Thermal degradation kinetics of uncapped and end-capped poly(propylene carbonate)
Thermal degradation kinetics of uncapped and end-capped poly(propylene carbonate)
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DOI：
10.1016/s0141-3910(02)00395-6
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发表时间：
2003
影响因子：
5.9
通讯作者：
Shuwen Peng;Y. An;Cheng Chen;B. Fei;Yugang Zhuang;Li-song Dong
中科院分区：
文献类型：
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作者：
Shuwen Peng;Y. An;Cheng Chen;B. Fei;Yugang Zhuang;Li-song Dong
为了提高聚碳酸亚丙酯（PPC）的热稳定性，采用不同的活性剂对其进行封端。热重数据表明，未封端的PPC的降解温度低于封端的PPC。根据Chang的方法计算了未封端和封端PPC的热降解动力学参数。结果表明，在整个降解温度范围内，未封端的PPC的不同机制运作。在第一阶段，链解压缩主导降解。随着温度的升高，发生竞争性多步反应。在最后阶段，无规断链在降解中起重要作用。对于封端PPC，随机断链主导整个降解过程。
In order to improve its thermal stability, poly(propylene carbonate)(PPC) was end-capped by different active agents. Thermogravimetric data show that the degradation temperature of uncapped PPC was lower than that of end-capped PPC. The kinetic parameters of thermal degradation of uncapped and end-capped PPC were calculated according to Chang's method. The results show that different mechanisms operate during the whole degradation temperature range for uncapped PPC. In the first stage, chain unzipping dominates the degradation. With increasing temperature, competing multi-step reactions occur. In the last stage, random chain scission plays an important role in degradation. For end-capped PPC, random chain scission dominates the whole degradation process.