马来酸酐接枝液体异戊橡胶接枝率的测试方法

Test Method of Grafting Ratio of Maleic Anhydride Grafted Liquid Isoprene Rubber

在锂系液体橡胶（LIR）聚合反应后期加入马来酸酐（MAH）进行接枝反应,制备了马来酸酐接枝液体异戊橡胶（LIR-g-MAH）。采用化学滴定法对比研究了LIR-g-MAH接枝率的测试方法。结果表明,直接滴定法准确度高、重复性好,且当样品用量为1.0~2.0g,水解试剂为乙醇,滴定碱标准溶液浓度为0.08~0.12mol/L时,测试条件最优。

Maleic anhydride grafted liquid isoprene rubber（LIR-g-MAH）is synthesized by maleic anhydride（MAH）and solution of liquid isoprene rubber（LIR）after polymerization reaction of LIR with lithium catalyst.The test method of grafting ratio of LIR-g-MAH was studied with chemical titration method.Results showed that the optimal determination conditions for grafting ratio of LIR-g-MAH are as follows：the direct titration method has higher accuracy and better repeatability,sample dosage is 1.0~2.0g,hydrolysis reagent is ethanol,the concentration of standard KOH-ethanol solution is 0.08~0.12mol/L.