Miscibility and mechanical properties of SEBS/polylactide elastomer blends
Melt blending of poly(ethylene/butylenes)-b-polystyrene copolymer (SEBS) and polylactide (PLA) has been performed in an effort to toughen PLA. PLA was mixed with SEBS from 5% to 30% (w/w). Dynamic Mechanical Analysis (DMA) was carried out. The Tg of both SEBS and PLA shifted toward each other when the blends ratios were varied, suggesting that SEBS and PLA were partially miscible. The neat PLA was very brittle and its elongation at break was only 5%. Mechanical properties of blends with different SEBS concentrations were observed. With the SEBS contents increasing, the elongation at break of blends increased and the brittle break became ductile break. The toughening effect implied an energy-dissipation process for a rubber-toughened plastic system. It was confirmed that as SEBS elastomer dispersed in PLA matrix, SEBS acted as stress concentrators upon being subjected to the tensile test and led to triaxial stress locally released and energy dissipated.
ZHANG Wei WEI Fayun CHEN Long ZHANG Yu
State Key Laboratory for Modification of Chemical Fiber and Polymeric Materials, College of Material Science and Engineering, Donghua University, Shanghai, 201620, P.R.China
国际会议
2009 International Conference on Advanced Fibers and Polymer Materials(2009年先进纤维与聚合物材料国际学术会议)
上海
英文
207-209
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）