剪切作用下马来酸酐接枝乙烯-辛烯共聚物和乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯共聚物对PA1010/PP共混物的增容作用比较

采用熔体共混的方法制备了两种增容剂增容的聚酰胺1010/聚丙烯(PA1010/PP)共混物,通过扫描电镜(SEM)、力学性能和差示扫描量热(DSC)测试,对动态保压注射成型(动态)和普通注射成型(静态)中增容剂POE-g-MAH(马来酸酐接枝乙烯-辛烯共聚物)和PTW(乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯共聚物)对PA1010/PP共混物的增容作用进行了比较研究.研究结果表明,普通注射成型中,PTW增容体系具有更小的分散相粒子,在DSC测试中出现两个结晶峰,即出现异相成核结晶和均相成核结晶,具有更好的拉伸和冲击性能,增容作用更佳.动态保压注射成型中施加剪切可以提高所有共混物的拉伸强度、拉伸模量和缺口冲击强度,PTW和POE-g-MAH两种增容剂增容体系冲击性能相近,但POE-g-MAH增容体系的分散相相区尺寸减小明显、分布均匀性显著增加,材料冲击强度增加幅度更大,表明剪切更有利于POE-g-MAH增容作用的进行.两种增容剂增容作用的不同源于它们化学组成的不同引起的材料形态差别.

COMPARATIVE STUDY ON COMPATIBILIZATION EFFECT OFMALEIC ANHYDRIDE-GRAFTED ETHYLENE-OCTENE COPOLYMER AND ETHYLENE-BUTYL ACRYLATE-GLYCIDYL METHACRYLATE TERPOLYMER ON PA1010/PP BLENDS OBTAINED VIA DYNAMIC PACKING INJECTION MOLDING

Various polyamide1010/polypropylene (PA1010/PP) blends were prepared by melt mixing using maleic anhydride-grafted ethylene-octene copolymer (POE-g-MAH) or ethylene-butyl acrylate-glycidyl methacrylate terpolymer (PTW) as compatibilizers.The compatibilizing effects of POE-g-MAH and PTW on PA1010/PP blends obtained via dynamic packing injection molding(DPIM) were investigated by means of scaning electron microscopy (SEM),mechanical testing and differential scaning calorimetry (DSC),respectively.It was found the static specimens compatibilized with PTW had smaller domain size in the same condition,two crystallization peaks of PP appeared in DSC cooling curves,the crystallization at the lower temperature should be assigned to homogeneous nucleation,and the other one was heterogeneous nucleation.The static specimens compatibilized with PTW had better tensile and impact properties than the ones compatibilized with POE\|g\|MAH,indicating a better compatibilization effect of PTW on PA1010/PP.The tensile strength,tensile modulus and notched impact strength of all blends were found to increase largely by means of shearing.The dynamic specimens compatibilized with POE-g-MAH and PTW had almost the same impact strength.But the dynamic molded specimens compatibilized with POE-g-MAH had a remakably decrease of domain size and more uniform dispersion.Thus their impact strength increased more than that of PTW,which indicated that shear stress was more beneficial to the interactions occuring between POE-g-MAH and PA1010/PP.The differences of compatibilization effect between POE-g-MAH and PTW lay in the differences of morphology of materials caused by their chemical compositions.