Effects of emulsion parameters on relaxation behaviors for immiscible polymer blends
Effects of emulsion parameters on relaxation behaviors for immiscible polymer blends
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DOI：
10.1002/app.39690
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发表时间：
2014-01
影响因子：
3
通讯作者：
Lin-Qiong Xu;Hanxiong Huang;Zhao Chen;Xiong-Jun Wu
中科院分区：
文献类型：
--
作者：
Lin-Qiong Xu;Hanxiong Huang;Zhao Chen;Xiong-Jun Wu
采用麦克斯韦和Palierne模型研究了不相容共混体系的储能模量和复粘度虚部曲线上的弛豫行为。结果表明，在复数粘度虚部图上的高频和低频区域中的峰分别是由于共混物和变形的分散液滴的松弛。基于这两个模型，研究了6个乳化参数（界面张力、弛豫时间、两组分粘度和分散相体积分数）对复粘度虚部和Cole-Cole曲线形状特征的影响。结果表明，两组分的粘度和分散相体积分数对Cole-Cole图上两圆弧半径起着关键作用。此外，这两个圆弧很好地分离的情况下，较低的界面张力和分散相粘度，较短的基质松弛时间，和较高的基质粘度和分散相体积分数。变形分散液滴的总松弛时间随两组分粘度的增大而增大，特别是随界面张力的减小而增大。制备了三种聚合物共混物，并对其进行了动态频率扫描测试，结果表明了相应预测结果的有效性。© 2013威利期刊公司. J.应用聚合物Sci. 2014，131，39690。
The relaxation behaviors of the binary immiscible blends reflected on the plots of the storage modulus and the imaginary part of complex viscosity were investigated using the Maxwell and the Palierne models. It was revealed that the peaks in the high- and low-frequency regions on the complex viscosity imaginary part plot are owing to the relaxations of the blend and deformed dispersed droplets, respectively. Based on these two models, six emulsion parameters (interfacial tension, relaxation times and viscosities of two components, and dispersed phase volume fraction) were investigated in terms of their effects on the shape features of the plots of the imaginary part of complex viscosity and the Cole–Cole. The results showed that the viscosities of two components and dispersed phase volume fraction play key roles in the radii of the two circular arcs on the Cole–Cole plot. Furthermore, the two circular arcs are well separated in the case of lower interfacial tensions and dispersed phase viscosities, shorter matrix relaxation times, and higher matrix viscosities and dispersed phase volume fractions. The total relaxation time of the deformed dispersed droplets increases with increasing the viscosities of two components, especially with decreasing the interfacial tension. Three types of polymer blends were prepared and their dynamic frequency sweep testing results demonstrated the effectiveness of the corresponding predicted results. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39690.