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

Abstract

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℃.