Process analysis of phase transformation of α to β-form crystal of syndiotactic polystyrene investigated in supercritical CO2 |
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Authors: | Xia Liao Jian Yu |
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Affiliation: | Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Science, Beijing 100080, China |
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Abstract: | Mechanism of solid phase transformation of α to β form crystal of syndiotactic polystyrene (sPS) was investigated in supercritical CO2. The phase transformation occurred in the original pure α and mixed (α+β) form sPS in supercritical CO2 was traced as a function of temperature and pressure by means of wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC). At appropriate temperature and pressure, sPS underwent solid phase transitions from α to β form. Higher temperature or higher pressure favored this transformation. Compared to the original pure α form sample, the original β form crystal in the mixed (α+β) form sample acted as the nucleus of β form crystal, so that reduced the transition temperature and pressure. |
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Keywords: | Solid phase transition Syndiotactic polystyrene Supercritical CO2 |
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