Abstract
We found characteristic morphologies of polymers having various shape and size by annealing under supercritical carbon dioxide. Mosaic crystals consisting of regularly arranged straight and thick lamellae were obtained in polypropylene by crystallization under supercritical carbon dioxide due to local ordering in the melt state. On the other hand, interconnected porous structure was obtained by liquid-liquid phase separation of polycarbonate and supercritical carbon dioxide via spinodal decomposition. Nano-porous structure with various shape of layer type and network one was also obtained by annealing polypropylene/clay nanocomposite, polyethylene, aramid, and polyimide gel under supercritical carbon dioxide.

Keywords:
Supercritical carbon dioxide, Crystallization, Phase separation, Composite, Porous material

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