Please use this identifier to cite or link to this item: https://doi.org/10.1021/la011325b
Title: Thermosensitive poly(N-isopropylacrylamide-co-acrylic acid) hydrogels with expanded network structures and improved oscillating swelling-deswelling properties
Authors: Zhang, X.-Z.
Yang, Y.-Y.
Wang, F.-J.
Chung, T.-S. 
Issue Date: 19-Mar-2002
Source: Zhang, X.-Z., Yang, Y.-Y., Wang, F.-J., Chung, T.-S. (2002-03-19). Thermosensitive poly(N-isopropylacrylamide-co-acrylic acid) hydrogels with expanded network structures and improved oscillating swelling-deswelling properties. Langmuir 18 (6) : 2013-2018. ScholarBank@NUS Repository. https://doi.org/10.1021/la011325b
Abstract: In this paper, a P(NIPAAm-co-AAc) hydrogel with rapid temperature sensitivity and improved oscillatory properties over small temperature cycles around the physiologic temperature of 37 °C was synthesized in an alkaline solution (Tris/HCl solution, pH 8.8 and I = 0.5 M). SEM micrographs revealed that the unique properties achieved can be attributed to the expanded network structure generated in the alkaline solution during the copolymerization reaction. As a result of the dissociation of the carboxyl groups (-COOH) of AAc to carboxylate anions (-COO-), the electrostatic repulsion between carboxylate anions was strong and led to the expanded conformations of polymer chains. Therefore, the network of the hydrogels thus obtained was extremely expanded and exhibited fast temperature sensitivity and improved oscillating swelling-deswelling properties.
Source Title: Langmuir
URI: http://scholarbank.nus.edu.sg/handle/10635/66888
ISSN: 07437463
DOI: 10.1021/la011325b
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