不同含量PP/Nano-SiO_(2)复合材料流变行为与发泡行为的关系研究

Study on rheological behavior and foaming behavior of PP/Nano-SiO_(2)composites with different contents of Nano-SiO_(2)

通过旋转流变仪、扫描电子显微镜对PP/Nano-SiO_(2)的流变性能和泡孔形貌进行测试和表征。结果表明:无论低频区还是高频区,加入Nano-SiO_(2)可使复合体系的储能模量、损耗模量、复数黏度下降,而损耗角的正切值、损耗角在低频区低于纯PP,高频区高于纯PP;结合孔隙率、泡孔密度、平均泡孔直径以及泡孔形态,发现当Nano-SiO_(2)含量为3 wt%时,泡孔数目较多,泡孔尺寸较小,泡孔形态较为规则,该状态下对应的流变性能所体现出的发泡行为较好。

The rheological properties and cell morphology of PP/Nano-SiO_(2)were tested and characterized by rotational rheometer and scanning electron microscope.The results show that the storage modulus,loss modulus and complex viscosity of the PP/Nano-SiO_(2)foams decrease with the addition of Nano-SiO_(2)in both low and high frequency regions,while the loss tangent and loss angle are lower than those of pure PP in low frequency region and higher than those of pure PP in high frequency region;Combined with porosity,cell density,average cell diameter and cell morphology,when the Nano-SiO_(2)content is 3 wt%,the number of cells is larger,the cell size is smaller,and the cell morphology is more regular,indicating that the suitable rheological properties are needed to obtain good cell quality.