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首页> 外文期刊>Journal of Applied Polymer Science >Effect of nano-silica filler on the rheological and morphological properties of polypropylene/liquid-crystalline polymer blends
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Effect of nano-silica filler on the rheological and morphological properties of polypropylene/liquid-crystalline polymer blends

机译：纳米二氧化硅填料对聚丙烯/液晶聚合物共混物流变学和形态学性能的影响

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A fumed hydrophilic nano-silica-filled polypropylene (PP) composite was blended with a liquid-crystalline polymer (LCP; Rodrun LC5000). The preblended polymer blend was extruded through a capillary die; this was followed by a series of rheological and morphological characterizations. The viscosity of the PP matrix increased with the addition of the hydrophilic nano-silica. At shear rates between 50 and 200 s(-1), the composite displays marked shear-thinning characteristics. However, the incorporation of LC5000 in the PP composite eliminated the shear-thinning characteristic, which suggests that LC5000 destroyed the agglomerated nano-silica network in the PP matrix. Although the viscosity ratio of LCP/PP was reduced after the addition of nano-silica fillers, the LCP phases existed as droplets and ellipsoids. The nano-silicas were concentrated in the LC5000 phase, which hindered the formation of LCP fibers when processed at high shear deformation. We carried out surface modification of the hydrophilic nano-silica to investigate the effect of modified nano-silica (M-silica) on the morphology of the PP/LC5000 blend system. Ethanol was successfully grafted onto the nano-silica surface with a controlled grafting ratio. The viscosity was reduced for PP filled with ethanol-M-silica when compared to the system filled with untreated hydrophilic nano-silica. The LC5000 in the (PP/M-silica)/LC5000 blend existed mainly in the form of fibrils. At high shear rates (e.g., 3000 s(-1)), the LC5000 fibril network was formed at the skin region of the extrudates. The exclusion of nano-silica in the LC5000 phase and the increased viscosity of the matrix were responsible for the morphological changes of the LCP phase. (C) 2002 Wiley Periodicals, Inc. [References: 14]
机译：将热解的亲水纳米二氧化硅填充的聚丙烯（PP）复合材料与液晶聚合物（LCP; Rodrun LC5000）共混。将预共混的聚合物共混物通过毛细管模挤出;随后是一系列流变学和形态学表征。 PP基体的粘度随着亲水性纳米二氧化硅的添加而增加。在50到200 s（-1）之间的剪切速率下，复合材料显示出明显的剪切稀化特性。然而，LC5000在PP复合材料中的掺入消除了剪切稀化特性，这表明LC5000破坏了PP基体中的团聚纳米二氧化硅网络。尽管在添加纳米二氧化硅填料后，LCP / PP的粘度比有所降低，但LCP相却以液滴和椭圆体的形式存在。纳米二氧化硅在LC5000相中富集，这在高剪切变形条件下阻碍了LCP纤维的形成。我们对亲水性纳米二氧化硅进行了表面改性，以研究改性纳米二氧化硅（M-silica）对PP / LC5000共混体系形态的影响。将乙醇以受控的接枝率成功接枝到纳米二氧化硅表面。与填充有未处理的亲水性纳米二氧化硅的体系相比，填充有乙醇-M-二氧化硅的PP的粘度降低了。 （PP / M-二氧化硅）/ LC5000共混物中的LC5000主要以原纤维形式存在。在高剪切速率（例如3000 s（-1））下，LC5000原纤维网络在挤出物的表皮区域形成。 LC5000相中纳米二氧化硅的排除和基质粘度的增加是LCP相形态变化的原因。 （C）2002 Wiley Periodicals，Inc. [参考：14]

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