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

• Published in: Polymer journal Vol. 39; no. 11; pp. 1177 - 1184
• Main Authors: IIZAWA, Takashi, TERAO, Akihiro, OHUCHIDA, Machiko, MATSUURA, Yoshinobu, ONOHARA, Yukio
• Format: Journal Article
• Language: English
• 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
• ISSN: 0032-3896; 1349-0540
• DOI: 10.1295/polymj.PJ2007044

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.