In this study,four kinds of rubber,natural rubber(NR),nitrile rubber(NBR),ethylene propylene diene monomer(EPDM),and acrylate rubber containing active chlorine(ACM)with different polarity and saturation were selected as the matrix rubber,and the dosage of carbon black N550 was 0,10,30,50 and 70 parts,and the low-temperature per-formance of sulfurized rubber filled with different amounts of carbon black was characterized by differential scanning calorimeter(DSC),low-temperature retraction tester and low-tem-perature brittleness testing machine.The corresponding low temperature performance of the three test methods is glass transition temperature(Tg),10％retraction corresponding tem-perature(TR10)and brittleness temperature(Tb).The results showed that the Tg and TR10 of polar rubber NBR and ACM changed greatly with the increase of carbon black dosage,while the Tg and TR10 of non-polar rubber NR and EPDM changed less,which was positively correlated with the content of binding glue.Although there is a saturation difference be-tween NBR and ACM,the Tg and TR10 changes are similar.Similarly,NR and EPDM also exhibit the same pattern,indicating that the saturation of rubber has no correlation with the effect of Tg and TR10 of rubber.The influence of carbon black filling amount on rubber Tb is diversified due to the difference of rubber types,which has nothing to do with the content of binding glue,and has no obvious relationship with the polarity and saturation of rubber,among which EPDM rubber shows the lowest brittle temperature and is much lower than its Tg.
关键词
橡胶/玻璃化转变温度/低温回缩温度/低温脆性温度
Key words
rubber/glass transition temperature/low temperature retraction temperature/low temperature brittleness temperature
维普
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