中国塑料

中国塑料 ›› 2013, Vol. 27 ›› Issue (02): 44-50 .DOI: 10.19491/j.issn.1001-9278.2013.02.009

• 材料与性能 • 上一篇    下一篇

聚甲醛/可反应性纳米SiO2复合材料的非等温结晶动力学及动态力学性能

张予东 郭莉萍 徐翔民 万榕 张治军   

  1. 河南大学化学化工学院 黄河水利职业技术学院机电工程系 河南大学特种功能材料重点实验室
  • 收稿日期:2012-09-17 修回日期:1900-01-01 出版日期:2013-02-26 发布日期:2013-02-26

Non-isothermal Crystallization Kinetics and Dynamic Mechanical Properties of Polyoxymethylene/Reactable Nano-SiO2 Composites

  

  • Received:2012-09-17 Revised:1900-01-01 Online:2013-02-26 Published:2013-02-26

摘要： 采用熔融共混法制备了聚甲醛(POM)/可反应性纳米二氧化硅(RNS)复合材料。通过差示扫描量热仪（DSC）研究了RNS对聚甲醛非等温结晶行为的影响；分别用修正Avrami 方程的Jeziorny法和Mo法研究了POM及其复合材料的非等温结晶动力学。结果表明，两种方法均能较好地描述复合材料的非等温结晶动力学, RNS的加入对POM结晶起到了异相成核作用，使得复合材料在较高的温度下即开始结晶，同时RNS又具有抑制结晶的作用，使得复合材料的结晶速率降低，半结晶时间t1/2增大。Avrami指数n有所降低,说明RNS改变了POM的结晶和生长过程。动态力学分析(DMA)研究结果表明, POM复合材料的储能模量也有所增加, Tg向高温方向移动,说明RNS与POM之间存在着较强的相互作用。

关键词: 聚甲醛, 纳米二氧化硅, 非等温结晶, 动态力学分析

Abstract: Polyoxymethylene/reactable nanoSiO2 (RNS) composites were prepared by melting blending. The nonisothermal crystallization behavior of POM and its composites were studied with differential scanning calorimetry (DSC) and the effect of nanoSiO2 was explored. Nonisothermal crystallization kinetics was described using Jeziorny and Mo methods. The RNS played a role of heterogeneous nucleation in the POM matrix, however, it resisted the diffusion of the segments. The net result was a lower crystallization rate  and longer crystallization halftime. The Avrami exponent n decreased, which indicated that RNS had changed the growth mechanism of POM. Dynamic mechanical analysis (DMA) indicated some improvements in the storage modulus with the addition of RNS. The tanδ peaks signifying the glasstransition temperature of POM shift to higher temperature, implying some strong interaction between nanoSiO2 and POM.

Key words: polyoxymethylene, nano silicon dioxide, non-isothermal crystallization, dynamic mechanical analysis

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