Study on the Toughening of Polylactic acid by Thermoplastic polyurethane and Poly(butylene succinate)

• Main Authors: Hsi-Ling Liao, 廖希翎
• Other Authors: Tien-Wei Shyr
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/15292544638816930260

碩士 === 逢甲大學 === 紡織工程所 === 98 === This study focused on miscibility, phase morphology, and mechanical properties of a series of Polylactic acid/ Thermoplastic polyurethane/ Poly(butylene succinate) blends. Thermal behavior was analyzed by thermal gravimetric analyzer (TGA), differential scanning calorimeter (DSC) and dynamic mechanical analyzer (DMA). Mechanical properties were investigated by universal material testing machine. Blend morphology was observed by scanning electron microscopy. TGA showed that the initial degradation temperature decreased when TPU or PBS were added to PLA. And DSC results showed that the TPU and PBS could accelerate the crystallization rate of PLA. DMA results showed that the blends were immiscible. Otherwise, the compatibility of PLA and PBS was better than PLA and TPU, so the phase separation also could be observed in the liquid nitrogen fracture surface by SEM. With regard to mechanical properties, the elongation at break significantly increased when TPU and PBS were added to PLA, and the elongation at break exceeded 190% in the three component blends, indicating the brittle property of the material was transformed into ductile. The tensile fracture surface of blends was also observed by SEM.