中国塑料

中国塑料 ›› 2016, Vol. 30 ›› Issue (09): 14-20 .DOI: 10.19491/j.issn.1001-9278.2016.09.003

• 材料与性能 • 上一篇    下一篇

共聚甲醛的自成核结晶行为

张予东,廖颖玲,高芸,常海波   

  1. 河南大学化学化工学院
  • 收稿日期:2016-05-11 修回日期:2016-07-07 出版日期:2016-09-26 发布日期:2016-09-26

Effect of Self-nucleation Process on Crystallization Behavior of Polyxymethylene

  • Received:2016-05-11 Revised:2016-07-07 Online:2016-09-26 Published:2016-09-26

摘要： 采用自成核的方法研究了共聚甲醛（POM）的结晶过程、结晶行为及其形态结构。结果表明，POM的有效自成核温度（Ts）区间为165.5～167 ℃；POM经自成核处理后可在144～148 ℃内迅速结晶，相对其在210 ℃熔融后的结晶温度（Tc）最大提高了5 ℃；在150～154 ℃内自成核处理后的样品随着等温Tc的升高，结晶速率（G）变慢；根据Arrhenius方程和LauritzenHoffman方程可获得样品的各项动力学参数，通过对比发现，自成核处理可有效提高POM的Tc和G；POM经自成核处理后晶型未发生变化，且微晶尺寸细化，球晶尺寸变小；自成核处理可有效促进POM的结晶。

关键词: 共聚甲醛, 自成核, 结晶行为, 结晶动力学

Abstract: The effect of self-seeding nucleation during the crystallization of polyxymethylene(POM) was studied. It showed that the suitable temperature scope for self-seeding nucleation of POM was 165.5 to 167 ℃.The crystallization temperature of POM increased obviously(about 5 ℃) after the self-seeding nucleation. Additionally, the parameters for Avrami and Lauritzen-Hoffman equations were calculated. The test of polarized light microscopy (PLM) showed that the spherulite size decreased markedly. All of the results prove that self-seeding nucleation technique could improve the nucleation efficiency of POM，reduced its crystal particle size, and improved its crystallization temperature and rate.

Key words: polyxymethylene, self-seeding nucleation, crystallization behavior, crystallization kinetics

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