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Shrinking Behavior of Surfactant‐Grafted Thermosensitive Gels and the Mechanism of Rapid Shrinking
Author(s) -
Okeyoshi Kosuke,
Abe Tetsuya,
Noguchi Yuji,
Furukawa Hidemitsu,
Yoshida Ryo
Publication year - 2008
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200800067
Subject(s) - pulmonary surfactant , micelle , dynamic light scattering , homogeneity (statistics) , materials science , chemical engineering , kinetics , copolymer , self healing hydrogels , polymer chemistry , small angle x ray scattering , scattering , chemistry , nanoparticle , polymer , nanotechnology , composite material , optics , aqueous solution , statistics , mathematics , physics , quantum mechanics , engineering
Surfactant‐grafted hydrogels with a fast response to temperature were prepared. In order to clarify the mechanism of rapid shrinking, the effects of the grafted surfactant and the homogeneity of the main chain were investigated. Poly(NIPAAm‐ co ‐S180A) gels prepared using a chemical cross‐linker (bis‐PNS gels) exhibited rapid shrinking, as did PNS gels prepared by γ ‐ray irradiation ( γ ‐PNS gels). This suggested that the rapid shrinking of the PNS gel did not depend on the homogeneity of the main‐chain structure. The shrinking kinetics of the bis‐PNS gels depended on the amount of the introduced surfactant, which means that shrinking is enhanced by micelle formation as a dynamic driving force. From the analysis by dynamic light scattering (DLS) and scanning microscopic light scattering (SMILS), it was suggested that the micelle structure, which induced rapid shrinking, existed in the bis‐PNS gel.