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Synthesis Of A Side Chain Liquid Crystalline Polymer And Phase Separation Behavior And Morphology Of Lcp K 21 Mixtures
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Book Synopsis Synthesis of a Side Chain Liquid Crystalline Polymer and Phase Separation Behavior and Morphology of LCP/K-21 Mixtures by : Jaehyuck Choi
Download or read book Synthesis of a Side Chain Liquid Crystalline Polymer and Phase Separation Behavior and Morphology of LCP/K-21 Mixtures written by Jaehyuck Choi and published by . This book was released on 1999 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization. 4. Synthesis of Amorphous and Side Chain Liquid Crystal AB Block Copolymers by :
Download or read book Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization. 4. Synthesis of Amorphous and Side Chain Liquid Crystal AB Block Copolymers written by and published by . This book was released on 1992 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diblock copolymers with well defined block length yield ordered phase separation. Morphology of the microphase separation is controllable by varying the weight ratio of the two blocks and the length of each block. If one of the blocks is a side chain liquid crystalline polymer (SCLCP), microphase separated systems with liquid crystalline microphases may be realized. Such systems are of fundamental as well as practical interest. The effect of size and type of the liquid crystalline microphase transition is one of the fundamental questions. This effect is recently investigated by the polymer system in which low molecular weight liquid crystals are dispersed. Different from the low molecular weight liquid crystals dispersed systems, the block copolymer can give several types of microdomains (lamellae, cylinders, or spheres).
Book Synopsis Liquid Crystalline Polymer Systems by : Avraam I. Isayev
Download or read book Liquid Crystalline Polymer Systems written by Avraam I. Isayev and published by . This book was released on 1996 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive report on the synthesis, structure, rheology, processing, performance, and applications of liquid-crystalline polymers (LCPs). Discusses self-reinforced composites prepared through the melt processing of thermoplastics and thermotropic LCPs. Addresses current research efforts in making polymer-dispersed liquid crystals. Reports recent studies on the structure and phase behavior of mesophases. Describes the synthesis and properties of new main-chain and side-chain liquid-crystalline block copolymers, mesogen-jacketed LCPs, and liquid-crystalline thermosets.
Book Synopsis Thermotropic Liquid Crystal Polymer Blends by : Francesco Paolo La Mantia
Download or read book Thermotropic Liquid Crystal Polymer Blends written by Francesco Paolo La Mantia and published by CRC Press. This book was released on 1993-12-04 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, studies by both industry and academic researchers have opened the door to improving performance and reducing costs of these new materials. The particular structure and morphology of LCPs, as well as their peculiar rheological behavior, have stimulated researchers to develop new theoretical models and new characterization and processing techniques to more fully understand and utilize LCPs. Although the scientific literature is very rich in data on the synthetic techniques and on the relations between structure and phase behavior of these new polymers, the understanding of the rheological and processing aspects is still far from satisfactory-particularly in the case of LCP blends. In fact, although an appreciable number of patents and scientific papers have appeared describing the phase behavior, the rheology, and the mechanical properties of many of these polyblends, several aspects of the relations between processing and morphology, and between morphology and properties of these materials are still obscure or even controversial. Now, this new book, written by leading researchers, provides an up-to-date guide and reference to the processing, rheology and applications of pure LCPs and LCP blends. The book concisely reviews the synthetic procedures for the production of LCPs and discusses the rheological behavior and processing methods. Plus, the book examines present and future applications areas of LCPs and LCP blends.
Book Synopsis Liquid Crystal Polymers by : D. Coates
Download or read book Liquid Crystal Polymers written by D. Coates and published by iSmithers Rapra Publishing. This book was released on 2000 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystal polymers (LCPs) have a wide range of uses, from strong engineering plastics to delicate gels for use in liquid crystal (LC) displays. For this reason, it is essential reading for materials scientists, engineers or technologists in industry, as well as research laboratories or academia. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database gives useful references for further reading.
Book Synopsis Liquid-crystalline Polymers by : American Chemical Society. Meeting
Download or read book Liquid-crystalline Polymers written by American Chemical Society. Meeting and published by . This book was released on 1990 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume explores the creation, study, and processing of new liquid-crystalline polymers. It covers not only the chemistry of liquid-crystalline polymers, but also the physics and engineering aspects of these materials. A wide range of topics is covered, including syntheses of main-chain and side-chain LCPs, structural characterization of LP, rheology and processing, and applications such a electro-optics and "self-reinforcing" blends. This book presents a broad view of the direction of LCP research in both industry and academe.
