Abstract
The effect of the CO2-induced mesophase on the isothermal crystallization of poly(l-lactide) (PLLA) was investigated by infrared (IR) spectroscopy and microscopy. It was found that the crystallization rate of PLLA was significantly enhanced by the CO2-induced mesophase, showing that the crystallization was completed even in a short period of 100–101 s. Compared with the directly crystallized samples that showed typical spherulites with lamellae, the crystallization via CO2-induced mesophase led to nonspherulitic (granular or featureless) morphologies consisting of nanorods, whereas the polymorphic behavior remained unaffected by the initial state, resulting in crystallized PLLA containing identical polymorphs of uniquely different nanostrutured morphologies and superstructures. The IR imaging results indicated that the formation of the equilibrium crystal was preceded by the formation of various metastable intermediate phases, including mesomorphic phase, preordering, and metastable crystal, all of which ...
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