期刊
POLYMER
卷 54, 期 7, 页码 1846-1852出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2013.02.008
关键词
Nanocomposite cryogels; Micro-pores; Fast deswelling
资金
- NSF of China [51173052]
- Major State Basic Research Development Program of China (973 Program) [2012CB821504]
- China Postdoctoral Science Foundation [2012M511800]
Poly(N-isopropylacrylamide) (PNIPAm)-hectorite clay nanocomposite cryogels (NC-C gels) were prepared by freezing polymerization at -18 degrees C of NIPAm monomer in the aqueous hectorite clay suspensions. The clay concentration C-xLS was found to be a key factor determining the characters of the NC-C gels, because the average interparticle distance became smaller than the clay diameter when C-xLS > 6 w/v%. The NC-C gels of C-xLS <= 6.0 w/v% were heterogeneous at the nascent state and became homogeneous after 24 h thawing, which endowed the cryogels self-improved mechanical strength and elongation up to 900%. On the contrary, for the NC-C gels of C-xLS > 6.0 w/v%, the extensibility was about half of the corresponding normal NC gels, suggesting that the heterogeneity cannot be homogenized after 24 h thawing. The deswelling and reswelling rate of the NC-C gels of C-xLS > 6 w/v% was significantly accelerated due to the micropore structure formed by the molten ice crystals. The micro-pores were observed with SEM and CLSM from the cryogels with the clay content higher than 6 w/v%. The extensibility of the NC-C gels was much higher than other cryogels with high deswelling rate, promising some possible applications. (c) 2013 Elsevier Ltd. All rights reserved.
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