Abstract The melt strength and drawability of a low-density polyethylene (LDPE), a high-density polyethylene (HDPE) and HDPE/LDPE blends during extension flow were studied using a Rheotens test method under die extrusion temperature ranging from 160 to 200 °C and die extrusion rates varying from 9 to 36 mm/s. The results showed that the melt strength of the HDPE, the LDPE and the blends decreased with increasing die extrusion temperature while it increased with increasing die extrusion rate. The drawability of the HDPE, the LDPE and the blend melts could be improved through increasing die extrusion temperature and reducing die extrusion ratio. The dependence of the melt strength of the HDPE, the LDPE and the blend melts on the die extrusion temperature approximately obeyed the Arrhenius equation.

中文翻译：

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HDPE、LDPE 和 HDPE/LDPE 共混物的熔体强度和拉伸性

摘要 使用 Rheotens 测试方法在 160 至 200 °C 的模具挤出温度下研究了低密度聚乙烯 (LDPE)、高密度聚乙烯 (HDPE) 和 HDPE/LDPE 共混物在拉伸流动过程中的熔体强度和拉伸性。和模具挤出速率从 9 到 36 毫米/秒不等。结果表明，HDPE、LDPE和共混物的熔体强度随着模头挤出温度的升高而降低，而随着模头挤出速率的增加而增加。HDPE、LDPE和共混熔体的可拉伸性可以通过提高模头挤出温度和降低模头挤出比来提高。HDPE、LDPE 和共混物熔体的熔体强度对模具挤出温度的依赖性近似服从 Arrhenius 方程。