Synthesis And Characterization Of Oligomers

Author : Constantin V. Uglea
Publisher : CRC Press
ISBN 13 : 9780849349546
Total Pages : 388 pages
Book Rating : 4.40/5 ( download)

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Download or read book Synthesis and Characterization of Oligomers written by Constantin V. Uglea and published by CRC Press. This book was released on 1991-07-24 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an excellent introduction to the fundamentals of oligomer chemistry. Each section describes the synthesis, separation, physico-chemical characterization, and present and future applications of individual classes of oligomers organized according to the chemical structure of the main chain. In addition, this book features up-to-date references from both journals and patents and an extensive appendix covering synthesis and characterization methods of oligomeric derivatives. Synthesis and Characterization of Oligomers is a broad, state-of-the-art survey and will be useful not only for students and professionals working with oligomers, but also chemists who are new to the field.

Author : Susan T. Pasco
Publisher :
ISBN 13 :
Total Pages : 390 pages
Book Rating : 4.52/5 ( download)

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Download or read book Synthesis and Characterization of Substituted Polyphenylene Oligomers written by Susan T. Pasco and published by . This book was released on 1997 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Alice C. Chang
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.51/5 ( download)

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Download or read book Synthesis and Characterization of Modified Phenylethynyl Terminated Polyimides written by Alice C. Chang and published by . This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: As an ongoing effort to develop structural adhesives for high performance aerospace applications, recent work has focused on phenylethynl terminated imide (PETI) oligomers. The work reported herein involves the synthesis and characterization of a series of phenylethynyl containing oligomers designated as LaRC [trademark]MPEI (Modified Phenylethynyl Terminated Polymide). These oligomers contain mixtures of linear, branched and star-shaped molecules. The fully imidized polymers exhibited minimum melt viscosity as low as 600 poise at 335 degrees C. Ti/Ti lap shear specimens processed at 288 degrees C under 15 psi showed tensile shear strength of approx. 6000 psi and 5200 psi at ambient and 350 degrees F temperatures, respectively. The chemistry and properties of these new MPEIs are presented and compared to an optimized linear PETI, LaRC [trademark]-PETI-5.

Author : Olagoke Olabis
Publisher : Elsevier
ISBN 13 : 0323153070
Total Pages : 383 pages
Book Rating : 4.72/5 ( download)

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Download or read book Polymer-Polymer Miscibility written by Olagoke Olabis and published by Elsevier. This book was released on 2012-12-02 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer–Polymer Miscibility discusses miscibility of polymeric mixtures. This book explains the theoretical and practical aspects of polymer miscibility, which has become a considerable area of research in many academic and industrial laboratories. Comprised of seven chapters, this book starts with an overview of the physical nature of the variations of the basic polymer structure. This monograph then discusses the two cases of miscible polymer blends, namely, poly(vinyl chloride) (PVC)–butadiene/acrylonitrile copolymer (NBR) and polystyrene–poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) blends. This text explores the useful and unique properties of blends of poly(vinyl chloride) and butadiene/acrylonitrile copolymer rubber. Other chapters discuss the thermodynamic theories for the phase separation of block copolymers. The reader is also introduced to other variations of chemical structure, which can result in the permanent attachment of polymers to each other through block and graft copolymers. This text also explores the feasibility of covalent bonding of polymer components. This book is intended for chemical engineers and materials scientists.

Author : Mohamed Naceur Belgacem
Publisher : Elsevier
ISBN 13 : 9780080560519
Total Pages : 560 pages
Book Rating : 4.12/5 ( download)

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Download or read book Monomers, Polymers and Composites from Renewable Resources written by Mohamed Naceur Belgacem and published by Elsevier. This book was released on 2011-10-10 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: The progressive dwindling of fossil resources, coupled with the drastic increase in oil prices, have sparked a feverish activity in search of alternatives based on renewable resources for the production of energy. Given the predominance of petroleum- and carbon-based chemistry for the manufacture of organic chemical commodities, a similar preoccupation has recently generated numerous initiatives aimed at replacing these fossil sources with renewable counterparts. In particular, major efforts are being conducted in the field of polymer science and technology to prepare macromolecular materials based on renewable resources. The concept of the bio-refinery, viz. the rational exploitation of the vegetable biomass in terms of the separation of its components and their utilisation as such, or after suitable chemical modifications, is thus gaining momentum and considerable financial backing from both the public and private sectors. This collection of chapters, each one written by internationally recognised experts in the corresponding field, covers in a comprehensive fashion all the major aspects related to the synthesis, characterization and properties of macromolecular materials prepared using renewable resources as such, or after appropriate modifications. Thus, monomers such as terpenes and furans, oligomers like rosin and tannins, and polymers ranging from cellulose to proteins and including macromolecules synthesized by microbes, are discussed with the purpose of showing the extraordinary variety of materials that can be prepared from their intelligent exploitation. Particular emphasis has been placed on recent advances and imminent perspectives, given the incessantly growing interest that this area is experiencing in both the scientific and technological realms. Discusses bio-refining with explicit application to materials Replete with examples of applications of the concept of sustainable development Presents an impressive variety of novel macromolecular materials

Author : Jesus Avila
Publisher : Frontiers E-books
ISBN 13 : 288919261X
Total Pages : 114 pages
Book Rating : 4.18/5 ( download)

