| Literature DB >> 15264660 |
Yong Pei1, Jei Chen, Liming Yang, Lili Shi, Qiong Tao, Baojun Hui, Jian Li.
Abstract
Poly(N-isopropylacrylamide) (PNIPAAm) and poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAAm-co-AAc)) hydrogels are synthesized by irradiating the aqueous solutions of NIPAAm and NIPAAm/AAc with 60Co gamma-ray. The effects of pH on the swelling ratio and on the lower critical solution temperature (LCST) are studied by determining the dependence of swelling ratio on temperature in different pH butter solutions. Differential scanning calorimetry (DSC) is applied in determination of the LCST of the hydrogels. Fourier transform infrared (FT-IR) spectrometry is used in the comparison of hydrogels swelled in various pH conditions. As a result, PNIPAAm was found to be a pH-sensitive hydrogel and the LCST of the PNIPAAm and P(NIPAAm-co-AAc) hydrogels are influenced by pH.Entities:
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Year: 2004 PMID： 15264660 DOI： 10.1163/156856204323046852
Source DB: PubMed Journal: J Biomater Sci Polym Ed ISSN： 0920-5063 Impact factor: 3.517