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Analysis of anisotropy of small‐angle neutron scattering of polyethylene single crystals
Author(s) -
Sadler D. M.
Publication year - 1983
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/s0021889883010936
Subject(s) - lamellar structure , anisotropy , crystallite , lamella (surface anatomy) , materials science , scattering , small angle scattering , crystallography , annealing (glass) , polyethylene , condensed matter physics , small angle neutron scattering , neutron scattering , optics , molecular physics , chemistry , composite material , physics
A method is described which provides an efficient way of analysing degrees of anisotropy in small‐angle scattering. It is applied to isotopic mixtures of polyethylene crystallized from solution, and to the same system which has been annealed (heat treated). The degree of orientation of the lamellar crystallites is measured separately. The results can then be given in terms of molecular dimensions along and at right angles to the lamellar normals. It is found that each molecule is probably restricted to one lamella, and that its dimension along the lamellar normal increases on annealing.