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Download or read book Tau oligomers written by Jesus Avila and published by Frontiers E-books. This book was released on 2014-08-18 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neurofibrillary tangles (NFTs) composed of intracellular aggregates of tau protein are a key neuropathological feature of Alzheimer’s Disease (AD) and other neurodegenerative diseases, collectively termed tauopathies. The abundance of NFTs has been reported to correlate positively with the severity of cognitive impairment in AD. However, accumulating evidences derived from studies of experimental models have identified that NFTs themselves may not be neurotoxic. Now, many of tau researchers are seeking a “toxic” form of tau protein. Moreover, it was suggested that a “toxic” tau was capable to seed aggregation of native tau protein and to propagate in a prion-like manner. However, the exact neurotoxic tau species remain unclear. Because mature tangles seem to be non-toxic component, “tau oligomers” as the candidate of “toxic” tau have been investigated for more than one decade. In this topic, we will discuss our consensus of “tau oligomers” because the term of “tau oligomers” [e.g. dimer (disulfide bond-dependent or independent), multimer (more than dimer), granular (definition by EM or AFM) and maybe small filamentous aggregates] has been used by each researchers definition. From a biochemical point of view, tau protein has several unique characteristics such as natively unfolded conformation, thermo-stability, acid-stability, and capability of post-translational modifications. Although tau protein research has been continued for a long time, we are still missing the mechanisms of NFT formation. It is unclear how the conversion is occurred from natively unfolded protein to abnormally mis-folded protein. It remains unknown how tau protein can be formed filaments [e.g. paired helical filament (PHF), straight filament and twisted filament] in cells albeit in vitro studies confirmed tau self-assembly by several inducing factors. Researchers are still debating whether tau oligomerization is primary event rather than tau phosphorylation in the tau pathogenesis. Inhibition of either tau phosphorylation or aggregation has been investigated for the prevention of tauopathies, however, it will make an irrelevant result if we don’t know an exact target of neurotoxicity. It is a time to have a consensus of definition, terminology and methodology for the identification of “tau oligomers”.

Author : A. Ya. Malkin
Publisher : John Wiley & Sons
ISBN 13 : 352761494X
Total Pages : 326 pages
Book Rating : 4.43/5 ( download)

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Download or read book Rheokinetics written by A. Ya. Malkin and published by John Wiley & Sons. This book was released on 2008-09-26 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : K.L. Mittal
Publisher : Springer Science & Business Media
ISBN 13 : 1461576377
Total Pages : 626 pages
Book Rating : 4.72/5 ( download)

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Download or read book Polyimides written by K.L. Mittal and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: This and its companion Volume 2 chronicle the proceedings of the First Technical Conference on Polyimides: Synthesis, Char acterization and Applications held under the auspices of the Mid Hudson Section of the Society of Plastics Engineers at Ellenville, New York, November 10-12, 1982. In the last decade or so there has been an accelerated interest in the use of polyimides for a variety of applications in a number of widely differing technologies. The applications of polyimides range from aerospace to microelectronics to medical field, and this is attributed to the fact that polyimides offer certain desirable traits, inter alia, high temperature stability. Polyimides are used as organic insulators, as adhesives, as coat ings, in composites, just to name a few of their uses. Even a casual search of the literature will underscore the importance of this class of materials and the high tempo of R&D activity taking place in the area of polyimides. So it was deemed that a conference on polyimides was both timely and needed. This conference was designed to provide a forum for discussion of various ramifications of polyimides, to bring together scientists and technologists interested in all aspects of polyimides and thus to provide an opportunity for cross-pollination of ideas, and to highlight areas which needed further and intensi fied R&D efforts. If the comments from the attendees are a baro meter of the success of a conference, then this event was highly successful and fulfilled amply its stated objectives.

Author : Klaus Müllen
Publisher : John Wiley & Sons
ISBN 13 : 352761205X
Total Pages : 627 pages
Book Rating : 4.55/5 ( download)

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Download or read book Electronic Materials: The Oligomer Approach written by Klaus Müllen and published by John Wiley & Sons. This book was released on 2008-11-20 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electroactive oligomers form an important class of advanced materials for the development of new devices such as thin-film, flexible batteries; semiconductors; large-area optical displays; and sensors. In addition, the study of oligomeric model compounds is an essential prerequisite for understanding and developing polymers for electronics and optoelectronics applications. Written and edited by leading scientists in the field, this applications-oriented handbook represents the first comprehensive, systematic study of electroactive oligomeric materials. Special emphasis is placed on a critical review of the literature; relevant materials and technical data are collected in tables throughout. Includes - materials synthesis - structure--property relationship as a function of chain-length - applications in optics and electronics - oligomers as models for polymers - the role of oligomers in tomorrow's technology? Electronic Materials - The Oligomer Approach offers a stimulating combination of basic concepts and practical applications. It is sure to become a standard reference source that no-one working in the field can do without.

Author : Boris A Rozenberg
Publisher : CRC Press
ISBN 13 : 1134453841
Total Pages : 252 pages
Book Rating : 4.49/5 ( download)

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Download or read book Heterophase Network Polymers written by Boris A Rozenberg and published by CRC Press. This book was released on 2020-02-03 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume explains the theory and experimental investigations in the preparation of heterophase polymer network materials through cure reaction-induced microphase separation (CRIMPS). It describes the synthesis of a new family of block- and graft-copolymers with controlled solubility in epoxies and characterizes CRIMPS processes using novel applications of known methods such as nuclear magnetic resonance, electron spin resonance and photochemistry. The text develops a new method for characterizing the molecular mass distribution (MMD) of linear and network polymers using thermomechanical analysis data, as well as new methods for determining internal stresses and flaw formation during thermoset curing. The CRIMPS theory will be helpful for researchers and engineers designing and improving toughened plastics and other smart heterophase network materials for different applications. The new method for MMD characterization of polymers in bulk will be very useful to quickly analyze a polymer's MMD and to design new polymers. This book will provide a useful reference for graduates, researchers and working professionals in polymer chemistry and physics and materials science.