Preparation of Inorganic/Organic Composite by Sol-Gel Process in the Presence of Polymer-Grafted Ultrafine Inorganic Particles and Its Solvent-Sensing Properties

聚合物接枝超细无机颗粒溶胶-凝胶法制备无机/有机复合材料及其溶剂传感性能

基本信息

批准号：
12650712
负责人：
FUJIKI Kazuhiro
金额：
$ 0.26万
依托单位：
Joetsu University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

We examined the preparation of a novel inorganic/organic composite by sol-gel process in the presence of polymer-grafted inorganic ultrafine particles and the solvent-sensing properties of the composite in the various solvents. When sol-gel reaction of tetraethoxysilane was carried out in the presence of poly (N-vinyl-2-pyrrolidone)-grafted, and poly (2-methyl-2-oxazoline)-grafted carbon black, a deep black silica gel/carbon black composite in which carbon black particles were uniformly incorporated was obtained. The radical graft polymerizations of vinyl monomers onto the prepared composite surface was tried by use of radical initiators in the presence of the composite. During the polymerizations, part of the resultant vinyl polymers grafted onto the composite surface by the radical scavenging reaction of carbon black particles in the composite: the percentage of grafting was in the range of 3-8%. The solvent adsorption properties of the silica gel/carbon black composite varied with the solubility of grafted polymer chains on the carbon black surface and the composite surface toward the immersion solvent. In the case of the good solvent for both the grafted polymer chains of the carbon black surface and the composite surface, the silica gel/carbon black composite selectively adsorbed the solvent. Electric resistance of the polymer-grafted silica gel/carbon black composite was also very sensitive to the good solvent of the grafted polymer chains: the electric resistance drastically decreased in good solvent of both the grafted polymer chains of the carbon black surface and the composite surface, but it sparingly changed in poor solvent of the grafted polymer chains on both surfaces.

我们检查了在存在聚合物无机超铁颗粒的存在下通过溶胶 - 凝胶过程制备新型无机/有机复合材料的，并在各种溶剂中的复合材料的溶剂感应特性制备。当在聚（N-乙烯基-2-吡咯烷酮）植物的存在下进行四乙氧基硅烷的溶胶 - 凝胶反应，以及聚（2-甲基-2-恶唑）晶格的碳黑色，是一种深黑硅胶/碳黑色复合材料，获得了碳黑色颗粒均匀掺入的深黑硅胶/碳黑色复合材料。通过在复合材料的存在下使用自由基发起者，尝试了乙烯基单体在制备的复合表面上的自由基移植物聚合。在聚合过程中，由碳黑色颗粒在复合材料中的根本清除反应移植到复合表面上的一部分：嫁接百分比在3-8％的范围内。硅胶/碳黑色复合材料的溶剂吸附特性随碳黑色表面上移植聚合物链的溶解性而变化，并将复合表面朝向浸入溶剂。对于碳黑表面的接枝聚合物链和复合表面的良好溶剂，硅胶/碳黑色复合材料选择性地吸附了溶剂。 Electric resistance of the polymer-grafted silica gel/carbon black composite was also very sensitive to the good solvent of the grafted polymer chains: the electric resistance drastically decreased in good solvent of both the grafted polymer chains of the carbon black surface and the composite surface, but it sparingly changed in poor solvent of the grafted polymer chains on both surfaces.