Download or read book Rheology and Changes in Structure of Thermotropic Liquid Crystalline Polymers written by Frederik Beekmans and published by . This book was released on 1997 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Rheology and Structure of Thermotropic Liquid Crystalline Polymers in Extensional Flow written by Thomas Stephen Wilson and published by . This book was released on 1991 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rheology and Processing of Liquid Crystal Polymers written by Domenico Acierno and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystal polymers (LCPs) have many strange properties that may be utilized to advantage in the processing of products made from them and their blends with isotropic polymers. This volume (volume 2 in the series Polymer Liquid Crystals) deals with their strange flow behaviour and the models put forward to explain the phenomena that occur in such polymers and their blends. It has been known for some time that small ad ditions of a thermotropic LCP to isotropic polymers not only gives an improvement in the strength and stiffness of the blend but improves the processability of the blend over that of the isotropic polymer. In the case of lyotropic LCPs, it is possible to create a molecular composite in which the reinforcement of an isotropic polymer is achieved at a molecular level by the addition of the LCP in a common solvent. If the phenomena can be fully understood both the reinforcement and an increase in the proces sability of isotropic polymers could be optimized. This book is intended to illustrate the current theories associated with the flow of LCPs and their blends in the hope that such an optimization will be achieved by future research. Chapter 1 introduces the subject of LCPs and describes the ter minology used; Chapter 2 then discusses the more complex phenomena associated with these materials. In Chapter 3, the way in which these phe nomena may be modelled using hamiltonians is fully covered.

Download or read book Shear Rheology and Texture of a Thermotropic Liquid Crystalline Polymer written by Edwin Gyuhue Kim and published by . This book was released on 1996 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Pendent Side Groups on the Rheology Mesophase Structure Molecular Packing and Conformational Properties of Thermotropic Liquid crystalline Polymers written by Dong-Ok Kim and published by . This book was released on 2000 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Influence of Phase Behavior and Microstructure on Liquid Crystal Polymer Rheology written by Douglass Steven Kalika and published by . This book was released on 1988 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rheology of Thermotropic Liquid crystalline Polymer written by Seung Su Kim and published by . This book was released on 1993 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on the Rheology and Morphology of Thermotropic Liquid Crystalline Polymers written by Dinshong Done and published by . This book was released on 1987 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Rheology Properties and Morphology of Thermotropic Liquid Crystalline Polymers written by Adrian Philip Pickles and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rheological Studies of Thermotropic Liquid Crystalline Polymers written by Hubertus Cornelis Langelaan (Materials specialist, Netherlands) and published by . This book was released on 1995 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rheological Behavior and Microstructural Characterization of Thermotropic Liquid Crystalline Polymers written by Tianren Guo and published by . This book was released on 2004 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymer Rheology and Processing written by A.A. Collyer and published by Springer Science & Business Media. This book was released on 1990-10-31 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Experimental Study of the Rheology of Thermotropic Liquid Crystalline Co polyesters written by David Wilson Giles and published by . This book was released on 1993 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rheological Studies of Thermotropic Liquid Crystalline Polymers written by Hubertus Cornelis Langelaan and published by . This book was released on 1995 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rheological Studies on Nematic Thermotropic Liquid Crystalline Polymers written by Sudhir Shantilal Bafna and published by . This book was released on 1989 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulations of Shearing Rheology of Thermotropic Liquid Crystalline Polymers written by Hongyan Chen (Polymer engineer) and published by . This book was released on 2008 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simulations present a first attempt to describe the rheological properties of the liquid crystalline polymers (LCPs), using recently developed thermodynamic theory of weakly viscoelastic nematodynamics. In this theory the complicated rheological properties of nematic LCPs are modeled by a set of quasi-linear anisotropic viscoelastic constitutive equations (CE) with anisotropy described by director, whose viscoelastic evolution is coupled with the evolution of director. Although this theory has been developed for relatively small viscoelastic effects, it is still possible to compare the simulations with experimental data. A new mathematical tool, algebra of nematic operators, is helpful in operations with this multi-parametric theory. There are eight parameters in the theory which include 3 viscosities, 3 elastic moduli, and 2 tumbling (elastic and viscous) parameters. These parameters established for steady shearing are used for the calculations of evolution of shear stress and first normal stress difference with corresponding evolution of director, during relaxation and start up flow. The problem with initial conditions for director in start up flow is resolved in the following way. We preliminarily fitted the experimental data for stresses in steady shearing with following adjustment of parameters to describealso the relaxation of stresses. In this case the parameters of evolution equation for director, along with its orientation in steady shearing were also established. The orientation of director during stress relaxation was then easily calculated, and its final orientation at the rest state was taken as initial one for the start up flow. We demonstrate that our simulations are at least in a semi-quantitative agreement with experimental data obtained for two industrial and two academic LCPs. Dependencies of fitted theoretical parameters on temperature and structure of LCPs have also been discussed.

Download or read book Polymer Rheology Theory and Practice written by Y.G. Yanovsky and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book is devoted to a rapidly developing field of science which studies the behavior of viscoelastic materials under the influence of deformation~the rheology of polymers. Rheology has long been treated as the theoretical foundation of polymer processing, and from this standpoint it is difficult to overesti mate its importance in practice. Rheology plays an important role in developing our ideas on the nature of viscoelastic behavior in connection with the structural features of polymers and composites based on them. This expands the possibilities of employing rheological methods to characterize a variety of materials and greatly magnifies the interest in this field of research. The rheological properties of polymer systems are studied experimen tally, chiefly under conditions of shear and tensile strains. One explana tion is that many aspects of polymer material processing are associated with the stretching of melts or a combination of shear and tensile strains. In scientific investigations, either periodic or continuous conditions of shear deformation are employed. Each mode provides widespread infor mation. In periodic deformation, most attention is generally given to conditions with low deformation amplitudes that do not alter the structure of the polymer system during an experiment (the region of linear deformation conditions). Here the viscoelastic parameters are generally determined with respect to the frequency. Continuous deforma tion involves considerable strains, and may be attended by significant reversible and irreversible changes in the structure of a polymer.