PBano-SiO2复合材料的流变性能

摘要

采用熔融共混法制备了聚丁烯(PB)ano-SiO2复合材料,并用毛细管流变仪研究了PB及其复合材料在较宽剪切速率(1×102～6×103s-1)的流变行为.讨论了nano-SiO2含量、剪切应力、剪切速率及温度对熔体流变性、非牛顿指数和黏流活化能的影响.结果表明:PB及其复合材料的非牛顿指数均小于1,但PBano-SiO2的非牛顿指数大于PB的；随nano-SiO2含量增加,PBano-SiO2复合材料非牛顿指数上升；PBano-SiO2复合材料的熔融流动性随nano-SiO2用量的增加而下降；相同剪切速率时,PBano-SiO2的黏流活化能大于PB的.%The rheological behavior of PBano-SiO2 composites prepared by melt blending was studied in a wide shear rate (1 × 102 ~6 × 103s-1) using capillary rheome-ter. The effect of nano-SiO2 content, shear stress, shear rate and temperature on the meltrheology, non-Newtonian index and viscous flow activation energy was discussed. The results show that non-Newtonian index of PB and PB/SiO2 composites are less than 1, but non-Newtonian index of PBano-SiO2 is higher than that of PB. With the increase of nano-SiO2 content, non-Newtonian index of the composites increases. The melt flow behavior of PBano-SiO2 composites reduces with the increase of the content of nano-SiO2. At the same rate, viscous flow activation energy of PBano-SiO2 is greater than that of PB.