| Kinetics of reversion process in NR vulcanization |
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| DOI： |
| Key Words: NR；reversion；vulcanization kinetics；nonlinear fitting |
| Author Name | Affiliation | | HUANG Chen | Shanghai Jiaotong University | | FAN Ru-liang | Shanghai Jiaotong University | | ZHANG Yong | Shanghai Jiaotong University | | ZHANG Yin-xi | Shanghai Jiaotong University |
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| Abstract: |
| The computer-aided nonlinear fitting for the curing curves of NR compounds in sulfur vulcanization and semi-efficient vulcanization at different temperatures was made by using the model for kinetics of vulcanization reversion based on the reversion mechanism of sulfur cured NR vulcanizate to obtain the velocity constants in various reaction steps，the sum of single sulfide bonds，double sulfide bonds and polysulfide bonds，and the crosslinking density as a function of the curing time.The results showed that the simulated curves of two curing systems at different temperatures were fitted to the measured data，and the obtained relationship between the velocity constant and the curing temperature of the same system was in accordance with the Arrhenius equation.The reversion increased as the temperature rose，which could be explained by the fact that the activating energies of the polysulfide bond cracking for both systems were greater than those of the devulcanization. |
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