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首页> 美国卫生研究院文献>Polymers >Cyclic Moisture Sorption and its Effects on the Thermomechanical Properties of Epoxy and Epoxy/MWCNT Nanocomposite
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Cyclic Moisture Sorption and its Effects on the Thermomechanical Properties of Epoxy and Epoxy/MWCNT Nanocomposite

机译：循环吸湿及其对环氧树脂和环氧树脂/ MWCNT纳米复合材料热力学性能的影响

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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.
机译：这项工作的目的是通过研究水分对其热机械性能的可逆性，揭示环氧树脂和填充了不同的多壁碳纳米管（MWCNT）的基于环氧的纳米复合材料的吸湿-解吸-再吸收特性。使用两种平均直径为9.5和140 nm的MWCNT。对于纯净的环氧树脂和纳米复合材料样品，在室温，相对湿度为47％，73％和91％的大气中进行了吸湿和再吸收测试。动态力学分析用于评估未经条件处理和环境“老化”的样品的湿热老化效果。发现水分吸收不是完全可逆的，并且对于环氧树脂和纳米复合材料，热机械性质的不可逆程度不同。在环氧树脂中添加两种类型的MWCNT会降低所有吸附测试的吸附特性，改善吸湿性并降低吸湿-解吸后的溶胀率。

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