Effects of length distribution on the steady shear viscosity of semiconcentrated polymer-fiber suspensions
Effects of length distribution on the steady shear viscosity of semiconcentrated polymer-fiber suspensions
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长度分布对半浓缩聚合物纤维悬浮液稳态剪切粘度的影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Azaiez
中科院分区：
文献类型：
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作者：
A. Huq;J. Azaiez
测定聚环氧乙烷聚合物溶液中玻璃纤维的稳态剪切粘度。实验针对显示出广泛的长径比分布的研磨纤维以及具有均匀且明确的长径比的纤维样品进行。特别地，检查了通过混合均匀长度的纤维获得的单峰、双峰和三峰样品的结果。这些结果使我们能够分析长径比分布对粘度的影响，并确定迄今为止用于表征磨碎纤维长径比的不同传统平均技术的有效性。人们发现，所有这些传统的平均方法都不能很好地表示纤维长度的影响，并且广泛使用的数平均技术未能考虑到长纤维与短纤维的重要贡献。提出了一种新的基于模型的平均方法，并讨论了其与其他传统平均技术的性能比较。聚合物。 ENG。 SCI., 45:1357–1368, 2005。© 2005 塑料工程师协会
The steady state shear viscosity of glass fibers in a polyethylene oxide polymer solution was determined. The experiments were conducted for milled fibers that show a wide distribution of aspect ratios as well as for fiber samples that have a uniform and well-defined aspect ratio. In particular, results for one-modal, bi-modal, and tri-modal samples obtained by mixing fibers of uniform lengths were examined. These results allowed us to analyze the effect of the aspect ratio distribution on the viscosity and to determine the validity of different conventional averaging techniques that have been used so far to characterize the aspect ratio of milled fibers. It was found that all these conventional averaging methods do not give a good representation of the effect of the fibers length and that the widely used number-averaging technique fails to account for the important contribution of the long fibers vs. the short ones. A new model-based averaging method is proposed and its performance compared to that of other conventional averaging techniques is discussed. POLYM. ENG. SCI., 45:1357–1368, 2005. © 2005 Society of Plastics Engineers