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在传统转矩流变仪上叠加机械振动制成了振动共混流变仪。实验证明 ,振动共混降低了 70 /30聚碳酸酯 /聚丙烯共混物的粘度和储存模量 ,随着制备时的振动振幅和频率的提高 ,这种效果更加突出。但过大振幅振动中 ,低剪切与高剪切间的频繁更换 ,特别是明显的低剪切下相翻转较慢 ,导致形成了部分不稳定“双连续”相态 ,这时共混物粘度和模量反而比小振幅振动下制备的共混物的高。一个描述该体系表面张力 /液滴半径之比与剪切速率关系的经验表达式较好地分析了流变参数与微观相形态之间的关系 ,说明了振动促使分散相粒子的破碎和两相的分散 ,确实影响共混物的相形态。
In the traditional torque rheometer superposition of mechanical vibration made of vibration mixing rheometer. Experiments show that the vibrational blending reduces the viscosity and storage modulus of the 70/30 polycarbonate / polypropylene blend, and this effect becomes more pronounced as the vibration amplitude and frequency increase during preparation. However, in the case of too large amplitude vibration, the frequent exchange between low shear and high shear, especially the slow phase reversal under the obvious low shear, leads to the formation of partially unstable “bicontinuous” phase, when the blend Instead, the viscosity and modulus are higher than the blends prepared with small amplitude vibrations. An empirical expression describing the relationship between the surface tension / droplet radius ratio and the shear rate of the system provides a good analysis of the relationship between the rheological parameters and the morphology of the microscopic phase, demonstrating that the vibration promotes the fragmentation of the dispersed phase and two phases The dispersion does affect the phase morphology of the blend.