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首页> 外文期刊>Journal of Applied Polymer Science >Crystalline memory effects in isothermal crystallization of syndiotactic polypropylene
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Crystalline memory effects in isothermal crystallization of syndiotactic polypropylene

机译：间规聚丙烯等温结晶中的晶体记忆效应

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摘要

Isothermal crystallization behavior after partial or complete melting of syndiotactic polypropylene was investigated by differential scanning calorimetry (DSC). On partial melting, the total concentration of predetermined nuclei was found to decrease with increasing fusion temperature and increasing time period that the sample spent at a specific fusion temperature. A significant effect of the rate of heating to the fusion temperature was also observed. On complete melting, the total concentration of predetermined nuclei was found to approach a constant value, which is the concentration of infusible heterogeneous nuclei (e.g., impurities, catalyst residues) present originally in the sample. At a specific fusion temperature, the concentration of predetermined athermal nuclei was found to decrease exponentially with the time period spent in the melt. (C) 2000 John Wiley & Sons, Inc. [References: 18]
机译：用差示扫描量热法（DSC）研究间同立构聚丙烯部分或完全熔融后的等温结晶行为。在部分熔融时，发现预定核的总浓度随熔融温度的升高和样品在特定熔融温度下所用时间的增加而降低。还观察到加热速率对熔融温度的显着影响。在完全熔化时，发现预定核的总浓度接近恒定值，该恒定值是最初存在于样品中的不溶性异核（例如，杂质，催化剂残留物）的浓度。在特定的熔化温度下，发现预定的无热核的浓度随在熔体中花费的时间呈指数下降。 （C）2000 John Wiley＆Sons，Inc. [参考：18]

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