State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Shanghai 201620, People's Republic of China.
J Colloid Interface Sci. 2012 Apr 15;372(1):245-51. doi: 10.1016/j.jcis.2012.01.041. Epub 2012 Jan 28.
A novel stimuli-responsive organic/inorganic nanocomposite hydrogel (NC hydrogel) with excellent mechanical properties was synthesized by in situ polymerization of 2-(2-methoxyethoxy) ethyl methacrylate (MEO(2)MA), oligo (ethylene glycol) methacrylate (OEGMA) and acrylic acid (AAc), as the polymeric matrix (PMOA), and fibrillar attpulgite (AT), as the reinforcer and cross-linker. The effect of the AT content on the mechanical properties for the swollen and dried NC hydrogels was determined by tensile testing and dynamic mechanical analysis (DMA), respectively. The tensile testing results showed that the incorporation of AT nanoparticles significantly enhanced the mechanical properties of NC hydrogels. As the content of AT increased, the tensile strength, tensile modulus and effective cross-linked chain density increased. The DMA results showed that the storage modulus of AT/PMOA NC hydrogels was increased and the glass transition temperatures shifted to higher temperature compared to the pure PMOA hydrogel, which further indicated that the enhancement of mechanical property depended upon the presence and content of AT. In addition, the faster swelling rates of the NC hydrogels were observed in comparison with the corresponding physically cross-linked PMOA hydrogel, except for 1% AT/PMOA sample. However, the deswelling kinetics of NC hydrogels was obviously retarded.
一种新型的刺激响应性有机/无机纳米复合水凝胶（NC 水凝胶），具有优异的机械性能，是通过原位聚合 2-（2-甲氧基乙氧基）乙基甲基丙烯酸酯（MEO（2）MA）、聚乙二醇甲基丙烯酸酯（OEGMA）和丙烯酸（AAc），作为聚合基质（PMOA），以及纤维状凹凸棒土（AT），作为增强剂和交联剂合成的。通过拉伸试验和动态力学分析（DMA）分别测定了 AT 含量对溶胀和干燥 NC 水凝胶机械性能的影响。拉伸试验结果表明，AT 纳米粒子的加入显著提高了 NC 水凝胶的机械性能。随着 AT 含量的增加，拉伸强度、拉伸模量和有效交联链密度增加。DMA 结果表明，与纯 PMOA 水凝胶相比，AT/PMOA NC 水凝胶的储能模量增加，玻璃化转变温度向高温移动，这进一步表明机械性能的增强取决于 AT 的存在和含量。此外，与相应的物理交联 PMOA 水凝胶相比，除了 1% AT/PMOA 样品外，NC 水凝胶的溶胀速率更快。然而，NC 水凝胶的脱水动力学明显受到阻碍。
