| Change in Structure and Property of NR during Aging and Its Storage Life Prediction |
| Received:April 12, 2018 Revised:April 12, 2018 |
| DOI：10.12136/j.issn.1000-890X.2019.07.0495 |
| Key Words: NR；ageing；storage life；nuclear magnetic resonance；crosslinking density；Arrhenius equation |
| Author Name | Affiliation | E-mail | | YUAN Zhaokui* | Qingdao University of Science and Technology | 963592012@qq.com | | LI Lingli | Jiangxi Jinlilong Rubber Track Co. ，Ltd | | | CHEN Tao | Jiangxi Jinlilong Rubber Track Co. ，Ltd | | | XIAO Jianbin* | Qingdao University of Science and Technology | 963592012@qq. com |
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| Abstract: |
| The crosslinking density of natural rubber（NR） vulcanizate was measured by nuclear magnetic resonance crosslinking densitometer，the structure and propertiy changes of NR vulcanizate during the aging were investigated，and Arrhenius equation was used to predict the storage life of NR vulcanizate at normal temperature.The results showed that，with the prolongation of aging time or the increase of aging temperature，the longitudinal relaxation time and transverse relaxation time of NR vulcanizate were shortened，the mass fraction of Gaussian part（the network chain part） in the relaxation function decreased，and the mass fraction of middle index part（the end of the free hanging chain and the small molecule with high activity） in the relaxation function increased.The storage life of NR vulcanizate at normal temperature with 75% tensile strength predicted by Arrhenius equation was about 25 years. |
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