循环吸湿及其对环氧树脂和环氧/多壁碳纳米管纳米复合材料热机械性能的影响。

Cyclic Moisture Sorption and its Effects on the Thermomechanical Properties of Epoxy and Epoxy/MWCNT Nanocomposite.

作者信息

Glaskova-Kuzmina Tatjana, Aniskevich Andrey, Sevcenko Jevgenijs, Borriello Anna, Zarrelli Mauro

机构信息

Institute for Mechanics of Materials, University of Latvia, Jelgavas 3, LV-1006 Riga, Latvia.

Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, 80055 Granatello, Portici, Italy.

出版信息

Polymers (Basel). 2019 Aug 23;11(9):1383. doi: 10.3390/polym11091383.

DOI:10.3390/polym11091383

PMID:31450722

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6781177/

Abstract

The aim of this work was to reveal the moisture absorption-desorption-resorption characteristics of epoxy and epoxy-based nanocomposites filled with different multiwall carbon nanotubes (MWCNTs) by investigating the reversibility of the moisture effect on their thermomechanical properties. Two types of MWCNTs with average diameters of 9.5 and 140 nm were used. For the neat epoxy and nanocomposite samples, the moisture absorption and resorption tests were performed in atmospheres with 47%, 73%, and 91% relative humidity at room temperature. Dynamic mechanical analysis was employed to evaluate the hygrothermal ageing effect for unconditioned and environmentally "aged" samples. It was found that moisture sorption was not fully reversible, and the extent of the irreversibility on thermomechanical properties was different for the epoxy and the nanocomposite. The addition of both types of MWCNTs to the epoxy resin reduced sorption characteristics for all sorption tests, improved the hygrothermal and reduced the swelling rate after the moisture absorption-desorption.

摘要

本工作的目的是通过研究水分对其热机械性能影响的可逆性，揭示填充不同多壁碳纳米管（MWCNT）的环氧树脂及环氧基纳米复合材料的吸湿-脱湿-再吸湿特性。使用了两种平均直径分别为9.5和140 nm的MWCNT。对于纯环氧树脂和纳米复合材料样品，在室温下于相对湿度为47%、73%和91%的气氛中进行吸湿和再吸湿试验。采用动态力学分析来评估未处理和环境“老化”样品的湿热老化效应。结果发现，吸湿并非完全可逆，且环氧树脂和纳米复合材料在热机械性能上的不可逆程度有所不同。在环氧树脂中添加这两种类型的MWCNT均降低了所有吸附试验的吸附特性，改善了湿热性能，并降低了吸湿-脱湿后的溶胀率。