PTT树脂热分解稳定性研究  

Study on thermal decomposition stability of poly(trimethylene terephthalate) resins

作　　者：陈克权 周燕[2] 张飚[2] 

机构地区：[1]上海石化股份有限公司技术中心,上海200540 [2]上海石化股份有限公司合成纤维研究所,上海200540

出　　处：《聚酯工业》2004年第3期13-17,共5页Polyester Industry

摘　　要：研究了不同相对分子质量PTT树脂在氮气和空气 2种气氛中的热分解稳定性。结果表明 ,在氮气中 ,PTT树脂只有 1个热失重台阶 ,相对分子质量对于PTT热分解参数影响不大 ,相应的热分解温度分别为θdi为 3 82 .2～ 3 83℃ ,θmax为 3 99.3～40 3 .4℃ ,θdf为 418.1～ 419.0℃ ,总失重为 88.4%～ 88.7% ,这可以作为PTT热分解稳定性的表征。在空气中 ,PTT树脂存在2个热失重台阶 ,在第 1失重台阶中 ,θdi为 3 70 .9～ 3 75 .2℃ ,θmax为 40 3 .9～ 40 5 .5℃ ,θdf为 414 .7～ 416.0℃ ,样品的总失重为88.9%～ 89.8% ,可以作为PTT热氧化分解稳定性的表征 ;而在第 2失重台阶中 ,θdi为 461.8～ 472 .2℃ ,θmax为 473 .9～ 487.8℃ ,θdf为 480 .5～ 494.1℃ ,样品的总失重为 8.6%～ 9.7% ,第 2失重台阶是残留物进一步氧化燃烧过程的体现。在 2 60℃下 ,PTT在氮气和空气气氛中受热 60min后分别有 1.4%和 4.8%的热失重。说明PTT的热氧化分解稳定性较其热分解稳定性要差 ,但两者相差不大。The thermal decomposition stability of PTT resins with different molecular weights was studied in nitrogen and air, respectively. The results showed that PTT resins exhibited a thermo weight-loss process in nitrogen, which might correspond to the thermal degradation of PTT chains. The thermal degradation behavior of PTT in air was quite different from that in nitrogen, which exhibited two thermo weight-loss processes in air. The first decomposition process was produced by the degradation of polymer chains as that in nitrogen. And the second decomposition process was mainly caused by the thermo-oxidative degradation of the products formed during the first decomposition process. The first decomposition process in nitrogen and in air could be taken as the characterizations of the thermal degradation and thermo-oxidative degradation stabilities of PTT, respectively.

关 键 词：PTT 树脂 热稳定性 高分子材料 降解反应 聚合物 

分 类 号：TQ320[化学工程—合成树脂塑料工业]