半芳香共聚酰胺的合成和热稳定性的研究-1.pdfVIP

2009 年第67 卷 化 学 学 报 Vol. 67, 2009 第9 期, 983～988 ACTA CHIMICA SINICA No. 9, 983～988 ·研究论文· 半芳香共聚酰胺的合成及热稳定性的研究 程晓敏* 汪乐春 吴珊珊 (安徽大学化学化工学院 合肥 230039) 摘要 采用熔融缩聚法, 合成了长碳链聚酰胺(PA1212)与聚对苯二甲酰十二碳二胺(PA12T) 的新型半芳香共聚酰胺, 用FTIR, 1H NMR 和DSC 对产物结构进行了表征. 通过热重分析研究了共聚酰胺在N2 气氛中以不同升温速率β升温时 的热降解过程与机理. 结果表明PA1212/12T 的降解为一步过程, 随着β 的增大, 平衡降解温度线性升高. 用Kissinger 和Flynn-Wall-Ozawa 两种方法求得PA1212/12T 的热降解表观活化能分别为126.9 和127.9 kJ/mol. 用Coats-Redfern 法 证明了PA1212/12T 的热降解机理为Deceleration 类型中的R1 或F3 降解机理. 关键词 聚酰胺1212; 聚对苯二甲酰十二碳二胺; 活化能; 热降解机理 Semi-aromatic Copolyamide: Synthesis and Thermal Stability Cheng, Xiaomin* Wang, Lechun Wu, Shanshan (College of Chemistry and Chemical Engineering, Anhui University , Hefei 230039) Abstract Poly(dodecamethylene dodecanamide/dodecamethylene terephthalamide) copolymer, a new semi-aromatic copolyamide PA1212/12T, was synthesized by melting copolycondensation. The structures of 1 products were characterized by FTIR, H NMR and DSC. The decomposition processes and mechanism of PA1212/12T in Nitrogen has been studied by thermogravimetry. It was found that the thermal degradation process of PA1212/12T was one-step reaction. The degradation temperature increased linearly with the in- creasing of the heating rate β. The values of activation energy obtained by Kissinger and Flynn-Wall-Ozawa kinetic methods were 126.9 and 127.9 kJ/mol. Analysis of experimental results indicated that the actual re- action mechanism was deceleration type R or F according to Coats-Redfern method.