Book Synopsis Synthesis, Phase Transition, Morphology, and Rheology of Combined Main-chain and Side-chain Liquid-crystalline Polymers in Both Thermotropic and Lyotropic States by : Ming Zhou
Download or read book Synthesis, Phase Transition, Morphology, and Rheology of Combined Main-chain and Side-chain Liquid-crystalline Polymers in Both Thermotropic and Lyotropic States written by Ming Zhou and published by . This book was released on 2006 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A combined main-chain/side chain liquid-crystalline polymer (MCSCLCP), PSHQ4-7CNCOOH, whose chemical structure of main-chain backbone is poly[(phenylsulfonyl)-p-phenylenene-1,4-tetramethylenebis(4-oxybenzoate)] and side-chain mesogen is 8-[(4-cyano-4'-phenyl)oxy]octanoic acid (7CNCOOH), was synthesized by condensation polymerization. For comparison, the corresponding main-chain liquid crystalline polymer PSHQ4 was also synthesized. The results of differential scanning calorimetry show that PSHQ4-7CNCOOH undergoes a glass transition at 85°C, and a nematic-to-isotropic (N-I) transition at 172°C; then it is a glassy nematic polymer. On the other hand, it has been found the PSHQ4 undergoes a glass transition at 130°C, an N-I transition at 260°C, and crystallization at temperatures between 130 and 260°C. Both the powder and fiber pattern of wide-angle X-ray diffraction indicate the presence of crystalline structure in PSHQ4. The images of polarized optical microscopy have shown that both PSHQ4-7CNCOOH and PSHQ4 have Schlieren texture. Banded structure appears in both the thermotropic state and lyotropic states of PSHQ4-7CNCOOH. The grafting of side-chain mesogenic groups (7CNCOOH) onto the main-chain backbone of PSHQ4 has significantly increased the bulkiness of PSHQ4-7CNCOOH, which apparently cannot pack well, giving rise to a glassy state. Also synthesized was PSHQ4-11CNCOOH having eleven methylene units in the side chain (11CNCOOH) grafted onto the main-chain backbone of PSHQ4. The transient shear flow, steady-state shear flow, oscillatory shear flow, and time evolution of dynamic moduli, upon cessation of shear flow, of PSHQ4-7CNCOOH and PSHQ4 in the thermotropic state were investigated. One of the objectives of this study was to investigate the role of side-chain mesogenic groups (7CNCOOH) influencing the rheological behaviors of PSHQ4-7CNCOOH in the thermotropic state. Thus, for comparison, the rheological behaviors of PSHQ4 were also investigated. Only positive values of first normal stress difference (N1) in steady-state shear flow were observed during the entire range of shear rates and temperatures investigated. Another objective of this study was to investigate the rheological behaviors of combined MCSCLCP in the lyotropic state. For this, lyotropic solutions of various concentration (22-70 wt%) of PSHQ4-7CNCOOH, and lyotropic solutions of 23 wt% and 30 wt% of smectic-forming PSHQ4-11CNCOOH dissolved in o-dichlorobenzene were prepared for rheological measurements. The major thrust was to investigate whether the lyotropic solutions of PSHQ4-7CNCOOH and PSHQ4-11CNCOOH might give rise to negative values of N1, and the effect of flexible spacer length of side-chain mesogenic groups (nCNCOOH) on the rheological behaviors of combined MCSCLCPs in the lyotropic state. Indeed, negative values of N1 were observed at intermediate shear rates for lyotropic solutions of PSHQ4-7CNCOOH having the concentration up to 27 wt%, and for 23 wt% lyotropic solutions of PSHQ4-11CNCOOH. Interestingly, negative values of N1 became positive as the measurement temperature decreased below a certain critical value. Thus, the sign of N1 is found to depend on both the concentration and temperature of the lyotropic solutions of PSHQ4-7CNCOOH and PSHQ4-11CNCOOH. Also, flow reversal of lyotropic solutions of PSHQ4-7CNCOOH was investigated. It has been found that both shear stress and first normal stress difference do not follow strain scaling after flow reversal."--Abstract.
