文献类型：期刊文献

中文题名：Preparation and Properties of PMMA Modified Silica Aerogels from Diatomite

英文题名：Preparation and Properties of PMMA Modified Silica Aerogels from Diatomite

作者：Ma Hainan[1];Wang Baomin[1];Zhao Lei[2];Yuna Dawei[2]

第一作者：Ma Hainan

通讯作者：Wang, BM[1]

机构：[1]Dalian Univ Technol, Sch Civil Engn, Dalian 116024, Peoples R China;[2]Xinxiang Univ, Sch Civil Engn & Architecture, Xinxiang 453000, Peoples R China

第一机构：Dalian Univ Technol, Sch Civil Engn, Dalian 116024, Peoples R China

通讯机构：[1]corresponding author), Dalian Univ Technol, Sch Civil Engn, Dalian 116024, Peoples R China.

年份：2014

卷号：0

期号：5

起止页码：877-884

中文期刊名：武汉理工大学学报：材料科学英文版

外文期刊名：JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION

收录：CSTPCD;;EI(收录号：20145200368533);Scopus(收录号：2-s2.0-84919626876);WOS:【SCI-EXPANDED(收录号:WOS:000346400400004)】；

基金：Supported by the the National Natural Science Foundation of China (No. 51278086), PetroChina Innovation Fundation(No.2013D-5006-0606), the Program for New Century Excellent Talents in University by Ministry of Education of the People's Republic of China (No.NCET-12-0084), Liaoning BaiQianWan Talents of Science and Technology Program (No. 2012921073), Henan Open and Cooperation Project of Science and Technology (No.142106000023) and Dalian Plan Projects of Science and Technology (No. 2013A16GX113)

语种：英文

中文关键词：二氧化硅气凝胶;PMMA;硅藻土;改性;制备;聚甲基丙烯酸甲酯;BET比表面积;FESEM

外文关键词：silica aerogels; PMMA; diatomite; ambient pressure drying; mechanical properties

摘要：Diatomite was used as raw material to prepare sodium silicate with a modulus of 3.1 by alkalidissolution method and the resulted sodium silicate solution was employed as a precursor. Methyl methacrylate monomers were introduced in wet gels through solution-immersion, and upon heating at 70 ℃, the mesoporous surfaces throughout the skeletal framework were coated with the polymer layer. PMMA modified silica aerogels were successfully synthesized via ambient pressure drying. The properties were investigated by FTIR, NMR, TGA, nitrogen adsorption-desorption, FESEM and nano-indentation, etc. Results indicate that with the increasing of PMMA incorporated into silica aerogels, the bulk density and the BET surface area increase, the porosity decreases. Through the observation of FESEM, it is found that the interconnecting pores and the big pores add, the pore size distribution expands from 5-17 to 28-150 nm. By comparison, the PMMA modified silica aerogels achieve a 52-fold increase in hardness and a 10-fold increase in modulus.
Diatomite was used as raw material to prepare sodium silicate with a modulus of 3.1 by alkali dissolution method and the resulted sodium silicate solution was employed as a precursor. Methyl methacrylate monomers were introduced in wet gels through solution-immersion, and upon heating at 70 degrees, the mesoporous surfaces throughout the skeletal framework were coated with the polymer layer. PMMA modified silica aerogels were successfully synthesized via ambient pressure drying. The properties were investigated by FTIR, NMR, TGA, nitrogen adsorption-desorption, FESEM and nano-indentation, etc. Results indicate that with the increasing of PMMA incorporated into silica aerogels, the bulk density and the BET surface area increase, the porosity decreases. Through the observation of FESEM, it is found that the interconnecting pores and the big pores add, the pore size distribution expands from 5-17 to 28-150 nm. By comparison, the PMMA modified silica aerogels achieve a 52-fold increase in hardness and a 10-fold increase in modulus.