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Rapid synthesis of amine cross-linked epoxy and methyl co-modified silica aerogels by ambient pressure drying
Authors:Zaidong Shao  Guoyou Wu  Xuan Cheng  Ying Zhang
Affiliation:1. Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, Fujian 361005, China;2. Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen, Fujian 361005, China
Abstract:The silica aerogels were synthesized by sol–gel method via ambient pressure drying. Tetraethyl orthosilicate (TEOS) was used as a main silica source, methyltriethoxysilane (MTES) as a co-precursor silica source and (3-Glycidoxypropyl)trimethoxysilane (GPTMS) as a silane coupling agent. The silica aerogels obtained were further undergoing cross-linking epoxy from GPTMS with amine from diethylenetriamine (DETA) which played a dual role of base catalyst and reagent. The cumulative volumes for open pores of the cross-linked aerogels were evaluated to be 1.4 cm3/g. The Young's modulus and maximum compression strength were 25.4 MPa and 6.17 MPa, respectively. The addition of MTES accelerated the solvent exchange of alcohol within the pores with n-hexane and reduced the shrinkage of aerogels network during the ambient pressure drying. The formation of organic network enhanced the strength of the cross-linked aerogels to prevent the crack generation and the subsequent failure of the monolith during the ambient drying, therefore, protected the nanoporous structure of aerogels.
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