Book Synopsis Effect of Temperature and Shear on Phase Separation in Liquid Crystalline Polymer/polycarbonate Blends by : Kam-Wa (Danny) Lee
Download or read book Effect of Temperature and Shear on Phase Separation in Liquid Crystalline Polymer/polycarbonate Blends written by Kam-Wa (Danny) Lee and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrogen-bonded Side Chain Liquid Crystalline Block Copolymer by : Chi-Yang Chao
Download or read book Hydrogen-bonded Side Chain Liquid Crystalline Block Copolymer written by Chi-Yang Chao and published by . This book was released on 2003 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Equilibria and Self-organizing Behavior of Side-chain Liquid Crystalline Polymer Mixtures by : Hao-Wen Chiu
Download or read book Phase Equilibria and Self-organizing Behavior of Side-chain Liquid Crystalline Polymer Mixtures written by Hao-Wen Chiu and published by . This book was released on 1998 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization. 1. Influence of Molecular Weight, Polydispersity, and Flexible Spacer Length (n by :
Download or read book Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization. 1. Influence of Molecular Weight, Polydispersity, and Flexible Spacer Length (n written by and published by . This book was released on 1992 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The living ring opening metathesis polymerization of 5-carbo(n-(4'- methoxy-4-biphenylyl)oxy)alkyl)bicyclo(2.2.1)hept-2-ene (1-n, n=2-8) by Mo(CH-t- Bu)(NAr) (0-t-Bu)2(Ar=2,6-C6H3-t-Pr2) is described. Polymers with degrees of polymerization from 5 to 100 and narrow molecular weight distributions (Mw/Mn=1. 05-1.24) were obtained in high yield. All polymers exhibit an enantiomorphic nematic mesophase. Glass transition and isotropization temperatures increase with increasing molecular weight and become independent at approximately 30-50 repeat units. The change in enthalpy of isotropization is relatively independent of molecular weight. Using polymer blends, it was shown that polydispersity has no effect on either the transition temperatures or the temperature range of isotropization. Isotropization alternates in an odd-even manner up to spacer lengths of n=6, and then levels off. Living ring opening metathesis polymerization, Side chain liquid crystalline polymers (SCLCPs).
Book Synopsis Processing and Properties of Liquid Crystalline Polymers and LCP Based Blends by : Domenico Acierno
Download or read book Processing and Properties of Liquid Crystalline Polymers and LCP Based Blends written by Domenico Acierno and published by Scarborough, Ont. : ChemTec Pub.. This book was released on 1993 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some papers in this book report on the most recent developments in pure liquid crystalline polymers showing that discipline is dynamic and may offer in the future numerous other opportunities not known today. We hope that our selections of papers will be interesting for specialists in polymer chemistry, blends, and their industrial application, and that information included in this book will be stimulating and will favorably impact research currently performed by the readers of this book.
Book Synopsis Morphology and Self-assembly Behavior of Side Chain Liquid Crystalline Block Copolymers by : Eric Anton Verploegen
Download or read book Morphology and Self-assembly Behavior of Side Chain Liquid Crystalline Block Copolymers written by Eric Anton Verploegen and published by . This book was released on 2008 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Thermal annealing provides additional mobility for self-assembly often resulting in morphological rearrangements. Mechanical deformation can be used to orient the self-assembled structures relative to an applied shear flow. Additionally, the self-assembled morphologies of spin cast into thin films were investigated. The presence of the substrate has significant effects upon the orientation of the morphologies; thermal annealing and variations liquid crystal content are shown to be useful tools for achieving a wide range of thin film morphologies.
Book Synopsis Liquid-Crystal Polymers by : N.A. Platé
Download or read book Liquid-Crystal Polymers written by N.A. Platé and published by Springer Science & Business Media. This book was released on 1993-01-31 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drawing a picture of the current situation of this new field, this volume both summarizes the past achievements and analyzes the present unsolved problems.
Book Synopsis Phase Behavior in Mixtures of Smectic-LC/polymer, Nematic-LC/polymer and Smectic-LC/side-on Side-chain Liquid Crystalline Polymer by : Songxin Liang
Download or read book Phase Behavior in Mixtures of Smectic-LC/polymer, Nematic-LC/polymer and Smectic-LC/side-on Side-chain Liquid Crystalline Polymer written by Songxin Liang and published by . This book was released on 1998 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Design, Synthesis, Characterization, and Processing of Liquid Crystalline Diblock Copolymers by : Guoping Mao
Download or read book Molecular Design, Synthesis, Characterization, and Processing of Liquid Crystalline Diblock Copolymers written by Guoping Mao and published by . This book was released on 1997 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Chiral Liquid Crystalline Side-chain Polymers by : Kevin Charles Taylor
Download or read book Synthesis of Chiral Liquid Crystalline Side-chain Polymers written by Kevin Charles Taylor and published by . This book was released on 1987 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
