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首页> 外文期刊>Journal of Applied Polymer Science >Thermal Properties and isothermal Crystallization of Syndiotactic Polypropylenes: Differential Scanning Calorimetry and Overall Crystallization Kinetics
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Thermal Properties and isothermal Crystallization of Syndiotactic Polypropylenes: Differential Scanning Calorimetry and Overall Crystallization Kinetics

机译：间规聚丙烯的热性质和等温结晶：差示扫描量热法和整体结晶动力学

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摘要

Isothermal crystallization and subsequent melting behavior of five samples of syndiotactic polypropylene are presented. Crystallization studies were carried out in the temperature range of 60degC to 97.5degC using a differential scanning calorimeter (DSC). Subsequent DSC scans of isothermally crystallized samplex exhibited double melting endotherms. The high melting peak was concluded to be the result of the melting of crystals formed by recrystallization during the reheating process. Overall crystallization kinetics was studied based on the traditional Avrami analysis. Analysis of crystallization times based on the modified growth rate theory suggested that, within the crystallization temperature range studied, the syndiotactic polypropylenes crystal-lize in regime III. Kinetic crystallizability parameters also were evaluated, and were found to be in the range of 0.41degC s~(-1) to 2.14degC s~(-1).
机译：介绍了五个间规聚丙烯样品的等温结晶和随后的熔融行为。使用差示扫描量热仪（DSC）在60°C至97.5°C的温度范围内进行了结晶研究。等温结晶的样品的后续DSC扫描显示出双熔化吸热。结论是高熔化峰是在再加热过程中通过重结晶形成的晶体熔化的结果。基于传统的Avrami分析研究了整体结晶动力学。基于改进的生长速率理论的结晶时间分析表明，在研究的结晶温度范围内，间规聚丙烯在方案III中结晶。还评估了动力学结晶性参数，发现其在0.41℃s〜（-1）至2.14℃s〜（-1）的范围内。

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