Temperature-dependent polymorphic crystallization of poly(l-lactide)s on the basis of optical purity and microstructure

The critical temperatures (Tα/α′) for the formation of α and α′ crystal modifications of PLLAs with different optical purities were obtained by WAXD and DSC, respectively. It was found that the Tα/α′ declined by about 10 °C for every 2-3% decrease in optical purity.129