The Preparation of Thermoplastic Polyurethane / Silica Hybrid by Sol-Gel Method

• Main Authors: Wang Chun Kai, 王俊凱
• Other Authors: Lai Sen Mao
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/20882820776968245067

碩士 === 中國文化大學 === 材料科學與製造研究所 === 90 === Abstract The purpose of the research is to synthesize TPU/SiO2 hybrid material by sol-gel technology, under the different catalysis systems (HCl and HOAc). Physical and mechanical properties of the hybrid material are analyzed. Transmittance spectra of hybrids with different SiO2 content show good optical property. SEM micrograph shows some nano-particulates in both systems, yet aggregates with 2~3 μm of order are still observed. The decomposition temperature is increased with the addition of SiO2 content. Storage modulus (E’) and loss tangent (tanδ) are also increased. The amplitude of tanδ decreases with increasing amounts of SiO2 indicating a relatively good interaction between TPU and SiO2. This interaction also is confirmed through the FT-IR spectra. The tensile strength of hybrids is slightly higher than that of TPU about 5∼16% depending on catalysis systems. On tearing test, that indicate pseudo crosslink from Silica tends to reduce energy dissipation, which causes the depression of fracture energy when compared with unfilled TPU. When the deformation is confined with a nano-scale via a cutting test, effect of SiO2 concentration on the fracture energy is not seen. Thus, the fracture energy is entirely governed by the creak tip diameter of razor blade