A new route for organic-inorganic hybrid material synthesis through reactive processing without solvent
A new route for organic-inorganic hybrid material synthesis through reactive processing without solvent
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DOI：
10.1016/j.polymer.2003.12.027
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发表时间：
2004-03-01
期刊：
影响因子：
4.6
通讯作者：
Michel, A
中科院分区：
文献类型：
--
作者：
Bounor-Legaré, V;Angelloz, C;Michel, A
提出了一种制备有机-无机杂化材料的新途径。它是基于两个连续的步骤，前者是在熔融状态下，在二丁基氧化锡催化剂存在下，通过酯-烷氧基硅烷交换反应，使含有侧基酯基团的聚合物如聚（乙烯-共-乙酸乙烯酯）（伊娃）交联。后者是聚合物网络中可用的烷氧基硅烷基团的水解-缩合反应，导致二氧化硅网络共接枝到有机网络上。更具体地说，在固态下的水解-缩合反应，导致二氧化硅网络接枝和限制在有机网络中的解决在本工作中。采用气相色谱、红外光谱、固体核磁共振、平衡体积溶胀度和动态力学分析等手段对水解缩合反应进行了研究。已经证明两种副反应导致醇基团接枝到伊娃上。硅烷醇和这些醇基团可以参与酯和二氧化硅结构域之间的氢键。根据这种新的化学路线制备的有机-无机杂化物相对于伊娃表现出改善的机械和热机械性能，同时相对于通过原位聚合四乙氧基硅烷合成的纳米复合材料具有弹性体行为。(C)2003爱思唯尔有限公司。保留所有权利。
A new route to elaborate organic-inorganic hybrid materials is presented. It is based upon two successive steps, the former is the crosslinking of polymer which contains pendant ester groups such as poly(ethylene-co-vinyl acetate) (EVA) through ester-alkoxysilane interchange reaction in molten state in the presence of dibutyltin oxide as catalyst. The latter is the hydrolysis-condensation reactions of available alkoxysilane groups in the polymer network leading to the silica network co-grafted onto the organic network. More particularly the hydrolysis-condensation reactions in solid state leading to the silica network grafted and confined in the organic network are addressed in the present work. The progress of the hydrolysis-condensation reactions was investigated by gas chromatography, FT-IR spectroscopy, Si-29 solid NMR, volume swelling degree at equilibrium and dynamic mechanical analysis. Two side reactions have been evidenced leading to alcohol groups grafted onto EVA. The silanols and these alcohol groups can participate to hydrogen bonds between ester and silica domains. The organic - inorganic hybrids elaborated according to this new chemical route exhibit improved mechanical and thermomechanical properties with respect to the EVA while having an elastomeric behavior with respect to the nanocomposite synthesized by in situ polymerization of tetraethoxysilane. (C) 2003 Elsevier Ltd. All rights reserved.