Abstract
A series of asymmetric biodegradable poly(l-lactide) (PLLA)/poly(d-lactide) (PDLA) blends with low PDLA compositions was prepared using a solution blending method. The formation of stereocomplex (SC) crystallites in PLLA/PDLA blends was evidenced by differential scanning calorimetry (DSC), as indicated by the melting point of SC crystallites being about 50 °C higher than that of PLLA homocrystallites. Isothermal crystallization kinetics under shear conditions at the specific high temperature of 160 °C for the PLLA/PDLA blends was investigated using polarized optical microscopy (POM) and rheometry. It was found that the crystallization process of PLLA in the blends was greatly accelerated under shear conditions due to the existence of SC crystallites and the crystallization kinetics of PLLA was promoted with increasing shear rate or shear time. The crystalline morphology remained spherulitic with the spherulitic growth rates unaltered at the applied shear conditions, and the accelerated crystallization kin...
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