Morphology Control and Performance of Crystalline Polymers by drawing under Supercritical Fluids

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We designed a tensile testing system in which we can measure the stress-strain behavior of polymer films under supercritical fluids. The crystalline polymers were plasticized and the drawability was improved under supercritical CO_2. Polymer materials with various properties could be obtained by drawing under CO_2 at various temperatures and CO_2 pressures. Crystallinity and melting temperature of polypropylene were increased by drawing at high temperature under supercritical CO_2, while nano-ordered voids were formed and the density decreased by drawing at low temperature under CO_2. The progress of the characteristic morphologies thus obtained was discussed by the results of small-angle x-ray scattering and electron microscope.