Abstract
Bisphenol-A polycarbonate (BAPC) crystal with unusual morphology is obtained in the solution-cast films of BAPC/plasticizer blends. It seems like Siamese twin spherulites, and owns a peanut-like morphology with more than one nucleating sites. Furthermore, concentric black dotted rings, which should be the aggregation regions of plasticizers, are also observed within the peanut-like crystals. The peanut-like morphology has no selectivity to the kinds of plasticizer and the casting temperature. The development of these peanut-like crystals is mainly ascribed to the local orientations of BAPC chains, which are induced by the concentration fluctuation during solvent evaporation and further fixed by the quick drying process. The concentric black dotted rings within the peanut-like crystals shall be attributed to the driving effect of BAPC crystalline lamellae and phase separation between plasticizers and BAPC. This work opens a new window for the regular arrangement of small molecules.
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