Acceleration of Deswelling of Poly(N-isopropylacrylamide) Hydrogel by the Treatment of a Freeze-Dry and Hydration Process

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Abstract

The deswelling rate of a thermally-sensitive gel consisting of poly(<i>N</i>-isopropylacrylamide) crosslinked by 4% <i>N</i>,<i>N</i>′-methylenebisacrylamide (MBA) was accelerated at above the lower critical solution temperature (LCST) by the treatment of a freeze-dry and hydration process (freeze-dry treatment); it was roughly 10<sup>2</sup> times faster than the gel without a freeze-dry treatment. The values of the apparent activation energy (<i>E</i><sub>a</sub>’s) for the conventional gel crosslinked by 2 and 4% MBA was roughly 140 kJ mol<sup>−1</sup> each, and those for freeze-dry treated gel crosslinked by 2, 4, and 10% MBA were 24, 25, and 12 kJ mol<sup>−1</sup>, respectively. An SEM photomicrograph showed that the freeze-dry treatment made the gel porous. The freeze-dry treated gel exhibited a weaker shrinking force, and showed easy expansion compared with the conventional gel. An expansion of the diffusion area of water and a decrease of the thickness of the surface layer for a macroporous gel could be the reason for the increase in the deswelling rate.

Journal

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 70(6), 1289-1295, 1997-06-15

    The Chemical Society of Japan

References:  9

  • <no title>

    WU X. S.

    J. Int. Mater Syst. Struct 4, 202, 1993

    Cited by (1)

  • <no title>

    HIRASA O.

    Kobunsi Ronbunsyu 46, 661, 1989

    Cited by (1)

  • <no title>

    KABRA B. G.

    Polym.Commun. 32, 322, 1991

    Cited by (10)

  • <no title>

    WU X. S.

    J. Polym. Sci., Part A : Polym. Chem. 30, 2121, 1992

    Cited by (6)

  • <no title>

    AMIYA T.

    Macromolecules 20, 1162, 1987

    Cited by (2)

  • <no title>

    PARK T. G.

    J. Appl. Polym. Soc. 52, 85, 1994

    Cited by (1)

  • <no title>

    OTAKE K.

    Macromolecules 23, 283, 1990

    Cited by (9)

  • <no title>

    SHIBAYAMA M.

    Macromolecules 27, 5060, 1994

    Cited by (8)

  • <no title>

    SHIBAYAMA M.

    Macromolecules 29, 2019, 1996

    Cited by (8)

Codes

  • NII Article ID (NAID)
    10008919467
  • NII NACSIS-CAT ID (NCID)
    AA00580132
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00092673
  • NDL Article ID
    4240133
  • NDL Source Classification
    ZP1(科学技術--化学・化学工業)
  • NDL Call No.
    Z53-B35
  • Data Source
    CJP  NDL  J-STAGE 
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