三元乙丙橡胶结合单体含量核磁共振氢谱分析法的改进

Improvement of ~1H-NMR quantitative analysis method for determination of combined monomer content in EPDM rubber

更加准确地测定三元乙丙橡胶(EPDM)中的结合单体含量,是为EPDM产品质量控制和新牌号产品研发提供可靠的参考指标。利用EPDM标准样品,采用核磁共振氢谱法(1 H-NMR),对前期文献中提出的一次性快速分析EPDM中乙烯(C2)、丙烯(C3)和乙叉降冰片烯(ENB)单体含量的方法进行了改进,重新设定了谱图的积分区域,并提出了另外一种简便的结合单体质量分数计算方法。结果表明,利用改进后的新方法获得的测定值比原方法更加接近标准样品标注的"真值",定量依据也更加可靠。

In the paper,in order to determine the combined monomer contents of ethylene-propylene-diene rubber （EPDM） more accurately, thus we provided more reliable reference index for the quality control as well as research and development of EPDM products. We improved the convenient 1H nuclear magnetic resonance （^1 H-NMR） quantitative analysis method on the monomer contents of ethylene （C2）,propylene （C3） and 5-ethylidene-2-norbornene （ENB）,which was proposed in the pre- vious paper of our team,by using standard EPDM samples.The integration range was reset and a new calculation formula was proposed. The experiment results showed that the determination values are more close to the ＇true values＇ by the new method compared with the previous method and the theory basis of the new method is more reliable.