Download or read book Synthesis of Polymers Expected to Have Superconducting Properties written by J. H. Hodgkin and published by . This book was released on 1971 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the research program was the synthesis and evaluation of organic polymers which on theoretical grounds might exhibit superconducting properties at or near room temperature. The report discusses research on the synthesis of a conjugated polymer chain that could be adequately characterized, and then on the attachment of dye molecules, as close as possible to this chain, without allowing cross conjugation. One approach was the synthesis and characterization of Schiffbase polymers with side-chain dye molecules. Considerable effort was devoted to the preparation of low molecular weight model compounds to define reaction conditions necessary for high polymer formation and to provide complete electronic spectra for the computational program. However, when efforts were made to combine the dye molecules and conjugated polymers, steric hindrance prevented the synthesis of the proposed polymers. In a second approach, efforts were made to avoid the problem of steric hindrance by synthesizing modified Schiff-base polymers from 2,5-dihydroxybenzoquinone and various substituted diamines. Polymers were prepared with and without attached dye groups and also as metal complexes; however, electrical testing of these materials indicated that they were insulators. Another approach included the synthesis of a conjugated spine of dehydrogenated poly-9-vinylanthracene with dye precursors attached through chloromethyl groups on the anthracene units. Electrical testing indicated that they were insulators. The final approach tried was the use of poly-4-chloropyridine as the conjugated chain and again the attachment of the dye precursor via a chloromethyl group. (Author).
Download or read book Materials Science and Engineering for the 1990s written by National Research Council and published by National Academies Press. This book was released on 1989-02-01 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials science and engineering (MSE) contributes to our everyday lives by making possible technologies ranging from the automobiles we drive to the lasers our physicians use. Materials Science and Engineering for the 1990s charts the impact of MSE on the private and public sectors and identifies the research that must be conducted to help America remain competitive in the world arena. The authors discuss what current and future resources would be needed to conduct this research, as well as the role that industry, the federal government, and universities should play in this endeavor.
Download or read book Semiconducting Polymers written by Christine Luscombe and published by Royal Society of Chemistry. This book was released on 2016-10-12 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconducting polymers are of great interest for applications in electroluminescent devices, solar cells, batteries and diodes. In recent years vast advances have been made in the area of controlled synthesis of semiconducting polymers, specifically polythiophenes. The book is separated into two main sections, the first will introduce the advances made in polymer synthesis, and the second will focus on the microstructure and property analysis that has been enabled because of the recent advances in synthetic strategies. Edited by one of the leaders in the area of polythiophene synthesis, this new book will bring the field up to date with more recent models for understanding semiconducting polymers. The book will be applicable to materials and polymers chemists in industry and academia from postgraduate level upwards.
Download or read book Gaylor Technical Survey written by and published by . This book was released on 1971-07 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Beyond the Molecular Frontier written by National Research Council and published by National Academies Press. This book was released on 2003-03-19 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry and chemical engineering have changed significantly in the last decade. They have broadened their scopeâ€"into biology, nanotechnology, materials science, computation, and advanced methods of process systems engineering and controlâ€"so much that the programs in most chemistry and chemical engineering departments now barely resemble the classical notion of chemistry. Beyond the Molecular Frontier brings together research, discovery, and invention across the entire spectrum of the chemical sciencesâ€"from fundamental, molecular-level chemistry to large-scale chemical processing technology. This reflects the way the field has evolved, the synergy at universities between research and education in chemistry and chemical engineering, and the way chemists and chemical engineers work together in industry. The astonishing developments in science and engineering during the 20th century have made it possible to dream of new goals that might previously have been considered unthinkable. This book identifies the key opportunities and challenges for the chemical sciences, from basic research to societal needs and from terrorism defense to environmental protection, and it looks at the ways in which chemists and chemical engineers can work together to contribute to an improved future.
Download or read book New Polymeric Materials Expected to Have Superior Properties for Space Based Use written by D. B. Cotts and published by . This book was released on 1985 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The properties of electrically conducting, semiconducting and semiinsulating polymers were surveyed and their conduction mechanism, mechanical properties, and suitability for spacebased use evaluated. Correlations between molecular structure, conductivity, and mechanical properties were drawn, and a comprehensive model of electrical conductivity in organic polymers was formulated. Although the most widely studied electrically conducting polymers are not robust enough for most space-based uses, several commercial materials, including pyrolyzed Kapton and polyvinyl carbazole, appear to have the necessary combination of electrical, thermal, and mechanical properties. The main obstacle to the selection of new or modified materials for spacecraft use is the lack of strength, thermal stability, and radiation resistance--not their conductivity. Several synthesis procedures are identified that would raise the value of these properties to acceptable levels for materials that have the required electrical properties. The wide range of data reported in the literature can be reconciled by a theory of conductivity in which the limiting feature is the rate at which electrons are transferred between localized charges states. Some of the new polymers identified by this model have been prepared. They possess relatively high electrical conductivities and, unlike the majority of electrically conducting polymers, are processable in organic solvents.
