CR/VAC/MMA/AA四元接枝共聚物合成及接枝率的研究

Study on synthesis and the grafting rate of tetrabasic graft copolymer of CR/VAC/MMA/AA

以醋酸乙烯酯(VAC)、甲基丙烯酸甲酯(MMA)、丙烯酸(AA)为接枝单体,以过氧化二苯甲酰(BPO)为引发剂,在氯丁胶(CR)上进行接枝共聚,制备出CR/VAC/MMA/AA四元接枝共聚物。探讨了提取剂和提取时间对四元接枝共聚物的接枝率测定的影响,并讨论了MMA/VAC配比、AA用量对接枝率和聚合转化率的影响。用红外光谱(IR)和DSC对接枝共聚物进行了表征。结果表明,选用丙酮作提取剂,提取时间为48h,接枝率数据较理想;试验中BPO质量为CR的1.2%-1.5%,CR/VAC/MMA/AA的质量配比为100/45/15/10时,其接枝率和聚合转化率最佳。

The tetrabasic graft copolymer was prepared on CR initiated by benzoyl peroxide (BPO),with VAC、MMA and AA as graft monomer by tetrabasic graft copolymerization.The graft copolymer was characterized by IR and DSC .The influences of extraction solvent and extraction time on the measurement of grafting rate were discussed ,and the effects of MMA /VAC ratio and amount of AA on grafting rate and polymerization covertion were also discussed. It was showed that better grafting rate were obtained with acetone as extraction solvent and 48h of extraction time.The grafting rate and polymerization coversion were optimum when the contents of BPO were 1.2-1.5% of CR and the mass ratio of CR/VAC/MMA/AA was 100/45/15/10.