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首页> 外文期刊>Journal of Applied Polymer Science >Improving the dispersion of MWCNT and MMT in PVDF melts employing controlled extensional flows
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Improving the dispersion of MWCNT and MMT in PVDF melts employing controlled extensional flows

机译：改善MWCNT和MMT在采用受控扩展流动的PVDF熔体中的分散

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摘要

Poly (vinylidene fluoride) (PVDF) has been widely explored to produce polymer nanocomposites possessing outstanding combinations of properties. In this work, the impact of extensional melt flows on the dispersion, relaxation and crystallinity of PVDF nanocomposites filled with multiwalled carbon nanotubes (MWCNT) and montmorillonites (MMT) was studied. Extrusion was employed to produce nanocomposites containing 3 wt% of fillers, named: (i) PVDF/3 wt% MWCNT, (ii) PVDF/3wt%MMT, and (iii) PVDF/1.5wt%MWCNT/1.5 wt% MMT. The results showed that applying a sequence of extensional flows through the melts improved the dispersion of both fillers in the PVDF matrix. Moreover, extensional flows significantly enhanced the viscosity and relaxation of MWCNT nanocomposite, but had marginal effects on MMT nanocomposite. On the other hand, MMT favored the crystallization of the beta piezoelectric phase of PVDF over the alpha phase and the extensional flow enhanced its crystallinity content. Therefore, these new insights prospect a vast horizon toward the use of extensional flows for tailoring synergic combinations of properties in hybrid PVDF/MWCNT/MMT systems.
机译：聚偏氟乙烯（PVDF）被广泛用于制备具有优异性能组合的聚合物纳米复合材料。本文研究了拉伸熔体流动对多壁碳纳米管（MWCNT）和蒙脱土（MMT）填充PVDF纳米复合材料的分散性、松弛性和结晶性的影响。采用挤出法制备了含有3 wt%填料的纳米复合材料，命名为：（i）PVDF/3 wt%MWCNT，（ii）PVDF/3 wt%MMT，以及（iii）PVDF/1.5wt%MWCNT/1.5wt%MMT。结果表明，在熔体中施加一系列拉伸流动，改善了两种填料在PVDF基体中的分散性。此外，拉伸流动显著提高了MWCNT纳米复合材料的粘度和松弛度，但对MMT纳米复合材料的影响不大。另一方面，与α相相比，蒙脱土有利于PVDF的β压电相结晶，拉伸流动增强了其结晶度。因此，这些新的见解为在PVDF/MWCNT/MMT混合系统中使用拉伸流来裁剪性能的协同组合开辟了广阔的前景。

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