Light Scattering Studies of Crystalline Polymers PDF Download

Author: William How-jen Chu
Publisher:
ISBN:
Category : Crystals
Languages : en
Pages : 332

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Author: Ronald J. Tabar
Publisher:
ISBN:
Category : Light
Languages : en
Pages : 584

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Author: D. Y. Yoon
Publisher:
ISBN:
Category : Crystals
Languages : en
Pages : 410

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Author: Errette Shemmell Bevins
Publisher:
ISBN:
Category : Light
Languages : en
Pages : 290

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Author: RICHARD S. STEIN
Publisher:
ISBN:
Category :
Languages : en
Pages : 1

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Author: Peggy Cebe
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 586

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Book Description
This book reflects the recent progress made in the field of scattering in polymers. A wide range of scattering studies on different polymer systems, including block copolymers, semicrystalline polymers, complex fluids, multicomponent systems, polymeric surfaces, and polymer processing are included, as well as new experimental techniques and theoretical treatments. This volume provides a comprehensive reference for those researchers who need to know how scattering techniques can be used to tackle different polymer problems, and is ideal for graduate polymer scientists studying scattering techniques.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 32

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The research objectives of this grant are to (1) characterize phase transitions theoretically and experimentally in molecular crystal systems, (2) use the above understanding gained by light scattering studies and theoretical interpretation to apply to the more complex system of lyotropic liquid crystals, and (3) knowledge gained on the model systems of increasing complexity is then applied to polymer liquid crystals and solid polymers as observed by laser light scattering techniques. Objective one has been definitely achieved as can be seen from the number of papers written in the last few years. Systems to have been experimentally and theoretically discussed are: trioxane, triazine, benzil, and chloranil. Others still to be investigated are: biphenyl, urea, thiourea, and hexamethyl benzene. Studies of lyotropic liquid crystals (sodium decyl sulfate, sodium sulfate, decanol, water) have been progressed to the point at which we will be reporting this data shortly. The major findings are: a number of phase transitions occur between 20 and 60 C; these transitions evidence strong critical behavior and long correlation times for fluctuations; and liquid crystals can be studied by light scattering in a unique and meaningful manner. Finally, some polymer studies were started which will be continued into the coming contract period. Spectra of solid powders, ribbons, and liquid crystals of PBT and solid PBO were obtained.

Author: R. S. Stein
Publisher:
ISBN:
Category :
Languages : en
Pages : 46

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The scattering of light by liquid crystals is primarily a result of orientation fluctuations and is formally similar to the scattering by solid crystalline polymers. Some experimental results for the photographic scattering of mesophases of cholesteryl myristate are presented. The patterns for the cholesteric state are similar to those for spherulitic polymers and are analyzed using the theory for scattering from media exhibiting non-random orientation correlations. As a result of the light scattering studies it may be shown that the cholesteric state is characterized by disc-like correlations, while the smectic state and solid cholesteryl myristate both show random orientation correlations. (Author).

Author: David Barr Cavanaugh
Publisher:
ISBN:
Category : Brillouin scattering
Languages : en
Pages : 276

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Author: Xiaolei Ao
Publisher:
ISBN:
Category : Polymer liquid crystals
Languages : en
Pages : 109

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Book Description