茂金屬聚乙烯複合材料流動性質的探討

Flow Behavior of Metallocene Polyethylene/Clay Nanocoposites

劉俊良(Jung-Liang Liu) ； 李宗翰(Zong-Han Li)

《國立宜蘭大學工程學刊》 8期 (2012/12) Pp. 128-151

https://doi.org/10.6176/BCE.2012.08.19

摘要

本研究針對奈米顆粒含量、表面改質後的奈米顆粒及相容劑存在與否對聚合物奈米複合材料在熔融狀態的流動狀態作系統的探討。選用測試樣品為茂金屬聚乙烯、奈米黏土及聚乙烯改質相容劑。測試方法含兩類：動態機械測試及穩定狀態剪切流動。利用動態機械測試所得之數據製成的主曲線顯示，儲存模數及損失模數兩主曲線均出現交錯現象。結果不含相容劑系統的樣品無法辨視其差異，但加入相容劑使得填充量影響出現極為顯著的變化。由mCC Plot的曲線，則可觀察出對表面處理後的奈米顆對複合材料的影響。在穩定剪切流動的測試中，樣品因相容劑的存在，導致樣品出現明擬塑性流動。利用Cox-Merz定律發現，未經改質奈米顆粒樣品的均出現完全的非線性黏彈性質；而其餘兩個系列的樣品在較高的奈米含量材會出現該性質。

關鍵字

奈米複合材料 ； 動態機械性質 ； 剪切黏度

並列摘要

This paper presents the effect of surface treatment on molten flow behavior of polyethylene nanocomposites. Enhancement effect of addition of coupling agent to the nanocomposites is also discussed. Two types of measurements, namely DMA and steady shear shear flow, were performed. All samples showed crossover in the master curves of storage and loss moduli. However, only coupling system shows effect of nanoclay content on the dynamic properties of nanocomposites. Effect of surface treatment is identified from modified Cole-Cole plot. In steady state shear flow, addition of coupling agent to the nanocomposites results in significant pseudo-plastic flow behavior. By making use of Cox-Merz rule, one can observe nonlinear viscoelastic behavior for the nanocomposites containing the clay without surface treatment. The nanocomposites having clay with surface treatment behave nonlinear elasticity, in the higher shear rate region.

並列關鍵字

Nanocomposites ； Dynamic mechanical properties ； Shear flow