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采用熔融共混制备了LLDPE/乙炔黑/煤粉复合材料,并通过毛细管流变仪对复合材料的流变性能进行了研究。详细讨论了复合材料的组成、剪切应力和剪切速率及温度对熔体流变行为、熔体黏度的影响。结果表明,LLDPE/乙炔黑/煤粉体系呈假塑性流体,表观黏度随着剪切速率增加而降低。当填料乙炔黑/煤粉含量在0%~40%范围内时,随着含量的增加,复合材料的表观黏度先增大后减小。填料乙炔黑/煤粉可以有效地增加粘流活化能,当含量为30%时,体系的表观黏度最大。
The LLDPE / acetylene black / pulverized coal composites were prepared by melt blending, and the rheological properties of the composites were investigated by capillary rheometer. The effect of composition, shear stress, shear rate and temperature on melt rheological behavior and melt viscosity was discussed in detail. The results show that the LLDPE / acetylene black / pulverized coal system is pseudoplastic fluid, apparent viscosity decreases with increasing shear rate. When the content of acetylene black / coal powder is in the range of 0% ~ 40%, the apparent viscosity of the composite first increases and then decreases with the increase of the content. The acetylene black / pulverized coal can effectively increase the activation energy of viscous flow. When the content is 30%, the apparent viscosity of the system is the largest.