摘要
采用具有快速收敛入口区的狭缝流变模具和 Labview 数据采集系统,对不同温度及不同注气量条件下的聚丙烯(PP)/CO_2体系的流变行为进行研究,探讨了超临界 CO_2/PP 体系黏度曲线的变化规律,并通过超声波探测系统,测量PP/CO_2体系的临界发泡压力。结果表明,不同工艺条件下 PP/CO_2体系的黏度曲线具有相似的斜率,且随注气量和体系温度的增大而线性降低;在体系温度175℃时,发泡临界压力随着体系温度的降低而增大。
By using a slot rheological die with a slit channel and Labview data collection system, rheological behavior of polypropylene/supercritical carbon dioxide mixture was studied at different temperatures and gas concentration. Critical foaming pressure of PP/CO2 system was also determined by utilizing a novel ultrasonic detecting system. It showed that the viscosity curves under different conditions have similar slope, and shift linearly down with increasing melt temperature and gas volume. When melt temperature was below 175 ℃, the critical foaming pressure increased with decreasing melt temperature.
出处
《中国塑料》
CAS
CSCD
北大核心
2008年第6期77-82,共6页
China Plastics
基金
北京科技新星计划资助2005B16
北京市服装材料研究开发与评价重点实验室开放基金资助
关键词
在线流变测量
缝隙模具
聚丙烯
二氧化碳
临界发泡压力
in-line rheology measurement
slit die
polypropylene
carbon dioxide
critical foaming pressure
