聚丙烯及其碳酸钙填充体系在外力场下的流变特性

以不同配比的CaCO3/PP共混物为研究对象,利用实验室自主研制的多功能全电动聚合物流变特性测试仪,研究了数据提取与处理方法、不同CaCO3填充量及加工工艺参数(剪切速率、振幅和振动频率)对体系流变特性的影响,以及数据提取与处理方法和振动参数对体系流变特性影响的差异性。试验结果表明:不同的数据提取与处理方法会影响聚合物的表观剪切黏度测试结果,在稳态条件下有显著差异,在振动力场作用下这种效应明显减弱;在低剪切速率区,共混体系的表观剪切黏度随着CaCO3填充量的增加而升高,在高剪切速率区,CaCO3填充量的影响程度大大减弱;共混体系的表观剪切黏度随着振动振幅的增加迅速下降,而随着振动频率的增加表现出类正弦周期性变化的特征。

Exploration of Rheological Properties of Calcium Carbonate Particle Filled PP Blends Under Influence of External Force Field

With the self-made multifunctional all-electronic rheometer for polymer composites, the effects of data collecting and processing method, calcium carbonate filling content and processing parameters (shear rate, vibration amplitude and vibration frequency) on rheological properties of calcium carbonate filled propylene blends were investigated. And the different effects of data collecting and processing methods as well as vibration parameters on rheological properties of the blends were also discussed in details. The experimental results proves that: different methods to collect and process data will result in distinct apparent viscosity deviation at steady shearing state, and is reduced when being subject to vibration force field. Within lower shear rate zone, the apparent viscosity of the blends goes up dramatically with increasing mass ratio of filled calcium carbonate. However, the effect weakens within relatively higher shear rate zone. Besides, the apparent viscosity declines rapidly with vibration amplitude, and exhibits a sinusoidal trend as vibration frequency increases.