Synthesis and Swelling/De-swelling Behavior of Core-Shell Type Gel Consisting of Two Different Poly( -alkylacrylamide) Gel Layers

When poly(acrylic acid) gel-1,8-diazabicyclo-[5,4,0]-7-undecene salt (DAA) was placed in N-methyl-2-pyrrolidone containing an excess of alkylamine and triphenylphosphine, selective amidation occurred from the surface to give the corresponding DAA-poly(N-alkylacrylamide) (PNAA) core-shell type gel, c...

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Published inPolymer journal Vol. 39; no. 11; pp. 1177 - 1184
Main Authors IIZAWA, Takashi, TERAO, Akihiro, OHUCHIDA, Machiko, MATSUURA, Yoshinobu, ONOHARA, Yukio
Format Journal Article
LanguageEnglish
Published Tokyo Society of Polymer Science 01.01.2007
Nature Publishing Group
Subjects
Alkylamines
Applied sciences
Deformation
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Shells
Solution and gel properties
Swelling
Symmetry
Synthesis
Thermal properties
Surface reaction
Swelling
De-swelling
Temperature effect
Experimental study
Cylindrical shape
Acrylamide derivative polymer
Amidation
Core-shell Type Gel/ swelling
Colloidal gel
Chemical modification
Thermosensitive Gel
Poly(N-alkylacrylamide) Gel
Preparation
Acrylate salt polymer
Semi-cylindrical Gel
Kinetics
Primary amine
Heterogeneous reaction
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Summary:When poly(acrylic acid) gel-1,8-diazabicyclo-[5,4,0]-7-undecene salt (DAA) was placed in N-methyl-2-pyrrolidone containing an excess of alkylamine and triphenylphosphine, selective amidation 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). Thermal properties of the resulting core-shell type gels, such as swelling/de-swelling behavior, were measured in water at various temperatures. 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. In contrast, the semi-cylindrical double-layer gel prepared from the cylindrical poly(N-isopropylacrylamide)-poly(N-n-propylacrylamide) core-shell type gel was markedly bent in water at temperatures between the lower critical solution temperatures of both layers.
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ISSN:0032-3896
1349-0540
DOI:10.1295/polymj.PJ2007044