| 天然橡胶老化过程中的结构和性能变化及储存寿命预测 |
| Change in Structure and Property of NR during Aging and Its Storage Life Prediction |
| 投稿时间：2018-04-12 修订日期：2018-04-12 |
| DOI：10.12136/j.issn.1000-890X.2019.07.0495 |
| 中文关键词: 天然橡胶 老化 储存寿命 核磁共振 交联密度 Arrhenius方程 |
| 英文关键词: NR ageing storage life nuclear magnetic resonance crosslinking density Arrhenius equation |
| 基金项目:国家自然科学基金资助项目（51243007） |
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| 中文摘要: |
| 采用核磁法交联密度测定仪测定天然橡胶（NR）硫化胶交联密度，研究老化过程中NR硫化胶的结构和性能变化，并利用Arrhenius方程预测NR硫化胶在常温下的储存寿命。结果表明：随着老化时间延长和老化温度升高，NR硫化胶的纵向弛豫时间和横向弛豫时间均缩短；弛豫函数中高斯部分（网链部分）质量分数减小，弛豫函数中指数部分（自由悬挂链末端及活动性强的小分子等部分）质量分数增大；采用Arrhenius方程预测NR硫化胶在常温下拉伸强度保持75%时的储存寿命约为25年。 |
| 英文摘要: |
| 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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