| Summary: | 碩士 === 崑山科技大學 === 材料工程研究所 === 104 === TPEE/ADR/SiO2 composites were fabricated through directly compounding thermoplastic polyester elastomers (TPEE) with the chain extender (JONCRYL ADR-4368C，BASF) and silica nanoparticles using twin-screw extruder. The performances of these composites were estimated using Instron universe testing machine, differential scanning calorimeter (DSC), dynamic mechanical analyzer (DMA), etc. The results showed that blending TPEE with chain extender (TPEE/ADR) increased the ultimate tensile strength (UTS) and elongation at break (εb) but decreased and Young’s modulus (E) of the composites. However, addition of silica nanoparticles into the TPEE/ADR blends made the value of E lower, as compared with that of the neat TPEE. The dynamic mechanical testing showed that both ADR and SiO2 increased the glass transition temperature, storage modulus, but damping factor kept no significant difference. Regarding the rheology analysis and melt flow index of the TPEE/ADR/SiO2 composites, ADR increased the viscosity of the TPEE/ADR/SiO2 composites, but inclusion of SiO2 did little effect on the viscosity of the composites. For the nonisothermal crystallization determination, inclusion of ADR increased the crystallinity of the composites until the ADR content reached to 0.7 phr, and the TPEE/ADR 0.7 phr the crystallinity reached a maximum value. Even the ADR content reaching 0.9 phr, the crystallinity of TPEE increased little. However, the addition of SiO2 made the crystallinity of TPEE lower. Blending TPEE with ADR increased significantly the rate of nonisothermal crystallization under slow cooling rate compared with that of the neat TPEE, might be due to the effect of heterogeneous nucleation. However, it was oppsite under high cooling rate. On the other hand, the inclusion of SiO2 nanoparticles did little effect on the rate of crystallization.
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