Abstract
We herein report the effects of the component ratio and method of blending on the synthesis of stereocomplex poly(lactic acid) (SC-PLA) based on poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) prepolymers. PLLA and PDLA were prepared by direct melt polycondensation of lactic acid (DMP). Combined with the dual catalyst system, PLA prepolymers with Mw more than 20,000 were prepared by DMP. PLLA was mixed by powder blending or melt blended with PDLA. It is revealed that melt-point and spherulite growth rate of SC-PLA is strongly dependent on the perfection of SC structure. The melt point of PLA can be increased by nearly 50 °C because of the particular strong intermolecular interaction between PLLA and PDLA chains. Solid-state polycondensation (SSP) is an efficient method to increase the molecular weight of SC-PLA, but it can have a negative effect on the regularity of linear chains of SC-PLA. Thermogravimetry analyzer (TGA) results show that SC structure cannot cause the delay reaction on the thermal degradation of PLA.
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