热带作物学报2017，Vol.38Issue(4)：716-722,7.DOI:10.3969/j.issn.1000-2561.2017.04.020
锰离子对天然橡胶老化性能的影响
Effect of Manganese Ion on the Properties and Aging Mechanism of Natural Rubber
摘要
Abstract
The effect of manganese ion content on the properties and molecular chain structure of natural rubber (NR) before and after thermal oxidative aging,UV aging and ozone aging were studied using magnetic crosslink density analyzer,DSC analyzer and Fourier transform infrared analyzer to explore the mechanism of aging.The results showed that the physical mechanical properties of natural rubber containing different amounts of manganese ions were basically consistent with the aging before aging.By the three ways after aging colloid properties had different degrees of decline.When the manganese ion concentration was 0.000 30％,the tensile strength,300％ tensile stress and 700％ tensile stress decreased least.Crosslink density test showed that the total crosslinking density (XLD) and net chain molecular weight (Mc) had a good relationship,XLD with the increase of manganese ion mass fraction increased first and decreased in the aging process,showing that the natural rubber crosslinking reaction and breaking reaction in competition.The results of differential scanning calorimetry (DSC) showed that the glass transition temperature (Tg) of natural rubber increased first and then decreased with the increase of Mn ion mass fraction,which was consistent with the results of nuclear magnetic cross link density test.Infrared analysis (FTIR) found that the aging process of natural rubber in the process of crosslinking and fracture.关键词
天然橡胶/锰离子/性能/结构Key words
natural rubber/manganese ion/performance/structure分类
化学化工引用本文复制引用
袁天元,廖双泉,赵艳芳,何凡,廖小雪..锰离子对天然橡胶老化性能的影响[J].热带作物学报,2017,38(4):716-722,7.基金项目
公益性行业(农业)科研专项经费项目(No.20140366) （农业）
国家自然科学基金项目(No.51363006) （No.51363006）
海南省重大科技计划项目(No.ZDKJ2016020). （No.ZDKJ2016020）
