Preparation and characterization of sodium carboxymethylcellulose/poly( N-isopropylacrylamide)/clay semi-IPN nanocomposite hydrogels

A new kind of pH-/temperature-responsive semi-interpenetrating polymer network hydrogels based on linear sodium carboxymethylcellulose (CMC) and poly( N-isopropylacrylamide) (PNIPA) cross-linked by inorganic clay (CMC/PNIPA/Clay hydrogel) was prepared. The temperature- and pH-responsive behaviors, t...

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Bibliographic Details
Published in:European polymer journal 2007-06, Vol.43 (6), p.2221-2228
Main Authors: Ma, Jinghong, Xu, Yajing, Fan, Bing, Liang, Borun
Format: Article
Language:English
Subjects:
Applied sciences
Clay
Composites
Exact sciences and technology
Forms of application and semi-finished materials
Hydrogel
pH-/temperature-responsive
Poly( N-isopropylacrylamide)
Polymer industry, paints, wood
Sodium carboxymethylcellulose
Technology of polymers
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Summary:A new kind of pH-/temperature-responsive semi-interpenetrating polymer network hydrogels based on linear sodium carboxymethylcellulose (CMC) and poly( N-isopropylacrylamide) (PNIPA) cross-linked by inorganic clay (CMC/PNIPA/Clay hydrogel) was prepared. The temperature- and pH-responsive behaviors, the mechanical properties of these hydrogels were investigated. The CMC/PNIPA/Clay hydrogels exhibited a volume phase transition temperature around 32 °C with no significant deviation from the conventional PNIPA hydrogels. The swelling ratio of the CMC/PNIPA/Clay hydrogels gradually decreased with increasing the contents of clay. The influence of pH value on swelling behaviors showed that there is a maximum swelling ratio at pH 5.9. Moreover, the CMC/PNIPA/Clay hydrogels exhibited excellent mechanical properties with high tensile stress and elongation at break in excess of 1200%.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2007.02.026