增容作用和动态固化对聚丙烯/环氧树脂共混物形态结构的影响

研究了增容作用和动态固化对聚丙烯(PP)/环氧树脂(EP)共混物形态结构的影响。实验结果表明,PP/EP共混物是不相容共混体系,当环氧树脂含量小于50%时,共混物中环氧树脂以分散相存在,PP为连续相。反之,则共混物的相态发生相反转,即环氧树脂为连续相,PP为分散相。加入马来酸酐接枝聚丙烯(M AH-g-PP)促进环氧树脂与PP的相容性,使得分散相的颗粒明显变小。与PP/EP和PP/M AH-g-PP/EP共混物不同,当环氧树脂含量大于50%时,动态固化PP/EP和PP/M AH-g-PP/EP共混物仍是环氧树脂分散相和PP连续相结构,未出现相反转。对于相同含量环氧树脂的共混物,动态固化PP/M AH-g-PP/EP共混物中环氧树脂分散相尺寸明显小于动态固化PP/EP共混物中环氧树脂分散相尺寸。

EFFECTS OF COMPATIBILIZATION AND DYNAMICAL CURE ON THE MORPHOLOGY OF POLYPROPYLENE/EPOXY BLENDS

The effects of compatibilization and dynamical cure on the morphology of polypropylene(PP)/epoxy(EP) blends were studied.The results show that PP and EP are immisible in the blends,when the content of EP is low 50%,EP is acted as dispersed phase in the PP continuous phase.Otherwise,the morphology of the PP/EP blends is transformed that the PP is acted as dispersed phase in the EP continuous phase.The addition of maleic anhydride-grafted polypropylene(MAH-g-PP) could improve the compatibility between PP and EP,and decrease the average diameter of the dispersed phase in the PP/EP blends.When the content of the EP is over 50%,the morphology of dynamically cured PP/EP and PP/MAH-g-PP/EP blends is still that the EP is dispersed as particles in the PP continuous phase,which is different from the morphology of the PP/EP and PP/MAH-g-PP/EP blends.The average diameter of the EP particles in the dynamically cured PP/MAH-g-PP/EP blends containing the same content of EP is smaller than that of in dynamically cured PP/EP blends.