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采用小角激光光散射(SALLS)和动态流变方法研究了通过不同制备方法得到的等规聚丙烯/乙丙橡胶共混物(iPP/EPR)的相分离行为与黏弹行为.依据Cahn-Hilliard-Cook理论分析了熔融共混和溶液共混法制备的质量比为60/40和40/60的iPP/EPR共混物在恒温相分离早期的动力学,发现熔融共混iPP/EPR具有更大的表观扩散系数(Dapp).相分离中后期的实验结果表明,当相区尺寸增长程度相同时,熔融共混试样所用时间更短.表明熔融共混iPP/EPR试样具有更快的相分离速率.动态流变测试结果表明,与溶液共混相比,熔融共混试样具有更快的松弛速率.考虑到相分离过程实质是由高分子链的运动与扩散所控制,两种方法制备的iPP/EPR共混物相分离速率的差异应归于其分子链运动能力的不同.
Phase separation behavior and viscoelastic behavior of isotactic polypropylene / ethylene-propylene rubber blends (iPP / EPR) obtained by different preparation methods were investigated by SALLS and dynamic rheological methods. According to Cahn-Hilliard -Cook theoretically analyzed the kinetics of the early phase separation of iPP / EPR blends prepared by melt blending and solution blending at a mass ratio of 60/40 and 40/60, and found that the melt blending iPP / EPR has a larger (Dapp) .The experimental results in the middle and late stages of phase separation show that the melt blending samples take shorter time when the size of the phase grows to the same extent, which indicates that the melt blending iPP / EPR samples have faster Phase separation rate dynamic rheological test results show that, compared with solution blending, melt blending samples have a faster relaxation rate.Considering the phase separation process is essentially controlled by the movement and diffusion of the polymer chain, two methods The difference in phase separation rates between prepared iPP / EPR blends should be attributed to the different kinematic capacities of the molecular chains.