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Morphology
Control of Polymers by Supercritical Carbon Dioxide
Hiromu SAITO
Department of Organic and Polymer Materials Chemistry,
Tokyo University of Agriculture and Technology
Nippon Gomu Kyokaishi,(2004),77(10),348-352 General Review in Japanese
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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