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

作者：Chen GD; Zhou SX; Gu GX; Wu LM^*

来源：Macromolecular Chemistry and Physics, 2005, 206(8): 885-892.

DOI：10.1002/macp.200400478

• hybrids
• mechanical properties
• polyurethanes
• silica sol
• structure

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.

• 出版日期2005-4-13
• 单位复旦大学