Preparation of novel ultrafine particles having solar energy conversion and storage ability and their application for composites

具有太阳能转换和储存能力的新型超细颗粒的制备及其在复合材料中的应用

基本信息

批准号：
13650745
负责人：
TSUBOKAWA Norio
金额：
$ 2.05万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The grafting of hyperbranched poly(amidoamine) (PAMAM) from the silica and carbon black surface was achieved by repeating two steps in solvent-free dry-system: (1) Michael addition of methylacrylate to amino groups on the surface and (2) amidation of terminal groups with ethylenediamine. Hyperbranched polyester was also grafted onto silica and carbon black surface by self condensation of bis(2-hydroxymethyl)propionic acid using p-toluenesulfonic acid as catalyst in the presence of silica having amino groups.The immobilization of norbornadiene (NBD) moieties onto silica and carbon black surface by the direct condensation of the surface terminal amino groups of hyperbranched PAMAM-grafted silica with 3-phenyl-2, 5-norbornadiene-2-carboxylic acid (NBD-COOH) was examined. It was found that the immobilization of NBD moieties onto silica and carbon black successfully proceeded in the presence of N, N'-dicyclohexylcarbodiimide (DCC) as a condensing agent. The immobilized NBD moieties onto the silica increased with increasing amount of amino groups of hyperbranched PAMAM-grafted silica, but the percentage of amino groups used for the immobilization of NBD moieties was decreased.The immobilization of NBD moieties onto silica and carbon black surface was achieved by the direct condensation of the surface terminal hydroxyl groups of hyperbranched polyester-grafted silica and carbon black with NBD-COOH in the presence of DCC.The immobilized NBD moieties on silica and carbon black were readily isomerized to quadricyclane (QD) by photo-irradiation in n-hexane. Stored thermal energy by QD-immobilized silica and carbon black was released as thermal energy by heating. The stored thermal energy of QD-immobilized silica increased with progress of the photo-irradiation time and became constant, about 30 J/g-silica, after 2 h.

通过在无溶剂的无溶性干系统中重复两个步骤来实现来自二氧化硅和碳黑色表面的超支聚（amidoamine）（PAMAM）（PAMAM）的接枝：（1）Michael将甲基丙烯酸酯添加到表面上的氨基和（2）用乙基二胺的末端基团的氨基氨基酰胺中。超支聚酯也通过在具有氨基的二甲苯磺酸（2-羟基甲基）丙酸的自凝p（2-羟基甲基）丙酸的自凝结中移植到二氧化硅和碳黑色表面上检查了使用3-苯基-2，5-脱甲基二烯-2-羧酸（NBD-COOH）的PAMAM-GRAFT的二氧化硅。发现在N，N'-Dicyclohexylcarbodiimide（DCC）作为冷凝剂的存在下，NBD部分固定在二氧化硅和碳黑色上。固定的NBD部分在二氧化硅上增加了，随着氨基量增加的氨基含量增加的帕芒 - 帕植物的二氧化硅，但是用于固定NBD部分的氨基的百分比降低了NBD的固定化。在DCC存在的情况下，碳黑色带有NBD-COOH。二氧化硅和碳黑色上的固定的NBD部分很容易通过N-己烷中的摄影剂将Quadricyclane（QD）异构化为Quadricyclane（QD）。通过QD-Immombobilized二氧化硅和碳黑色储存的热能通过加热释放为热能。随着光辐射时间的进展，QD-Immobilized二氧化硅的储存热能增加，并在2小时后变为恒定，大约30 j/g-silica。