摘要
利用RH-2000型双管挤出毛细管流变仪对mLLDPE-1018FA进行流变性能测试,得到一系列流变曲线,发现mLLDPE具有比较特殊的流变性能,如高的熔体表观黏度、高剪切速率下的黏度反转等。计算了这种聚乙烯树脂的粘流活化能和非牛顿指数,给出了二者与剪切速率的定量方程,考察了温度对其流变性能的影响,为这种树脂的加工提供了基础数据。
The reological properties of metallocene linear low density polyethylene （m-LLDPE） were measured by twin-bore extrusion capillary rheometer at different temperatures and shear rates. The influences of shear rates and temperatures on apparent melt viscosity （ηa）, non-Newtonian exponent （n）, and flow activation energy （Eη） were investigated and discussed. Increasing shear rate resulted in the decrease of ηa, n, and Eη of mLLDPE, showing a typical shear-thinning property of the pseudoplastic fluid. And the shear-thinning property strongly depended on the melt temperature. Most importantly, a linear relation between melt shear rate and n （or Eη） of m-LLDPE can be given by the equation： n = 0.946-0.3241gγ（t=160℃） or lgEη= 4.433-0.09851gγ, respectively.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第7期129-131,135,共4页
Polymer Materials Science & Engineering
基金
留学回国人员科研启动基金资助
