溶膠－凝膠法製作熱塑型PU樹脂／矽氧有機－無機混成材料之性質

本研究以聚四甲基醚二醇、1，4-丁二醇與六亞甲基二異氰酸酯爲原料，以二階段合成法製備兩種熱塑型聚胺基甲酸酯樹脂(Thermoplastic polyurethane resin; TPU)，其中TPU-A及TPU-B樹脂之硬鏈段含量(Hard segment content)分別爲23.5%及27.5%，所得TPU則進一步與不同比例四乙基矽氧烷(Tetraethoxysilane; TEOS)混合，並藉由溶膠－凝膠法(Sol-gel process)製作TPU/矽氧(Silica)有機－無機混成材料(Hybrid)。由顯微結構觀測顯示，以TPU-B爲基質者，其無機相在混成材料薄膜中具備較佳之分散性；薄膜之拉伸試驗顯示，以TPU-A爲基質者，在2%TEOS添加量下具備最大之薄膜拉伸強度，而以TPU-B爲基質者，其薄膜之拉伸強度隨TEOS添加量增加而提高；動態熱機械分析(Dynamic mechanical analysis; DMA)顯示TPU/矽氧混成材料薄膜之玻璃轉移溫度約爲-55~-60℃，且隨著TEOS添加量增加，具備較高之儲存模數和較低的tan δ波峰高度；熱重分析(Thermogravimetric analysis; TGA)顯示添加較多之TEOS，其TPU/矽氧混成材料薄膜加熱至600℃時具備較高之重量保留率。

關鍵字

硬鏈段含量；有機－無機混成材料；溶膠－凝膠法；四乙基矽氧烷；熱塑型聚胺基甲酸酯

並列摘要

Thermoplastic polyurethane resins (TPU) that had 23.5% (TPU-A) and 27.5% (TPU-B) of hard segment content were synthesized from polytetramethylene ether glycol, 1,6-hexamethylene diisocyanate and 1,4-butanediol. These TPU resins were blended with various ratios of tetraethoxysilane (TEOS) to prepare TPU/silica organic-inorganic hybrids by sol-gel process. The electron microscopic image showed that using TPU-B resin as matrix had better dispersion of inorganic particles in hybrid films than that of TPU-A. Tensile testing showed that films that prepared with 2% of TEOS had the highest tensile strength when TPU-A was used. However, the tensile strength increased with increasing in TEOS ratio when TPU-B was used. Dynamic mechanical analysis (DMA) showed that TPU/silica hybrid films had the glass transition temperatures between -55℃ and -60℃. Increasing the ratio of TEOS resulted in higher storage modulus and lower peak height of tan δ. Thermogravimetric analysis (TGA) showed that TPU/silica hybrid films prepared with higher TEOS amount had higher char yield when heating to 600℃.

並列關鍵字

Hard segment content ； Organic-inorganic hybrids ； Sol-gel process ； Tetraethoxysilane ； Thermoplastic polyurethane

國際替代計量

溶膠－凝膠法製作熱塑型PU樹脂／矽氧有機－無機混成材料之性質

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