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 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 Liquid Crystalline Polymers written by Vijay Kumar Thakur and published by Springer. This book was released on 2015-08-25 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces various applications of liquid crystalline polymers as the emerging new class of high performance novel materials. The authors detail the advantageous properties of these LCs including optical anisotropic, transparency and easy control over structure. This interdisciplinary work includes valuable input from international projects with special focus on the use of liquid crystalline polymers and/or nanocomposites.

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 Flow Visualization and Modeling of Liquid Crystalline Polymers written by Mark Naoshi Kawaguchi and published by . This book was released on 1998 with total page 464 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 Melt Rheology and Its Role in Plastics Processing written by K. Wissbrun and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed to fulfill a dual role. On the one hand it provides a description of the rheological behavior of molten poly mers. On the other, it presents the role of rheology in melt processing operations. The account of rheology emphasises the underlying principles and presents results, but not detailed deriva tions of equations. The processing operations are described qualita tively, and wherever possible the role of rheology is discussed quantitatively. Little emphasis is given to non-rheological aspects of processes, for example, the design of machinery. The audience for which the book is intended is also dual in It includes scientists and engineers whose work in the nature. plastics industry requires some knowledge of aspects of rheology. Examples are the polymer synthetic chemist who is concerned with how a change in molecular weight will affect the melt viscosity and the extrusion engineer who needs to know the effects of a change in molecular weight distribution that might result from thermal degra dation. The audience also includes post-graduate students in polymer science and engineering who wish to acquire a more extensive background in rheology and perhaps become specialists in this area. Especially for the latter audience, references are given to more detailed accounts of specialized topics, such as constitutive relations and process simulations. Thus, the book could serve as a textbook for a graduate level course in polymer rheology, and it has been used for this purpose.

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 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 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 Liquid Crystalline Polymers written by A. M. Donald and published by Cambridge University Press. This book was released on 2006-05-11 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 2006 edition explaining the underlying science and applications of liquid crystalline polymers.

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 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 Molecular Orientation and Rheology of Liquid Crystalline Polymers Under Shear Flow written by Kwan Hongladarom and published by . This book was released on 1995 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 Rheology in Polymer Processing written by Krzysztof Wilczynski and published by Carl Hanser Verlag GmbH Co KG. This book was released on 2020-12-07 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: “Rheology in Polymer Processing” introduces the fundamentals of rheology and rheometry as the basis for modeling and computer-aided design in plastics processing. The logically structured content enables the reader to intelligently use the tools of computer-aided design and modeling of plastics processing, with correct interpretation of the results. The book presents difficult and complex issues of rheology and modeling in an accessible way, with particular emphasis on the practical engineering aspects. The software described in the book allows modeling all the important problems of plastics processing. Particular attention is paid to the extrusion process, which is fundamentally important as a processing technology in mass manufacture of plastic parts, and the basis of compounding processes (blending, filling, granulation, and reinforcement). This book is aimed equally at engineers, researchers, and scientists, as well as intermediate students, for whom it will serve as an ideal course book.