Preparation and properties of poly(vinyl acetate)silica-gel hybrids obtained by sol-gel process: Effect of methyl groups in silicon alkoxide

被引:3
作者
Yano, S
Kodomari, M
Furukawa, T
机构
[1] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 350, Japan
[2] Shibaura Inst Technol, Minato Ku, Tokyo 108, Japan
来源
SOL-GEL PRODUCTION | 1998年 / 150卷
关键词
poly(vinyl acetate); copoly(VAc/VTES); hybrid; tetraethoxysilane; methyltriethoxysilane; dimethyldiethoxysilane; sol-gel process;
D O I
10.4028/www.scientific.net/KEM.150.219
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A copolymer of vinyl acetate (VAc) and vinyl triethoxysilane (VTES) having molar ratio of 9:1 was synthesized and incorporated with silica-gel by the sol-gel process. Tetraethoxysilane (TEOS), methyltriethoxysilane (MTES), and dimethyldiethoxysilane (DMDES) were used as silicon alkoxides. The tensile strength of copoly(VAc/VTES)/silica-gel hybrids was higher than that of PVAc/silica-gel hybrids because of strong bonding between copolymer and silica-network. The strength of the copolymer hybrids prepared from TEOS and MTES increased up to 50 MPa and 43 MPa, respectively. On the other hand, the strength of the hybrid from DMDES decreased with DMDES content. The elongation of the hybrids increased by mixing 20 wt% of MTES and DMDES. The dynamic modulus, G', of the hybrids increased when they were prepared from TEOS and MTES. DMDES having two methyl groups in the alkoxide chain, decreased the G' value of the hybrid. The tan delta peak position of the hybrids from TEOS and MTES shifted to a higher temperature range with increasing amounts of mixed silicon alkoxides, but DMDES lowered the tan delta peak temperature.
引用
收藏
页码:219 / 225
页数:7
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