An in-process ultrasonic approach to investigating the relaxation of orientation and disorientation of polymer melts
An in-process ultrasonic approach to investigating the relaxation of orientation and disorientation of polymer melts
复制标题
DOI：
10.1002/pen.21023
复制
发表时间：
2008-05
影响因子：
3.2
通讯作者：
Jiang Li;Zhigang Sun;J. Tatibouët;C. Jen
中科院分区：
文献类型：
--
作者：
Jiang Li;Zhigang Sun;J. Tatibouët;C. Jen
用超声波研究了低密度聚乙烯熔体和不同熔体指数的聚丙烯熔体在受限通道内剪切流动时的取向和弛豫行为。利用毛细管流变仪强迫聚合物熔体通过装有压力、温度和超声传感器的狭缝模具，测量了超声速度穿过熔体的变化。实验结果表明，由于作用机制不同，取向弛豫和失向弛豫过程对剪切速率、温度和熔体指数的依赖程度不同。变异较大。ENG。科学。, 2008年。发表于2008年塑料工程师协会
The orientation and relaxation behaviors of a low-density polyethylene melt and polypropylene melts with different melt indices undergoing a shear flow in a restricted channel were investigated by using ultrasound. A capillary rheometer was used to force the polymer melt through a slit die equipped with pressure, temperature, and ultrasound sensors, and the variation of ultrasound velocity traversing the melt was measured. Experimental results revealed that due to different mechanisms involved, the relaxations of orientation and disorientation processes show different dependences of ultrasound velocity on shear rate, temperature, and melt index. POLYM. ENG. SCI., 2008. Published 2008 Society of Plastics Engineers