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首页> 外文期刊>Journal of Applied Polymer Science >Advanced ultra-high molecular weight polyethylene/antioxidant-functionalized carbon nanotubes nanocomposites with improved thermo-oxidative resistance
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Advanced ultra-high molecular weight polyethylene/antioxidant-functionalized carbon nanotubes nanocomposites with improved thermo-oxidative resistance

机译：先进的超高分子量聚乙烯/抗氧化剂功能化碳纳米管，具有改善的抗热氧化性

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摘要

Multiwalled carbon nanotubes (CNTs) functionalized with hindered phenol moieties are dispersed in ultra-high molecular weight polyethylene (UHMWPE), and the stabilizing action of the antioxidant (AO) functionalized CNTs (AO-f-CNTs) is studied through a combination of rheological and spectroscopic (FT-IR) analyses. The effectiveness of two alternative compounding methods, namely hot compaction (HC) and melt mixing (MM), is compared. The combination of high temperature and mechanical stress experienced during MM brings about noticeable degradation phenomena of the matrix already in the course of the compounding step. Differently, the milder conditions of the HC process preserve the stability of the polymer, making this method preferable when dealing with highly viscous matrices. In addition, HC guarantees a better CNT dispersion, allowing for the maximization of the stabilizing action of the AO grafted on the nanotubes. As a result, the HC samples exhibit improved thermo-oxidative resistance despite the very low amount of AO grafted onto the CNTs. Besides demonstrating the effectiveness of our AO-f-CNTs as stabilizers for polymer matrices, our results prove that CNTs can serve as a support on which grafting specific functional molecules to be dispersed in a host polymer matrix. (C) 2015 Wiley Periodicals, Inc.
机译：将受阻酚部分官能化的多壁碳纳米管（CNT）分散在超高分子量聚乙烯（UHMWPE）中，并通过流变学研究抗氧化剂（AO）官能化的CNT（AO-f-CNTs）的稳定作用和光谱（FT-IR）分析。比较了两种替代混合方法的有效性，即热压实（HC）和熔融混合（MM）。在MM中经历的高温和机械应力的结合已经在混合步骤的过程中引起基体的明显降解现象。不同的是，HC工艺的较温和条件保留了聚合物的稳定性，这使得该方法在处理高粘度基质时更为可取。另外，HC保证了更好的CNT分散性，从而使接枝在纳米管上的AO的稳定作用最大化。结果，尽管极少量的AO接枝到CNT上，HC样品仍表现出改善的抗热氧化性。除了证明我们的AO-f-CNT作为聚合物基质稳定剂的有效性外，我们的结果还证明CNT可以作为支撑物，将接枝的特定功能分子分散在主体聚合物基质中。 （C）2015年Wiley Periodicals，Inc.

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