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Investigation of the superstructure of polymers during deformation by synchrotron radiation
Author(s) -
Wilke W.,
Bratrich M.
Publication year - 1991
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889890013243
Subject(s) - paracrystalline , superstructure , crystallinity , polyethylene , synchrotron radiation , materials science , polymer , monoclinic crystal system , intensity (physics) , synchrotron , deformation (meteorology) , scattering , crystallography , low density polyethylene , molecular physics , optics , composite material , chemistry , thermodynamics , crystal structure , physics
Firstly a short review of some frequently used models for fibre structures is given. Then a model, based on a three‐dimensional monoclinic paracrystalline macrolattice is described. This model allows the calculation of the two‐dimensional intensity distribution for the small‐angle scattering from semicrystalline polymers with different orientational states. The parameters of the model result from comparison with the measured intensity. The method of analysis is applied to low‐density polyethylene deformed uniaxially at different temperatures. The use of synchrotron radiation makes it possible to follow the destruction and rebuilding of the superstructure. A reversible change of the superstructure during stretching and relaxing was found for different draw ratios for very high‐molecular‐weight polyethylene samples.