| Summary: | 碩士 === 淡江大學 === 化學學系碩士班 === 95 === Epoxy/silica nano-composite materials are prepared by silane-terminated epoxy resin with tetraethoxysilane (TEOS) and nano-silica via a sol-gel process, respectively. The silane-terminated epoxy resin (EP-APTES) is obtained from a ring opening reaction of an epoxy resin (e.g. its EEW is 818) with 3-aminopropyltriethoxysilane (APTES).
The nano-composites are prepared by mixing EP-APTES with various dosages of TEOS and nano-silica (dispersed in methanol solution), respectively in 5, 10, or 20 phr. The epoxy/silica nano-composites formation are catalyzed in acidic (pH= 3) and basic (pH=10) conditions, respectively via a sol-gel process.
The performance properties, such as gel content, pencil hardness, contact angle, thermal stabilities and etc. of these resulted epoxy/silica nano-composites are enhanced with increasing silica dosage. Silica nano-size distribution of nano-composites from acidic condition is far better than that of obtained from base catalytic condition, which are demonstrated by SEM observations.
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