Thermosensitive poly(N-isopropylacrylamide-co-acrylamide) hydrogels:: Synthesis, swelling and interaction with ionic surfactants
Thermosensitive poly(N-isopropylacrylamide-co-acrylamide) hydrogels:: Synthesis, swelling and interaction with ionic surfactants
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DOI：
10.1016/j.eurpolymj.2005.07.006
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发表时间：
2006-02-01
影响因子：
6
通讯作者：
Demirel, G
中科院分区：
文献类型：
--
作者：
Caykara, T;Kiper, S;Demirel, G
以N-异丙基丙烯酰胺（NIPA）和丙烯酰胺（AAm）为单体，通过水溶液自由基聚合制备了温敏性水凝胶。N，N-亚甲基双（丙烯酰胺）（MBAAm）用作交联剂。吸收的动力学研究确定的运输机制。这些水凝胶的扩散系数计算的Fickian机制。结果表明，P（NIPA-coAAm）水凝胶的溶胀行为可以通过改变MBAAm的量来控制。研究了P（NIPAco-AAm）水凝胶在阴离子表面活性剂十二烷基硫酸钠（SIDS）和阳离子表面活性剂十二烷基三甲基溴化铵（DTAB）水溶液中的溶胀平衡随温度的变化规律。在SDS和DTAB溶液中，非离子型P（NIPA-co-AAm）水凝胶的平衡溶胀率增加，这是由于表面活性剂分子通过疏水相互作用结合到水凝胶中，使非离子型P（NIPA-co-AAm）水凝胶转变为非离子型水凝胶。此外，通过电导法测定了不同温度下P（NIPA-co-AAm）-表面活性剂体系中SDS和DTAB离子的含量，发现体系的电导率与表面活性剂的种类和浓度密切相关。(c)2005爱思唯尔有限公司保留所有权利。
Thermosensitive hydrogels were prepared by free-radical polymerization in aqueous solution from N-isopropylacrylamide (NIPA) and acrylamide (AAm) monomers. NN-Methylenebis(acrylamide) (MBAAm) was used as a crosslinker. A kinetic study of the absorption determined the transport mechanism. The diffusion coefficients of these hydrogels were calculated for the Fickian mechanism. It was shown that the swelling behavior of the P(NIPA-coAAm) hydrogels can be controlled by changing the amount of MBAAm. The swelling equilibrium of the P(NIPAco-AAm) hydrogels was also investigated as a function of temperature in aqueous solutions of the anionic surfactant sodium dodecyl sulfate (SIDS) and the cationic surfactant dodecyltrimethylammonium bromide (DTAB). In SDS and DTAB solutions, the equilibrium swelling ratio of the hydrogels increased, this is ascribed to the conversion of nonionic P(NIPA-co-AAm) hydrogel into polyelectrolyte hydrogels due to binding of surfactant molecules through the hydrophobic interaction. Additionally, the amount of free SDS and DTAB ions was measured at different temperatures by a conductometric method, it was found that the electric conductivity of the P(NIPA-co-AAm)-surfactant systems depended strongly on both the type and concentration of surfactant solutions. (c) 2005 Elsevier Ltd. All rights reserved.