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Microscopic inhomogeneities in weakly‐charged temperature sensitive polymer gels and solutions
Author(s) -
Shibayama Mitsuhiro
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961060131
Subject(s) - aqueous solution , polymer , neutron scattering , polymer chemistry , acrylic acid , scattering , materials science , acrylamide , chemistry , physics , optics , composite material , copolymer
A comparison of small‐angle neutron scattering (SANS) intensity functions, I(q), was made between gels and solutions of poly(N‐isopropyl acrylamide‐ co ‐acrylic acid) (NIPA/AAc), where q is the magnitude of the scattering vector. I(q)'s were strongly dependent on polymer concentration as well as temperature. At low temperatures, I(q)'s for both gels and solutions were similar to each other and were monotonous decreasing functions. However, at high temperatures above θ, the so‐called theta temperature of poly‐NIPA in aqueous solution, both had a distinct peak and a significant difference appeared in I(q) due to the presence or absence of crosslinks. Origins of the peak and the differences in I(q) are discussed.