Abstract

The results of the study of the rheological characteristics of low- and high-density polyethylene blend in the ratio of 50 : 50 and its composites filled with aluminum hydroxide are presented. The influence of the concentration of aluminum hydroxide, temperature, and shear stress on the regularity of changes in the effective viscosity and shear rate has been established. Rheograms of low- and high-density polyethylene blend in the ratio of 50 : 50 and composites based on it are presented. The dependence of viscosity on temperature in Arrhenius coordinates is determined, according to which the “apparent” activation energy of viscous flow for the initial low- and high-density polyethylene blend and its composites filled with aluminum hydroxide varies in the range of 6–19 and 11–31 kJ/mol, respectively. A universal temperature-invariant characteristic of the viscosity properties of low-and high- density polyethylene blend in the ratio of 50 : 50 and its composites filled with aluminum hydroxide, which makes it possible to predict the change in the melt viscosity of composites in a wide range of shear rates and stresses, is drawn. It is shown that, with an increase in the concentration of aluminum hydroxide in the polymer mixture to 5 wt %, the value of the shear rate remains almost unchanged relative to the initial low- and high-density polyethylene blend (50/50). Rheological studies of the melt of polymer materials have been carried out in accordance with the standard ASTM D1238 on a CEAST MF50 capillary rheometer (INSTRON, Italy) in the temperature range of 190–250°C and in the load range of 3.8–21.6 kg.

中文翻译：

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氢氧化铝和低密度高密度聚乙烯共混物的流变性能

摘要

提出了以50:50的比例混合低密度和高密度聚乙烯共混物及其填充氢氧化铝的复合材料的流变特性的研究结果。已经确定了氢氧化铝的浓度，温度和剪切应力对有效粘度和剪切速率变化规律的影响。给出了低密度聚乙烯混合物和高密度聚乙烯混合物的比例为50:50的流变图以及基于它的复合材料。确定了粘度对温度的依赖关系（在Arrhenius坐标中），根据该粘度，初始低密度和高密度聚乙烯共混物及其填充有氢氧化铝的复合材料的粘性流的“表观”活化能在6-19范围内变化和11–31 kJ / mol。低密度聚乙烯和高密度聚乙烯共混物的比率为50:50的通用特性，其粘度特性及其填充有氢氧化铝的复合材料具有普遍的温度不变性，这使得预测复合材料熔体粘度的变化成为可能。绘制了范围广泛的剪切速率和应力。结果表明，随着聚合物混合物中氢氧化铝的浓度增加至5 wt％，相对于初始的低密度和高密度聚乙烯共混物（50/50），剪切速率的值几乎保持不变。聚合物材料熔体的流变学研究是根据标准ASTM D1238在CEAST MF50毛细管流变仪（意大利INSTRON）上进行的，温度范围为190–250°C，负载范围为3.8–21.6 kg 。