聚乙烯熔融纺丝测量的拉伸主曲线分析

摘要

Based on the results of low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) melts at various temperatures, mastercurves of melt spinning technique were plotted. Scaling factor b shows the combination effects on the unwrapping and orientation of molecular chains. A linear relationship between b and temperature is found. By using the values of b and reference curves, extension viscosity curves of setting temperature are calculated, the results show good agreement with the experimental values. Mastercurve analysis can expand the measurement range of melt spinning technique.%根据各种温度条件下低密度聚乙烯(LDPE)和线性低密度聚乙烯(LLDPE)熔体的熔融纺丝测量结果,绘制了拉伸主曲线;比例系数b反映了拉伸过程中的分子链解缠和取向对于熔体拉伸流变性能的综合作用,与温度T呈线性关系;利用b值和参考曲线,对设定温度条件下的拉伸黏度曲线进行了估箅,与实测值吻合良好.主曲线分析扩展了熔融纺丝法的测量范围.