Radiation induced synthesis and swelling characterization of thermo-responsive N-isopropylacrylamide-co-ionic hydrogels

被引：0
|
作者：
Kumar, Virendra [1 ]
Chaudhari, C.V. [1 ]
Bhardwaj, Y.K. [1 ]
Goel, N.K. [1 ]
Sabharwal, S. [1 ]
机构：
[1] Radiation Technology Development Section, Bhabha Atomic Research Center, HIRUP Building, Trombay, Mumbai 400085, India
来源：
European Polymer Journal | 2006年 / 42卷 / 02期
关键词：
Two-component thermo-responsive hydrogels poly(N-isopropylacrylamide)-co- vinylbenzyltrimethylammonium chloride (NIPA-co-VBT) and poly(N- isopropylacrylamide)-co-p-sodium styrene sulphonate (NIPA-co-SSS) were prepared by using high energy gamma radiation. The gels were characterized by Fourier transformed infrared spectroscopy (FTIR); scanning electron microscopy (SEM) and sol-gel analysis. The presence of ionic monomers in NIPA leads to lower gel content. Introduction of ionic components in the matrix enhanced swelling extent but caused slower volume transition. The swelling studies in alcohol indicated that swelling extent was function of polarity of the swelling medium and all gels followed the order water > methanol > ethanol > iso-propanol. In mixed co-solvents (water-alcohol); they exhibit complex reentrant behavior. The co-polymer gels containing VBT swelled faster and to higher extent than those containing SSS. The dynamic swelling studies indicated that diffusion of water in PNIPA gel shifts from Fickian for PNIPA to anomalous for NIPA-co-ionic gels also the mean swelling time (MST) decreases for gels containing ionic monomers. © 2005 Elsevier Ltd. All rights reserved;
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页码：235 / 246
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