Thermal Decomposition of Brominated Butyl Rubber.

Wei Zhang,Yanli Lu,Yang Zang,Shengyun Zhao,Weisheng Lin,Jinping Xiong

doi:10.3390/ma14226767

Abstract

The thermal decomposition of brominated butyl rubber under air atmosphere was investigated by thermogravimetry (TG) and derivative thermogravimetry (DTG) at various heating rates. The kinetic parameters were evaluated by TG and the isoconversional method developed by Ozawa. One prominent decomposition stage was observed in the DTG curves at high heating rates, while an additional small peak was observed at low heating rates. The apparent activation energy determined using the TG method ranged from 219.31 to 228.13 kJ·mol−1 at various heating rates. The non-isothermal degradation was found to be a first-order reaction, and the activation energy, as determined by the isoconversional method, increased with an increase in mass loss. The kinetic data suggest that brominated butyl rubber has excellent thermal stability. This study can indirectly aid in improving rubber pyrolysis methods and in enhancing the heat resistance of materials.

Highlights

Fujian Provincial Key Laboratory of Ecological Industry Green Technology, Mount Wuyi, Abstract: The thermal decomposition of brominated butyl rubber under air atmosphere was investigated by thermogravimetry (TG) and derivative thermogravimetry (DTG) at various heating rates
Research on the thermal oxidative degradation of BIIR has gained significant attention. This is because BIIR is prone to degradation during long-term use in heat-resistant products, and the study of its performance degradation upon thermal decomposition can aid in developing methods to improve its thermal aging properties
To determine the activation energy E of BIIR decomposition more accurately, an isoconversional method developed by Ozawa [19] was used

Summary

Raw Materials

(55), sulfur (1), paraffin oil (1), stearate ing ingredients (phr) were BIIR (100), carbon black N660 (55), sulfur (1), paraffin oil (1),. (1.5), zinc(1.5), oxide (6), and (6), magnesium oxide (2).

Specimen Preparation

Thermal Decomposition

TGDTGMethod

TG Method

Lifetime of Thermal

Conclusions