Abstract
We discuss the enhancement in miscibility of crystalline/crystalline blends of poly(butylene succinate) and poly(ethylene succinate) (PBS/PES) by simple melt annealing, their crystallization process and the formation of characteristic phase-separated structure. The immiscible PBS/PES blends changed into miscible blends when annealed at 150 °C. Gel permeation chromatography and differential scanning calorimetry measurements suggested that the annealing process caused transesterification between the PBS and PES, resulting in the formation of PBS–PES copolyesters. The unannealed blends exhibited phase-separated melts with constituents that crystallized separately. A PBS-rich layer was formed between the PES-rich phase and the glass substrate from the phase-separated melts of the unannealed blends. In contrast, the miscible annealed blends crystallized by two distinct processes. The first process, successive crystallization, involved PBS spherulite formation in the homogeneous melt and PES spherulite nucleation inside the PBS spherulites. The second process involved the simultaneous nucleation of both components from the melt and penetrating growth of the PES spherulites into the PBS spherulites.
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