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Small‐angle neutron scattering studies of chain conformation in semicrystalline hydrogenated polybutadiene
Author(s) -
Crist B.,
Wignall G. D.
Publication year - 1988
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/s0021889888006818
Subject(s) - polybutadiene , crystallinity , materials science , polymer , amorphous solid , quenching (fluorescence) , crystallization , scattering , neutron scattering , crystallization of polymers , deuterium , polymer chemistry , crystallography , copolymer , thermodynamics , chemistry , physics , optics , composite material , atomic physics , fluorescence
Mixtures of model crystallizable copolymers, hydrogenated polybutadiene (HPB) and deuterated polybutadiene (DPB), were investigated by SANS in the intermediate q range (0.02 ≤ q ≤ 0.18 Å −1 ). Linear and three‐arm‐star polymers were crystallized by quenching and slow cooling at rates differing by 3000‐fold. Care was taken in subtracting the incoherent background scattering. The coherent cross section shows a q −2 dependence which results in a constant Kratky plateau. Absolute SANS intensity is slightly greater than predicted for amorphous chains and is very insensitive to crystallization conditions in these polymers, changing by less than 10%. These observations are interpreted in terms of the gambler's‐ruin model for chain configurations in semicrystalline polymers.