The effects of solvent type and concentration of C-60 on the crystallization of poly(L-lactide) (PLLA) during solvent evaporation, heating from room temperature, and cooling from the melt were investigated by polarized optical microscopy and differential scanning calorimetry. The addition Of C-60 enhanced the PLLA crystallization during solvent evaporation, during heating of the melt-quenched films, and during cooling from the melt of As-cast films, except for heating and cooling of the PLLA film with 1 wt % Of C-60 prepared with dichloromethane. In the case of solvent evaporation, the difference in crystallinity between the PLLA films with and without C-60 became higher for the solvent with a lower boiling point. In the case of heating of melt-quenched films, the addition Of C-60 had a small effect on the crystallinity of PLLA, whereas significantly lowered the peak top and ending temperatures of cold crystallization, except for melt-quenched PLLA film with 1 wt % Of C-60 prepared with dichloromethane. The crystallinity of PLLA was determined by the solvent type, rather than by the C-60 concentration. In the case of cooling from the melt of As-cast films, the addition Of C-60 elevated the crystallinity and cold crystallization temperature values of PLLA films, except for PLLA films prepared with dichloromethane. (c) 2007 Wiley Periodicals, Inc.