POM与POM/TPU共混物非等温结晶动力学的研究  

Non-isothermal Crystallization of Polyoxymethylene and Blends of Polyoxymethylene and Thermoplastic Polyurethane

作　　者：张青兰[1] 郝玉英[1] 

机构地区：[1]太原理工大学理学院物理系,山西太原030024

出　　处：《中国塑料》2008年第11期33-37,共5页China Plastics

基　　金：国家自然科学基金项目(20671068);教育部科学技术重点项目(207015);山西省科技攻关项目(2006031121);太原市科技局明星专项(07020401)

摘　　要：利用差示扫描量热仪对聚甲醛(POM)非等温结晶动力学进行了研究,并考察了热塑性聚氨酯弹性体(TPU)的加入对 POM 结晶动力学的影响。通过几种理论模型分析了非等温结晶数据。结果表明,Jeziorny 法、莫志深法能够成功描述 POM 及 POM/TPU 共混体系的非等温结晶过程。POM 的 Avami 指数 n 稍大于 POM/TPU 共混物的。半结晶时间 t_(1/2)与动力学速率参数 Z_C 的值表明 POM 与 POM/TPU 共混物的结晶速率随冷却速率的增加而增大,但相同冷却速率下 POM 的结晶速率要快于 POM/TPU 共混物。由 Kissinger 法估算的 POM与 POM/TPU 共混物的活化能分别为513.5、390.5 kJ/mol。A kinetic study was performed on the crystallization of polyoxymethylene （POM） and POM/ thermoplastic polyurethane （TPU） blends by means of differential scanning calorimetry at various cooling rates. Several theoretical models were applied to analyze the process. It showed that Jeziorny and Mo＇s treatment described well the non-isothermal crystallization of POM and POM/TPU blends. The Avrami exponent n of POM/TPU blend is slightly smaller than that of POM. The values of half-time t1/2 and Zo showed that the crystallization rate increased with increasing cooling rates for both POM and POM/TPU blends, with the crystallization rate of POM/TPU blend being lower than that of neat POM. The activation energies were estimated by Kissinger method to be 513.5 and 390.5 kJ/mol for neat POM and POM/TPU blends, respectively.

关 键 词：聚甲醛 热塑性聚氨酯弹性体 非等温结晶 结晶动力学 共混 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]