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本文以聚丙烯 尼龙1010(PP PA1010)共混体系为模型研究了高分子共混物的微观相结构对宏观力学性能的影响,并通过微观力学模型来预测共混物的拉伸强度。通过光散射试验和扫描电镜结果讨论了两相平均弦长比(L1 L2)以及分散相的质心相关距(D)与拉伸性能的关系。结果表明,当分散相一定时,拉伸强度随两相相对尺寸的增大和分散相颗粒相关性的减弱而减小。理论计算的分散相最小体积分数与相形貌观察的结果非常接近,添加增容剂的体系,由于改善了界面粘合,使理论预测值与试验结果很好的吻合。
In this paper, macromolecular mechanical properties of macromolecular blends were investigated by using the blend system of polypropylene-nylon 1010 (PP PA1010) as a model. The tensile strength of blends was predicted by micromechanics model. The relationship between the average chord length (L1 L2) of the two phases and the correlation distance (D) between the center of mass of dispersed phase and the tensile properties was discussed by light scattering test and scanning electron microscopy. The results show that when the dispersed phase is constant, the tensile strength decreases with the increase of the relative size of the two phases and the decrease of the correlation of dispersed phase particles. The calculated minimum volume fraction of dispersed phase is very close to the observation of phase morphology. The addition of compatibilizer system, due to the improved interfacial adhesion, makes the theoretical predictions agree well with the experimental results.