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Preparation of Asymmetric Thermosensitive Double-layer Gel

Published online by Cambridge University Press:  01 February 2011

Takashi Iizawa  and
Akihiro Terao
Takashi Iizawa
Affiliation:
[email protected], Hiroshima University, Chemical Engineering, Higashi-hiroshima, Japan
Akihiro Terao
Affiliation:
[email protected], Hiroshima University, Chemical Engineering, Higashi-Hiroshima, Japan
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Abstract

Heterogeneous amidation of poly(acrylic acid) gel-1,8-diazabicyclo-[5,4,0]-7-undecene salt (DAA) in N-methyl-2-pyrrolidone containing an excess of alkylamine and triphenylphosphite occurred from the surface to give the corresponding DAA-poly(N-alkylacrylamide) (PNAA) core-shell type gel, consisting of an unreacted DAA core and a quantitatively amidated shell layer. Further amidation of the DAA-PNAA core-shell type gel with a second alkylamine afforded a novel core-shell type gel consisting of two PNAA layers: PNAA(2) and PNAA(1). The resulting cylindrical PNAA(2)-PNAA(1) core-shell type gels were resistant to marked deformation caused by swelling/de-swelling because of their axial symmetry. This paper proposes a new approach to the preparation of asymmetric thermosensitive PNAA(2)-PNAA(1) double-layer gels by several procedures using the synthetic method of the core-shell type gels containing of poly(N-isopropylacrylamide) and poly(N-n-propylacrylamide) layers. Among the obtained asymmetric double-layer gels the model I type gel (cylindrical grooved PNNPA-PNIPA core-shell type gel) was markedly bent in water at temperatures between the lower critical solution temperatures of both layers.

Keywords

polymerchemical synthesiscore/shell
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1129: Symposium V – Materials and Devices for Smart Systems III , 2008 , 1129-V04-06
Copyright
Copyright © Materials Research Society 2009

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References

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