Download or read book Semiconducting Polymers written by Taylor & Francis Group and published by Apple Academic Press. This book was released on 2023-01-03 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Semiconducting polymers are of great interest for applications in electroluminescent devices, solar cells, batteries, and diodes. This volume, Semiconducting Polymers: Synthesis and Photophysical Properties, provides a thorough introduction to the basic concepts of the photophysics of semiconducting polymers, as well as a description of the principal polymerization methods for luminescent polymers. Divided into two main sections, the book first introduces the advances made in polymer synthesis, and then goes on to focus on the photophysics aspects, also exploring how new advances in the area of controlled syntheses of semiconducting polymers are applied. An understanding of the photophysics process in this kind of material requires some knowledge of many different terms in this field, so a chapter on the basic aspects is included. The process that occurs in semiconducting polymers spans time scales that are unimaginably fast, sometimes less than a picosecond. To appreciate this extraordinary scale, it is necessary to learn a range of vocabularies and concepts that stretch from the basic concepts of photophysics to modern applications, such as electroluminescent devices, solar cells, batteries, and diodes. This book provides a starting point for a broadly based understanding of photophysics concepts applied in understanding semiconducting polymers, incorporating critical ideas from across the scientific spectrum. The book is intended for graduate students in a range of disciplines. It will also prove valuable for faculty and instructors, and scientists and researchers in chemistry, physics, and engineering"--
Download or read book Kirk Othmer Concise Encyclopedia of Chemical Technology 2 Volume Set written by Kirk-Othmer and published by John Wiley & Sons. This book was released on 2007-07-16 with total page 2762 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book A Forecast of Space Technology 1980 2000 written by and published by . This book was released on 1976 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Forecast of Space Technology 1980 2000 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Office and published by . This book was released on 1976 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conducting Polymers written by Luiz Carlos Almeida and published by Nova Science Publishers. This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, written by leading experts of the international scientific community, is divided into 10 chapters and gives a comprehensive review of the important aspects of conducting polymers. Synthetic methodologies of these polymers and their nanocomposites along with their electrical and electrochemical properties are described herein. Application of the conducting polymers for sensors, solar cells and lithium batteries are also presented. The editor and all contributors believe the subjects highlighted are important topics in the field of conducting polymers and make this book a very useful scientific support to a large audience of readers, from students to senior researchers in the academic community and from engineers to business people in different industrial sectors.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book SYNTHESIS OF CONJUGATED POLYMERS VIA RANDOM COPOLYMERIZATION TO INVESTIGATE THERMAL PROPERTIES written by Michael Gill and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The utility of conjugated polymers stems from their wide uses in organic photovoltaics, organic field-effect transistors, and organic light-emitting diodes. One of the advantages of conjugated polymers over traditional silicon-based electronics is their chemical tunability. Conjugated polymers can be customized to have desirable properties based on their intended application. These polymers have been studied to understand how changes to their structure affect electronic properties, including analysis of their glass transition and melting transition; however, these models have not been extensively studied. In this study, two polymers, Poly-((2,5- dihexylphenylene)-1,4-diyl-alt-[4,7-bis(thiophen-5-yl)-2,1,3-benzothiadiazole]-2,2"-diyl) (PPTBT) and Poly-((9,9-bis(2-octyl)-fluorene-2,7-diyl)-alt-(4,7-di(thiophene-2-yl)-2,1,3-benzothiadiazole)-5,5-diyl) (PFTBT) were synthesized with varying concentrations of 4,7-bis(5-bromo-4-hexylthiophen-2-yl)-2,1,3-benzothiadiazole (T6BT). This was done to analyze how the random addition of T6BT affects the physical macroscopic properties of the polymers including crystallinity and the phase transition temperatures. Addition of T6BT was expected to improve the solubility of the polymer during processing with minimal impact on thermal properties. Thermal analysis was conducted using Differential Scanning Calorimetry. Poly-((2,5-dihexylphenylene)-1,4-diyl-alt-[4,7-bis(3-hexylthiophen-5-yl)-2,1,3-benzothiadiazole]-2,2-diyl) or PPT6BT demonstrated a liquid crystallinity with a nematic to isotropic transition at 146C while no other polymers demonstrated substantial crystallinity or liquid crystalline properties.
Download or read book A Guide To Chalcogen nitrogen Chemistry written by Tristram Chivers and published by World Scientific. This book was released on 2005-01-03 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chalcogen-nitrogen chemistry involves the study of compounds that exhibit a linkage between nitrogen and sulfur, selenium or tellurium atoms. Such studies have both fundamental and practical importance. A Guide to Chalcogen-Nitrogen Chemistry examines the role of chalcogen-nitrogen compounds in areas ranging from solid-state inorganic chemistry to biochemistry. The discussion covers fundamental questions concerning the bonding in electron-rich systems, as well as potential practical applications of polymers and materials with novel magnetic or electrical properties. This book is the only account of this important topic to appear in the last twenty-five years, and coupled with its extensive literature coverage of very recent developments, this comprehensive guide is essential for anyone working in the field. The treatment is unique in providing a comparison of sulfur, selenium and tellurium systems, with an approach intended to emphasize general concepts that will be helpful to the non-specialist. Each chapter is designed to be self-contained, and there are extensive cross-references between chapters.
Download or read book Carraher s Polymer Chemistry written by Charles E. Carraher Jr. and published by CRC Press. This book was released on 2017-10-12 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carraher's Polymer Chemistry, Tenth Edition integrates the core areas of polymer science. Along with updating of each chapter, newly added content reflects the growing applications in Biochemistry, Biomaterials, and Sustainable Industries. Providing a user-friendly approach to the world of polymeric materials, the book allows students to integrate their chemical knowledge and establish a connection between fundamental and applied chemical information. It contains all of the elements of an introductory text with synthesis, property, application, and characterization. Special sections in each chapter contain definitions, learning objectives, questions, case studies and additional reading.
Download or read book Government Reports Announcements written by and published by . This book was released on 1971 with total page 1692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Materials and Processing written by Federal Coordinating Council for Science, Engineering, and Technology. Committee on Industry and Technology and published by . This book was released on 1992 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
