【摘要】 采用熔融共混方法制备聚丙烯（PP）、纳米二氧化硅（nano-SiO₂）、马来酸酐接枝PP（PP-g-MAH）、硅烷偶联剂（KH560）共混体系,利用旋转式流变仪、场发射扫描电子显微镜（SEM）研究了PP/nano-SiO₂共混体系动态流变行为和界面微观结构。结果表明:KH560和PP-g-MAH协同作用增强了nano-SiO₂粒子与基体PP的界面相容性,改善了nano-SiO₂粒子在基体PP中的分散性;在nano-SiO₂粒子含量相同的PP/nano-SiO₂共混体系中,动态储能模量（G′）和动态损耗模量（G″）均在高频时数值较大,随着频率降低,数值也逐渐降低;PP基体中填充nano-SiO₂粒子后,共混体系复数黏度（η*）下降;随着角频率（ω）增加,力学损耗因子（tanδ）逐渐高于PP,最后趋于接近;Han曲线在高频区基本呈线性关系,而在低频区,Han曲线明显偏离了线性关系,出现末端区效应;建立了PP/nano-SiO₂共混体系熔体界面相互作用物理模型。更多还原

【Abstract】 A blending system of polypropylene（PP）, nano-silica（nano-SiO₂）, maleic anhydride grafted PP（PP-g-MAH）, and silane coupling agent（KH560） was prepared by using the melt blending method, the dynamic rheological behavior and interface microstructure of the PP/nano-SiO₂ blend system were studied by the rotary rheometer and SEM.The results show that synergistic effect of the silane coupling agent（KH560）and the PP-g-MAH enhances the interfacial compatibility between the nano-SiO₂ particles and the matrix PP, and improves the dispersion of the nano-SiO₂ particles in the matrix PP. In the PP/nano-SiO₂blend system with the same nano-silica particle content, dynamic storage modulus（G ′） and dynamic loss modulus（G″） are both larger at high frequency, and the value gradually decreases with the decreasing of frequency.The complex viscosity（η*） of the system decreases after filling the PP matrix with nano-SiO₂ particles. As the angular frequency（ω） increases, the mechanical loss factor（tanδ） of the blending system gradually becomes higher than that of PP, and finally approaches.The Han curve is basically linear in the high frequency range, and in low frequency region, the Han curve deviates significantly from the linear relationship, and a terminal region effect appears. A physical model of the melt at the interface interaction of the PP/nano-SiO₂ blend system is established.更多还原