Evolution of morphological and rheological properties along the extruder length for blends of a commercial liquid crystalline polymer and polypropylene
Evolution of morphological and rheological properties along the extruder length for blends of a commercial liquid crystalline polymer and polypropylene
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DOI：
10.1016/j.polymer.2003.12.080
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发表时间：
2004-03-29
期刊：
影响因子：
4.6
通讯作者：
Maia, JM
中科院分区：
文献类型：
--
作者：
Filipe, S;Cidade, MT;Maia, JM
本工作的主要目的是研究聚丙烯和商业液晶聚合物Rodrun LC 3000的共混物在挤出过程中的形态和流变演变。该研究是在220和240 ℃下加工的含有10、20和40重量% LCP的共混物。为此，使用特殊的收集装置，其允许在沿着挤出机长度的不同位置处移除样品。形态学研究的结果表明，LCP结构的平均直径随着它们沿着挤出机轴的行进而减小。的流变性能也进行了研究非原位在线性和非线性政权。从在振荡剪切中获得的结果中观察到，弹性模量和复数粘度从挤出过程的开始到结束降低，对于最终挤出物达到最小值。FT流变学用于研究非线性粘弹性行为，并且结果还显示在工艺的各个阶段收集的样品之间的显著差异，比率I（3 ω（1））/I（ω（1））沿挤出机沿着减小。(C)2004爱思唯尔有限公司保留所有权利。
The main aim of this work is to study the morphological and rheological evolution during extrusion of blends of polypropylene and a commercial liquid crystalline polymer, Rodrun LC3000. This study was performed for blends with 10, 20 and 40 wt% LCP, processed at 220 and 240degreesC. For this purpose, a special collecting device was used that allows the removal of samples at different locations along the extruder length. The results of the morphological study revealed that the mean diameter of the LCP structures decrease as they proceed along the extruder axis. The rheological properties were also studied ex situ both in the linear and in the non-linear regime. From the results obtained in oscillatory shear it was observed that the elastic modulus and the complex viscosity decreases from the beginning to the end of the extrusion process, reaching a minimum for the final extrudate. FT rheology was used to study the non-linear viscoelastic behavior and the results also show marked difference between samples collected at various stages of the process, the ratio I(3omega(1))/I(omega(1)) decreasing along the extruder. (C) 2004 Elsevier Ltd. All rights reserved.