松香型成核剂成核聚丙烯的非等温结晶动力学研究

Study on Non-Isothermal Crystallization Kinetics of Rosin Type Nucleating Agent Filled Polypropylene

采用 DSC 法研究了聚丙烯(PP)和松香型成核剂成核 PP 在不同的降温速率下的非等温结晶动力学。采用修正的 Avrami 方程对 DSC 的测试结果进行了分析。结果表明,松香型成核透明剂和分散剂能显著提高 PP 的结晶温度,用 Jeziorny 法来处理松香型成核 PP 的非结晶等温结晶行为是较为吻合的。加入松香型成核透明剂和分散剂后,PP 的半结晶时间减少,结晶动力学常数 Z_c 增加,结晶速率增加;同一降温速率,松香型成核透明剂和分散剂成核PP 的 n 值较纯 PP 减少,说明结晶成核方式发生了改变。

The non-isothermal crystallization of polypropylene （PP） with or without a rosin type nucleating agent was studied using differential scanning ealorimetry（DSC）. The result shows that the crystallization temperature of PP filled rosin type nucleating agent can be improved. The analysis using Jeziorny methods showed that Zc and t1/2 decreased with the introduction of nucleating agent and dispersant. The Avrami index n was also changed indicating a somewhat different nucleation mechanism.