【摘 要】
：
Poly(lactic acid)(PLA)has attracted much attention in recent years,due to its biodegradability,biocompatibility,and good processibility.However,the PLA mate
【机 构】
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State Key Laboratory of Chemical Engineering,Department of Chemical and Biological Engineering,Zheji
【出 处】
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The 11th International Symposium on Polymer Physics(PP2014)(
论文部分内容阅读
Poly(lactic acid)(PLA)has attracted much attention in recent years,due to its biodegradability,biocompatibility,and good processibility.However,the PLA material has low thermal-resistant temperature,which has limited its wide application.Stereocomplexed PLA(sc-PLA)has a melt temperature of ca.230 ℃,which is 50 ℃ higher than the conventional PLA material.Therefore,stereocomplex crystallization of poly(L-lactic acid)(PLLA)and poly(D-lactic acid)(PDLA)has been considered as a promising method to improve the thermal and mechanical properties of PLA-based polymers.However,the stereocomplex crystallization just takes place in the PLLA/PDLA enantiomeric blends with the low molecular weights.For the high-molecular-weight PLLA/PDLA blends,only the homo-crystals with lower melting point were formed.In this study,we proposed several methods such as block copolymerization,miscible blending,hydrogen-bonding interactions,and heterogeneous nucleation to promote the stereocomplex crystallization and diminish the homo-crystallization of high-molecular-weight PLAs.
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