Acrylic-based polyurethane/silica hybrids prepared by acid-catalyzed sol-gel process: Structure and mechanical properties

被引：11

作者：

Chen, GD ^{[1
]}

Zhou, SX ^{[1
]}

Gu, GX ^{[1
]}

Wu, LM ^{[1
]}

机构：

[1] Fudan Univ, Dept Mat Sci, Adv Coatings Res Ctr, China Educ Minist, Shanghai 200433, Peoples R China

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2005年 / 206卷 / 08期

关键词：

hybrids; mechanical properties; polyurethanes; silica sol; structure;

D O I：

10.1002/macp.200400478

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Silica sols were first prepared based on different ratios of tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) by an acid-catalyzed sol-gel process, and then incorporated into acrylic-based polyurethanes. The structures and morphologies of silicone-oxo clusters were studied by Si-29 NMR, SAXS, and scanning electron microscopy (SEM), whereas the mechanical properties of polyurethane/silica hybrids were characterized by DMA and tensile tests. The silicone-oxo clusters in both silica sol and polyurethane hybrids became denser and larger at a higher molar ratio of TEOS/MTES and higher silica content, and the silica-oxo clusters of polyurethane/silica hybrids even became more compact and larger than those of silica sols, increasing the elastic modulus and tensile strength of polyurethane/silica hybrids.

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页码：885 / 892

页数：8

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