beginning of organic electrodes to Ka11mann and Pope, who, in 1960, observed charge injection and conductance in anthracene electrodes.
Conductive Polymers Ii
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Author : R. H. Friend
language : en
Publisher: iSmithers Rapra Publishing
Release Date : 1993
Conductive Polymers Ii written by R. H. Friend and has been published by iSmithers Rapra Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Technology & Engineering categories.
This report explains the theory of polymer conductivity, and discusses developments in the synthesis of the major polymers. A detailed section on practical applications follows a discussion of the improved electrical and mechanical properties and environmental stability which make such applications possible. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database provides useful references for further reading.
New Polymers For Special Applications
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Author : Ailton De Souza Gomes
language : en
Publisher: BoD – Books on Demand
Release Date : 2012-09-12
New Polymers For Special Applications written by Ailton De Souza Gomes and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-12 with Science categories.
This book comprises the contributions of several authors in the area of polymer physics by application of conducting polymers; hydrogel films on optical fiber core; thin film polymers; PDLC films application; photopolymers for holographic media; microwave absorption and EMI shielding behavior of nanocomposites based on intrinsically conducting polymers and graphene and carbon nanotubes; in the area of polymer synthesis of conducting polymers; oxidative polymerization of aniline; electro reductive polymerization; polysilanes with ordered sequences; radiation cross-linking poly(urethane-imide) and nitrogen-rich polymers as candidates for energetic applications; development of ruthenium complexes to novel functional nanocomposites. We hope that this book will help inspire readers to pursue study and research in this field.
Electrical And Optical Polymer Systems
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Author : Donald L. Wise
language : en
Publisher: CRC Press
Release Date : 1998-03-27
Electrical And Optical Polymer Systems written by Donald L. Wise and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-03-27 with Science categories.
"Offers background information, methods of characterization, and applications for electrical and optical polymers, including biopolymers, and tutorial sections that explain how to use the techniques."
Green Chemistry Synthesis Of Bioactive Heterocycles
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Author : K. L. Ameta
language : en
Publisher: Springer
Release Date : 2014-06-17
Green Chemistry Synthesis Of Bioactive Heterocycles written by K. L. Ameta and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-17 with Science categories.
The book presents a succinct summary of methods for the synthesis and biological activities of various different-sized bioactive heterocycles using different green chemistry synthetic methodologies, like microwave, ultrasonic, water mediated, ionic liquids, etc. The book also provides an insight of how green chemistry techniques are specific to the bioactive heterocyclic compounds.
Sulfur Acids Advances In Research And Application 2013 Edition
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Author :
language : en
Publisher: ScholarlyEditions
Release Date : 2013-05-01
Sulfur Acids Advances In Research And Application 2013 Edition written by and has been published by ScholarlyEditions this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-01 with Science categories.
Sulfur Acids—Advances in Research and Application: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Sulfinic Acids. The editors have built Sulfur Acids—Advances in Research and Application: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Sulfinic Acids in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Sulfur Acids—Advances in Research and Application: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1993
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Physics categories.
Kirk Othmer Concise Encyclopedia Of Chemical Technology 2 Volume Set
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Author : Kirk-Othmer
language : en
Publisher: John Wiley & Sons
Release Date : 2007-07-16
Kirk Othmer Concise Encyclopedia Of Chemical Technology 2 Volume Set written by Kirk-Othmer and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-07-16 with Science categories.
This is an easily-accessible two-volume encyclopedia summarizing all the articles in the main volumes Kirk-Othmer Encyclopedia of Chemical Technology, Fifth Edition organized alphabetically. Written by prominent scholars from industry, academia, and research institutions, the Encyclopedia presents a wide scope of articles on chemical substances, properties, manufacturing, and uses; on industrial processes, unit operations in chemical engineering; and on fundamentals and scientific subjects related to the field.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2007
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Dissertations, Academic categories.