The thermal behavior of random copolymers of vinylidene chloride-methyl acrylate (VDC-MA) was monitored with differential scanning calorimetry. The effects of composition, annealing, and heating rate on the copolymer melting process were studied. Increasing levels of comonomer decreased the crystalline melting point and percent crystallinity of the copolymers. A combination of information obtained from heating rate and small-angle x-ray scattering studies led to a model of the melting behavior of PVDC and its copolymers. Apparently a simultaneous melting/recrystallization phenomenon occurs in these materials during heating.