期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 20, 期 17, 页码 3458-3466出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b922775j
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资金
- Korea National Research Foundation [R15-2006-022-01001-0]
Vinyltrimethoxysilane (VTMS)-modified silica particles were incorporated into the chain of amorphous polyurethane (PU) by covalent bonds, to synthesize an organic-inorganic hybrid material with an extremely long relaxation time. At 1% silica, the PU-silica chemical hybrids gave over 99% shape fixity and shape recovery with <2% hysteresis during the four thermomechanical cycles. As silica content increases (2, 3%) shape memory performance slightly decreased with repeated cycles. Results were favorably compared with PUs cross-linked by hydroxyl ethylacrylate (HEA) and VTMS, and physical blends with silica particles. The results were interpreted based on the triple effects of silica particles as multifunctional cross-linkers, reinforcing fillers, and relaxation retarders of the polymer chains during loading and unloading.
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