Formation of β-crystal from nonisothermal crystallization of compression-molded isotactic polypropylene melt |
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Authors: | Yonggang Shangguan |
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Institution: | Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, PR China |
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Abstract: | The crystalline structures of isotactic polypropylene (iPP) subjected to compression-molding were studied by means of differential scanning calorimeter (DSC), optical microscope (OM) and wide-angle X-ray diffraction (WAXD). β-crystal can be formed from nonisothermal crystallization of the sample compression-molded at the molten state and the β-phase content increased with increasing pressure of molding. Thermal treatment of the molten sample at 200 °C could eliminate the effect of compression-molding on crystalline structure. It was suggested that the compression-molding of iPP melt plays an important role in improving the nucleation ability of β-crystal. |
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Keywords: | Crystal structure Compression-molding Isotactic polypropylene (iPP) |
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