EPDM/PP共混型热塑性硫化胶的增容研究

研究了酚醛树脂接枝改性聚丙烯(PP-g-MP)和马来酸酐接枝改性茂金属乙烯-辛烯共聚物(EOC-g-MAH)对动态硫化EPDM/PP共混型热塑性硫化橡胶(TPV)的增容作用,探讨了增容剂对TPV的物理机械性能、形态结构和流变性能的影响。结果表明,PP-g-MP能够提高EPDM/PPTPV的100%定伸应力和拉伸强度,但扯断伸长率下降;适量的EOC-g-MAH能够提高EPDM/PPTPV的拉伸强度和扯断伸长率,但100%定伸应力下降。接枝率越高,TPV的拉伸强度和扯断伸长率也越高。通过相差显微镜分析表明,加入增容剂有助于橡胶粒子的更精细、更均匀地分散,EOC-g-MAH的增容作用更佳。加入EOC-g-MAH后TPV的切敏性更显著。

Study on compatibilization of EPDM/PP TPV

Both the methylolphenolic -grafted polypropylene(PP -g -MP )and maleic acid -graft-ed ethylene octane copolymer(EOC -g -MAH)were used to improve the compatibility of EPDM/PP thermoplastic vulcanizate(TPV),and their effect on the mechnacial properties,phase structure and rheo-logical property of TPV were studied.PP -g -MP increased modulus at 100%and tensil e strength of TPV but decreased elongation at brea k,while EOC -g -MAH increased tensile strength an d elongation at break of TPV but decreased modulus at100%,fur-thermore,the higher the graft ratio of EOC -g -MAH,the higher the tensile strength and elongationat break of TPV.By phase contrast mic roscope pho-tographs of TPV,the addition of comp atibilizing agent (preferably EOC -g -MAH)could help to produce the fine and uniform dispers e of vulcanizated rubber.As a result,EPDM/PP blends w ere well compatibilized by interactions between methylolphe-nolic -crosslinked EPDM and EOC -g -M AH.TPV showed better shear sensitivity.