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High Performance Polymers
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Water Behavior of Poly(acrylic acid)/ Poly (acrylonitrile) Semi-Interpenetrating Polymer Network Hydrogels

Seon Jeong Kim

Ki Jung Lee

Sang Min Lee

In Young Kim

Department of Biomedical Engineering, Hanyang University, Seoul, Korea

Sun I. Kim

Department of Biomedical Engineering, Hanyang University, Seoul, Korea sunkim{at},hanyang.ac.kr

Semi-interpenetrating polymer network (semi-LPN) hydrogels, composed of poly(acrylic acid) (PAAc) and poly(acrylonitrile) (PAN), were prepared using UV irradiation. The characteristics of semi-IPN hydrogels were investigated by swelling experiments, and differential scanning calorimetry (DSC). The semi-IPN hydrogels exhibited swelling ratio in the range of 24.1-81.8% at 35°C. The swelling ratio of the semi-IPN hydrogels depended on pH and temperature. DSC was used for the quantitative determination of the amounts of free and bound water. The free water contents in the semi-IPN hydrogel AN21, AN31, and AN41 were 1.2, 2.4, and 11.3% in pure water, respectively. Activation energies of semi-IPN hydrogels also were calculated.

Key Words: Hydrogel • poly(acrylic acid) • poly(acrylonitrile) • semi-IPN • swelling

High Performance Polymers, Vol. 16, No. 4, 625-635 (2004)
DOI: 10.1177/0954008304042473
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