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首页> 外文期刊>Journal of Applied Polymer Science >Melt rheology and morphology of LLDPE/EVA blends: Effect of blend ratio, compatibilization, and dynamic crosslinking
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Melt rheology and morphology of LLDPE/EVA blends: Effect of blend ratio, compatibilization, and dynamic crosslinking

机译：LLDPE / EVA共混物的熔体流变学和形态：共混比，相容性和动态交联的影响

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摘要

The melt rheological properties of linear low-density polyethylene (LLDPE)/ethylene vinyl acetate (EVA) blends were investigated with special reference to the effect of blend ratio, temperature, shear rate, compatibilization, and dynamic vulcanization. The melt viscosity of the blends determined with a capillary rheometer is found to decrease with an increase of shear rate, which is an indication of pseudoplastic behavior. The viscosity of the blend was found to be a nonadditive function of the viscosities of the component polymers. A negative deviation was observed because of the interlayer slip between the polar EVA and the nonpolar LLDPE phases. The melt viscosity of these blends decreases with the increased concentration of EVA. The morphology of the extrudate of the blends at different shear rates and blend ratios was studied and the size and distribution of the domains were examined by scanning electron microscopy. The morphology was found to depend on shear rate and blend ratio. Compatibilization. of the blends with phenolic- and maleic-modified LLDPE increased the melt viscosity at lower wt % of compatibilizer and then leveled off. Dynamic vulcanization is found to increase the melt viscosity at a lower concentration of DCP. The effect of temperature on melt viscosity of the blends was also studied. Finally, attempts were made to correlate the experimental data on melt viscosity and cocontinuity region with different theoretical models. (C) 2002 Wiley Periodicals, Inc. [References: 52]
机译：研究了线性低密度聚乙烯（LLDPE）/乙烯乙酸乙烯酯（EVA）混合物的熔体流变性能，并特别考虑了混合物比例，温度，剪切速率，相容性和动态硫化的影响。发现用毛细管流变仪测定的共混物的熔体粘度随剪切速率的增加而降低，这表明假塑性行为。发现共混物的粘度是组分聚合物的粘度的非累加函数。由于极性EVA和非极性LLDPE相之间存在层间滑动，因此观察到负偏差。这些共混物的熔体粘度随着EVA浓度的增加而降低。研究了在不同剪切速率和混合比下共混物挤出物的形态，并通过扫描电子显微镜检查了畴的尺寸和分布。发现形态取决于剪切速率和混合比。相容性。与酚和马来酸改性的LLDPE的共混物的混合物在较低的增容剂的wt％下增加了熔体粘度，然后变平。发现动态硫化可以在较低的DCP浓度下增加熔体粘度。还研究了温度对共混物熔体粘度的影响。最后，尝试将熔体粘度和共连续性区域的实验数据与不同的理论模型进行关联。 （C）2002 Wiley Periodicals，Inc. [参考：52]

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