HDPE熔体连续挤出自增强的研究 (Ⅱ) 自增强试样横截面上性能的不均匀性

STUDY ON SELF REINFORCED HDPE FROM CONTINUOUS MELT EXTRUSION Ⅱ. PROPERTIES INHOMOGENEITY ACROSS THE CROSS SECTION OF SELF REINFORCED SAMPLE

ＤＳＣ分析表明，熔体连续挤出自增强ＨＤＰＥ片材表层的自增强程度要比芯部的高。借助楔形收敛流道内熔体流场（延伸应变速率）与温度场的分布规律，可知，熔体温度是导致自增强试样横截面上自增强程度不均匀的主要原因。

It has been shown by DSC analyses that the outer layer of the self reinforced HDPE sheet prepared by continuous melt extrusion has a higher self reinforcement degree than its inner core. With the aid of the distribution regularity of flow field(extensional strain rate) and temperature field of a polymer melt flowing through a wedge shaped convergent channel, it has indicate that the melt temperature is the main reason leading to the properties inhomogeneity across the cross section of the self reinforced sample.