溴化丁基橡胶液体抗氧剂的热分析研究

用热失重法(TG)和差示扫描量热法(DSC)分别测定了添加4种新型液体抗氧剂的溴化丁基橡胶(BIIR)的热失重温度、氧化诱导时间和氧化诱导温度,综合考察了4种抗氧剂的热稳定性和抗氧化性能,评选出性能最好的抗氧剂及其最佳添加量,并分别计算了BIIR的等温和非等温(动态)热氧化反应的活化能。结果表明,4种抗氧剂的热稳定性和抗氧化效果差异较大,但均能不同程度改善BIIR热氧化稳定性。等温热氧化动力学实验结果表明,BIIR热氧化反应符合阿伦尼乌斯方程,抗氧剂添加前后BIIR等温氧化反应活化能分别为131.14kJ/mol、150.25kJ/mol;动态热氧化动力学实验得到抗氧剂加入前后BIIR的非等温氧化反应活化能分别为86.23kJ/mol和108.49kJ/mol。

Thermal analysis study of liquid antioxidant in brominated butyl rubber

Using the thermo-gravimetric（TG）and differential scanning calorimetry（DSC）,we determined the thermal decomposition temperature,oxidation induction period（isothermal OIT）and the oxidation induction temperature（dynamic OIT）of brominated butyl rubber（BIIR）added four kinds of liquid antioxidant.And we made comprehensive examination of their thermal stability and oxidation resistance,then selected the best antioxidant and it＇s optimum adding amount.And the activation energy of BIIR＇s isothermal and non-isothermal（dynamic）thermal oxidation reaction was calculated.The results showed that the thermal stability and the oxidation resistance of four kinds of antioxidant were different,however they all could improve BIIR＇s thermal oxygen stability at different levels.And the kinetics of oxidation experiments showed that BIIR＇s thermal oxidation reaction was in line with the Arrhenius equation,and the isothermal thermal oxidation activation energy of BIIR added antioxidant before and after was 131.14kJ/mol and 151.59kJ/mol,respectively.The dynamic thermal oxidation activation energy of BIIR added antioxidant before and after was 86.23kJ/mol and 108.49kJ/mol,respectively.