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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.

在无溶剂干燥系统中，通过重复两个步骤，从二氧化硅和炭黑表面接枝超支化聚氨基胺（PAMAM）：(1)在表面的氨基上添加甲基丙烯酸酯，(2)在末端基上用乙二胺酰胺化。在含有氨基的二氧化硅存在下，以对甲苯磺酸为催化剂，通过双（2-羟甲基）丙酸的自缩合反应将超支化聚酯接枝到二氧化硅和炭黑表面。研究了用3-苯基- 2,5 -降冰片二烯-2-羧酸（NBD- cooh）直接缩合超支化pam接枝二氧化硅的表面末端氨基，将降冰片二烯（NBD）部分固定在二氧化硅和炭黑表面。结果表明，在N， N'-二环己基碳二亚胺（DCC）作为缩合剂的情况下，NBD部分成功地固定在二氧化硅和炭黑上。随着超支化pamam接枝二氧化硅的氨基数量的增加，固定化NBD片段的数量增加，但用于固定化NBD片段的氨基比例减少。在DCC存在下，NBD- cooh与超支化聚酯接枝二氧化硅和炭黑的表面末端羟基直接缩合，实现了NBD部分在二氧化硅和炭黑表面的固定。固定在二氧化硅和炭黑上的NBD基团在正己烷的光照射下很容易异构成四环（QD）。量子点固定化二氧化硅和炭黑所储存的热能通过加热释放为热能。随着光照射时间的延长，量子点固定化二氧化硅的储存热能逐渐增加，并在2 h后趋于稳定，约为30 J/g-二氧化硅。