Abstract
High-pressure crystallized bisphenol-A polycarbonate (BAPC) samples were investigated using wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The results showed that BAPC chain-extended crystals with c-axis thickness around 2.0 μm were developed through the melt crystallization. Furthermore, a high-crystallinity BAPC sample with a wide variety of microstructures was obtained by a stepwise double-heat treatment at high pressure. In the sample, individual spherulites can be easily exposed and isolated with selective etching, which results in open porous microspheres. These spheres provide the possibility to study the spherulite structure in three dimensions. The open porous microspheres may have functional applications, such as catalyst support and for other surface active materials.
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