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以毛细管流变仪研究了粉煤灰(FA)改性聚丙烯/三元乙丙橡胶接枝马来酸酐/Al(OH)_3/FA[PP/EPDM-gMAH/Al(OH)_3/FA]阻燃复合体系的流变行为,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,测定了不同配比的复合材料熔体的非牛顿指数(n)和挤出膨胀比。结果表明:PP/EPDM-g-MAH/Al(OH)_3/FA熔体为假塑性流体,表观黏度随着剪切速率增加而降低。当FA的含量在0%~25%范围内时,共混物的n<1,且在5%和20%处有2个极大值点,表观黏度呈先增后减再增的趋势;FA可降低共混熔体的粘流活化能,但适量FA仍可保证温敏性不会降低太大,复合材料的挤出胀大现象随FA增加有所降低。
The effects of fly ash (FA) modified polypropylene / EPDM grafted maleic anhydride / Al (OH) 3 / FA [PP / EPDM-gMAH / Al ] Rheological behavior of the flame retardant composite system, the composition of the composite material, shear stress and shear rate and temperature on the melt rheological behavior, melt viscosity, the determination of the proportion of the composite melt Non-Newtonian index (n) and extrusion expansion ratio. The results show that the PP / EPDM-g-MAH / Al (OH) 3 / FA melt is pseudoplastic fluid, and the apparent viscosity decreases with the increase of shear rate. When the content of FA is in the range of 0% ~ 25%, the blends have n <1, and there are two maximum points at 5% and 20%, and the apparent viscosity increases first and then decreases again ; FA can reduce the viscous flow activation energy of the blended melt, but the proper amount of FA can still ensure that the thermal sensitivity does not decrease too much, and the extrusion expansion of the composite material decreases with the increase of FA.