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首页> 外文期刊>International journal of nanomechanics science and technology >ENVIRONMENTAL EFFECTS ON MATERIAL PROPERTIES OF MWCNT REINFORCED NANOCOMPOSITES
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ENVIRONMENTAL EFFECTS ON MATERIAL PROPERTIES OF MWCNT REINFORCED NANOCOMPOSITES

机译：MWCNT增强纳米复合材料材料性能的环境影响

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摘要

This research work presents the effects of environmental conditions on mechanical properties of nanocomposites. Different contents of multi-walled carbon nanotubes (MWCNTs) were added as reinforcements into an isophthalic polyester (iPE) matrix. Two MWCNT contents were consid ered: 0.5 wt.% and 1.0 wt.%. Three environmental temperatures were applied: room temperature (25℃), dry-heating conditions (75℃), and subambient conditions (-24 ℃). The specimens were exposed to the different combinations of conditions for 250 h and 500 h, respectively. Material properties of nanocomposites were evaluated by the tensile test, shear test, and dynamic mechani cal analysis (DMA) test. Tensile test results showed that nanocomposites had higher Young's modulus and ultimate tensile strength at room temperature compared to neat isophthalic polyes ter. Young's modulus, tensile strength, and shear strength of nanocomposites exposed to environ mental conditions, especially the dry-heating ones, decreased significantly compared to the specimens exposed to subambient conditions. However, shear strength of nanocomposites was not very sensitive to environmental conditions regardless of the exposure time. DMA test results showed that nanocomposites had higher glass transition temperatures than neat isophthalic poly ester due to the reduction of the mobility in polyester matrix around MWCNTs.
机译：这项研究工作提出了环境条件对纳米复合材料力学性能的影响。将不同含量的多壁碳纳米管（MWCNT）作为增强材料添加到间苯二甲酸聚酯（iPE）基质中。考虑了两种MWCNT含量：0.5重量％和1.0重量％。施加三个环境温度：室温（25℃），干热条件（75℃）和环境温度（-24℃）。将样品分别暴露于不同的条件下250小时和500小时。纳米复合材料的材料性能通过拉伸试验，剪切试验和动态力学分析（DMA）试验进行评估。拉伸试验结果表明，与纯间苯二甲酸聚酯相比，纳米复合材料在室温下具有更高的杨氏模量和极限拉伸强度。与暴露于环境条件下的样品相比，暴露于环境条件下（尤其是干热条件下）的纳米复合材料的杨氏模量，拉伸强度和剪切强度显着降低。然而，无论暴露时间如何，纳米复合材料的剪切强度对环境条件不是很敏感。 DMA测试结果表明，由于在MWCNTs周围聚酯基质中迁移率的降低，纳米复合材料的玻璃化转变温度高于纯间苯二甲酸聚酯。

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