| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 98 === In this study, organic environmental polymer (PLLA) and new-type textile polymer (PTT) and thermoplastic elastomer (SEBS) were melt-mixed in brabender. The isothermal and nonisothermal crystallization behavior of Poly(L-lactic acid) (PLA) and Poly(Trimethylene Terephthalate) (PTT) blends were investigated with differential scanning calorimetry (DSC). Differential scanning calorimetry (DSC) nonisothermal experiment showed that PLA glass temperature were shift to low temperature when SEBS was added. In isothermal crystallization, the Avrami equation was applied to describe the kinetics of the crystallization in the temperature range of 190~200℃. From isothermal-crystallization analysis, the crystallization rate of PTT were decrease when SEBS was added. Thermal gravimetric (TGA) result showed that the residue of PLA and weight loss temperature was improved with the increase of PTT and SEBS.
We also used scanning electron microscopy (SEM) to observe miscibility of each blend, and used polarized-light microscopy (POM) to observe the melt crystallization of PTT after addition of SEBS. In PLA-rich blend, elongation was increased by adding SEBS. In PTT-rich blend, tensile strength was decreased, but elongation was increased when SEBS was added.
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