Journal
COLLOID AND POLYMER SCIENCE
Volume 287, Issue 3, Pages 323-334Publisher
SPRINGER
DOI: 10.1007/s00396-008-1969-9
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Funding
- Ministry of Education of Japan [08558092, 09875232]
- Japan Society for the Promotion Science [15350127, 8655089, 20550183]
- New Energy and Industrial Technology Development Organization (NEDO), Japan
- University of Tsukuba
- Grants-in-Aid for Scientific Research [08558092, 20550183, 15350127, 09875232] Funding Source: KAKEN
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The swelling and shrinking kinetics of thermosensitive gels based on N-isopropylacrylamide (NiPAAm) and N-n-propylacrylamide (NnPAAm) were studied. Four gels cylindrical in shape were prepared by two different methods: gamma-ray irradiation to aqueous solutions of poly(NiPAAm) (PNiPAAm) or poly(NnPAAm) (PNnPAAm) and redox polymerization of NiPAAm or NnPAAm monomer using N,N'-methylenebisacrylamide as a crosslinker. There were a few differences in the swelling kinetics among these gels. However, a marked difference was observed in the shrinking processes, the rate of which was faster in the order of radiation-crosslinked PNiPAAm gel > radiation-crosslinked PNnPAAm gel > chemically crosslinked PNnPAAm gel > chemically crosslinked PNiPAAm gel. This difference was discussed in terms of the microscopic structure of the gels, which was studied by light scattering techniques. It was found that the static inhomogeneities frozen in the chemically and radiation-crosslinked gels play a key role in their shrinking kinetics.
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