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Thermal degradation kinetics and mechanism of epoxidized natural rubber

文献类型： 外文期刊

作者： He, Canzhong 1 ; Wang, Yueqiang 2 ; Luo, Yongyue 2 ; Kong, Lingxue 1 ; Peng, Zheng 1 ;

作者机构： 1.Deakin Univ, Inst Frontier Mat, Waurn Ponds, Vic 3216, Australia

2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Zhanjiang 524001, Peoples R China

3.Hainan Univ, Coll Agr, Haikou 570228, Peoples R China

关键词： epoxidized natural rubber;kinetics;mechanism;thermal degradation

期刊名称：JOURNAL OF POLYMER ENGINEERING （ 影响因子：1.367； 五年影响因子：1.433 ）

ISSN： 0334-6447

年卷期： 2013 年 33 卷 4 期

页码：

收录情况： SCI

摘要： Thermal resistance is one of the most dominative properties for polymer materials. Thermal degradation mechanisms of epoxidized natural rubber (ENR) and NR are studied by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results show that, the introduction of epoxy groups into the NR molecular main chain leads to a remarkable change in the degradation mechanism. The thermal stability of ENR is worse than that of NR. For the first thermooxidative degradation stage, the thermal decomposition mechanism of ENR is similar to that of NR, which corresponds to a mechanism involving one-dimensional diffusion. For the second stage, the thermal decomposition mechanism of ENR is a three-dimensional diffusion, which is more complex than that of NR. Kinetic analysis showed that activation energy (E-alpha), activation entropy (Delta H) and activation Gibbs energy (Delta G) values are all positive, indicating that the thermooxidative degradation process of ENR is non-spontaneous.

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