Author: D. Y. YoonPublisher:
ISBN:
Category : Crystals
Languages : en
Pages : 410
Book Description
Light Scattering and Deformation Studies of Crystalline Polymers
Author: D. Y. YoonStudies of Rates of Spherulite Deformation by Low-angle Light Scattering
Author: P. ErhardtPublisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
An attempt was made to directly demonstrate spherulite deformation of a crystalline polymer and to establish whether the time dependence of crystal orientation is related to a time dependence of spherulite deformation. (Author).
Light Scattering Studies of Crystalline Polymers
Author: William How-jen ChuPublisher:
ISBN:
Category : Crystals
Languages : en
Pages : 332
Book Description
Quantitative Small-angle Light Scattering Studies of Semi-crystalline Polymers
Author: Ronald J. TabarPublisher:
ISBN:
Category : Light
Languages : en
Pages : 584
Book Description
Time-dependence of Crystal Orientation in Crystalline Polymers
Author: R. S. SteinPublisher:
ISBN:
Category :
Languages : en
Pages : 31
Book Description
The results of two methods for studying molecular processes accompanying the deformation of polyethylene are described. The examination of spherulite deformation by observing light scattering patterns along with measurement of the birefringence, stress and strain during the rapid extension of polyethylene shows that this initial structural deformation is essentially instantaneous. Dynamic x-ray diffraction shows that this is followed by a slower relaxation involving change in the orientation of the crystals by two processes, the lower temperature one involving slipping of lamellae past each other and the higher temperature one involving viscoelastic flow of the crystals. (Author).
Crystals and Crystallinity in Polymers
Author: Claudio De RosaPublisher: John Wiley & Sons
ISBN: 1118690796
Category : Technology & Engineering
Languages : en
Pages : 478
Book Description
Provides the tools needed to master and apply the fundamentals of polymer crystallography Using core concepts in physics, chemistry, polymer science and engineering, this book sheds new light on the complex field of polymer crystallography, enabling readers to evaluate polymer crystallization data and determine the best methods to use for their investigations. The authors set forth a variety of tested and proven methods for analyzing ordered and disordered structures in polymer crystals, including X-ray diffraction, electron diffraction, and microscopy. In addition to the basics, the book explores several advanced and emerging topics in the field such as symmetry breaking, frustration, and the principle of density-driven phase formation. Crystals and Crystallinity in Polymers introduces two new concepts in crystallinity and crystals in synthetic polymers. First, crystallinity in polymeric materials is compatible with the absence of true three-dimensional long-range order. Second, the disorder may be described as a structural feature, using the methods of X-ray scattering and electron diffraction analysis. The book begins by introducing the basic principles and methods for building structural models for the conformation of polymer crystal chains. Next, it covers: Packing of macromolecules in polymer crystals Methods for extracting structural parameters from diffraction data Defects and disorder in polymer crystals Analytical methods for diffuse scattering from disordered polymer structures Crystal habit Influence of crystal defects and structural disorder on the physical and mechanical properties of polymeric materials Crystals and Crystallinity in Polymers examines all the possible types of structural disorder generally present in polymer crystals and describes the influence of each kind of disorder on X-ray and electron diffraction patterns. Its comprehensive, expert coverage makes it possible for readers to learn and apply the fundamentals of polymer crystallography to solve a broad range of problems.
Research in Progress
Author: Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
A Study of Dynamic Optical Properties of Polymeric Solids
Author: Richard S. SteinPublisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
Structural changes accompanying the deformation of crystalline polymers have been studied by the techniques of (a) birefringence, (b) light scattering, (c) x-ray diffraction, and (d) dichroism. These techniques have been utilized for both static and dynamic measurements. They have demonstrated that upon deforming a crystalline polymer, the initial response is a deformation of the superstructure, followed by a viscoelastic rearrangement of crystals within the deformed matrix. Dynamic mechanical behavior has been correlated with dynamic optical behavior in an effort to elucidate structural response mechanisms. (Author).
Author: Hoe H. Chuah