【摘要】 以乙烯 -1-辛烯共聚物 (EOC)对聚丙烯 (PP)进行增韧改性 ,通过小角光散射测取到不同配比的共混物的相关距离 αc、积分不变量Q ,进一步求得分散相粒子表面间距 τ和过渡层厚度d ,研究 τ与材料冲击性能之间的关系 ,发现存在一个临界值 τc与材料的脆韧转变点相对应。当 τ≤τc 时 ,材料是韧性的 ;当 τ>τc 时 ,材料呈脆性。在共混过程中 ,τ随共混时间增加逐渐减小 ,在共混的中后期趋于稳定 ;随 τ值的减小 ,材料冲击强度增加。过渡层厚度d随EOC含量的递增逐渐增大 ,对应材料的冲击强度增加。更多还原

【Abstract】 Small angle laser scattering (SALS) measurements wer e carried out on a blend of polypropylene with ethylene-1-octene (POE) copolymer , and the correlation distance α c, the integral invariant Q were obta ined. Using the correlation distance α c1 ,α c2 , and the volu me fraction φ 2, the surface-to-surface interparticle distance τ a nd the trans ition layer thickness d were calculated. A critical value τ c was foun d related to the brittle-ductile transition, below and above which corresponded to tough and brittle behavior, respectively. The τ value decreased with in creasing blending time and reached a equilibrium value. The value increased with increasing content of POE, which could be employed as a measure of the increase of notch impact strength.更多还原