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Small‐angle neutron scattering from poly(NIPA‐ co ‐AMPS) gels
Author(s) -
TravasSejdic J.,
Easteal A.,
Knott R.,
Pedersen J.S.
Publication year - 2000
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/s002188980009988x
Subject(s) - neutron scattering , propane , small angle neutron scattering , scattering , atmospheric temperature range , small angle scattering , materials science , neutron , range (aeronautics) , intensity (physics) , analytical chemistry (journal) , chemistry , physics , optics , thermodynamics , chromatography , nuclear physics , organic chemistry , composite material
The microstructure of the poly(N‐isopropylacrylamide‐ co ‐acrylamido‐2‐methyl‐1‐propane sulphonic acid) gel, poly(NIPA‐ co ‐AMPS), was investigated as a function of temperature and cross‐link density using the small angle neutron scattering technique. The sample temperature was varied in the range 30 to 55C. Two different behaviours of poly(NIPA‐ co ‐AMPS) gels were observed. At low temperature (30C), the magnitude of the scattered intensity increased with cross‐link density suggesting that additional cross‐links introduced more inhomogeneities in the gel network. At high temperatures the trend was reversed; that is the lower cross‐link density, the higher the scattered intensity. Therefore, the role of cross‐links at high temperature was to suppress microphase separation. The fitting of the experimental data with the Rabin and Panyukov theory indicated qualitative agreement.