COPA/EVOH改性聚甲醛的研究  

EFFECTS OF COPA/EVOH ON THERMAL STABILITY OF POLYOXYMETHYLENE

作　　者：段怡飞[1] 李惠林[1] 

机构地区：[1]四川大学高分子研究所

出　　处：《高分子材料科学与工程》2005年第5期205-208,共4页Polymer Materials Science & Engineering

基　　金：国家863计划资助项目(2002AA333070)

摘　　要：采用220℃等温热降解、热重分析(TGA)分别研究了复合稳定剂COPA/EVOH在氮气和空气条件下对聚甲醛热稳定性的影响,借助Coats-R ed fernd方法对POM/COPA/EVOH体系进行了动力学分析。结果表明,COPA/EVOH能显著提高POM的分解温度,POM/COPA/EVOH体系的热降解符合一级反应规律,以POM/COPA/EVOH 48降解活化能最大。The effects of COPA/EVOH as compound stabilizers on the thermal stability of polyoxymethylene （POM） have been respectively evaluated both in nitrogen and air atmosphere by isothermal degradation at 220℃ and thermogravimetric analysis （TGA）. The kinetic parameters for POM/COPA/EVOH degradation were calculated from TG cures by Coats-Redfernd method. The results show that the degradation temperatures of POM can be obviously raised by compound stabilizer, in particularly lower amounts of COPA/EVOH can effectively achieve very good thermal stability. The thermal degradation of POM/COPA/EVOH follows the first-order kinetic relationship, among these POM/COPA/EVOH48 has the highest activation energy reaching 220. 19 kJ/mol in nitrogen which is three times the value of blank POM （77.74 kJ/mol） in nitrogen, and 530.37 kJ/mol in air which also exceeds the blank POM （354.59 kJ/mol） by fifty percent.

关 键 词：聚甲醛 聚酰胺 乙烯-乙烯醇共聚物 热重分析 热稳定性 

分 类 号：TQ326.51[化学工程—合成树脂塑料工业]