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Aerogels from Chloromethyltrimethoxysilane and Their Functionalizations
Langmuir ( IF 3.9 ) Pub Date : 2017-11-20 00:00:00 , DOI: 10.1021/acs.langmuir.7b03013
Tomoki Kimura 1 , Taiyo Shimizu 1 , Kazuyoshi Kanamori 1 , Ayaka Maeno 2 , Hironori Kaji 2 , Kazuki Nakanishi 1
Affiliation  

Reactions of chloromethyltrimethoxysilane (CMTMS) and its derived colloidal network polychloromethylsilsesquioxane (PCMSQ) have been investigated to extend the material design strategy toward functionalized and mechanically reinforced aerogels. In a carefully designed sol–gel system, CMTMS has afforded transparent aerogels in the presence of cationic surfactant. The surface chloromethyl groups with polarity and reactivity are shown to be useful for supporting nanostructures, with photoluminescent carbon dots (C-dots) prepared from polyethylenimine and citric acid as an example. Furthermore, since nucleophilic substitution (SN2) reactions on the surface chloromethyl groups are found to control the equilibrium of formation/dissociation of siloxane bonds, a new gelation strategy triggered by SN2 reactions in sol–gel has been developed. In the presence of nucleophilic organic species such as polyamines, a hybrid network consisting of PCMSQ cross-linked with a polyamine nucleophile can be prepared to enhance mechanical properties of aerogel.

中文翻译:

氯甲基三甲氧基硅烷的气凝胶及其功能化

已经研究了氯甲基三甲氧基硅烷(CMTMS)及其衍生的胶体网络聚氯甲基倍半硅氧烷(PCMSQ)的反应,以将材料设计策略扩展到功能化和机械增强的气凝胶。在精心设计的溶胶-凝胶体系中,CMTMS在存在阳离子表面活性剂的情况下提供了透明的气凝胶。显示具有极性和反应性的表面氯甲基基团可用于支撑纳米结构,以由聚乙烯亚胺和柠檬酸制备的光致发光碳点(C-点)为例。此外,由于发现表面氯甲基上的亲核取代(S N 2)反应可控制硅氧烷键形成/解离的平衡,因此S N引发了新的胶凝策略已开发出2种溶胶-凝胶反应。在诸如聚胺之类的亲核有机物质的存在下,可以制备由与聚胺亲核试剂交联的PCMSQ组成的杂化网络,以增强气凝胶的机械性能。
更新日期:2017-11-20
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