Small-angle neutron scattering from poly(NIPA-co-AMPS) gels

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...

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Bibliographic Details
Published in:Journal of applied crystallography 2000-06, Vol.33 (3-1), p.735-739
Main Authors: Travas-Sejdic, J., Easteal, A., Knott, R., Pedersen, J.S.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
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Summary: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.
ISSN:1600-5767
0021-8898
1600-5767
DOI:10.1107/S002188980009988X