剪切流动和碳纳米管的存在对聚丙烯基纳米复合材料的结晶行为和电性能的并发影响:结构-性能综合研究

IF 2.3 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES
Younes Alimoradi, Maryam Nourisefat, Arman Farzaneh, Hossein Nazokdast
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引用次数: 0

摘要

聚合物基体中的纳米粒子含量会影响其对制造过程中施加的剪切流的响应。有鉴于此,本研究调查了碳纳米管(CNT)的存在和剪切应用对聚丙烯(PP)基纳米复合材料的流变性能、电性能和结晶行为的影响。流变分析结果表明,类固行为随 CNT 含量的增加而增加,当 CNT 含量为 2 wt% 时,类固行为显著增加。等温结晶结果证实,结晶温度随 CNT 含量的增加而成正比增加,但不随剪切而变化。非等温结晶结果证实,结晶动力学随着碳纳米管含量的增加而加快,这种效应在剪切时更为明显。热分析结果证实,随着碳纳米管含量的增加,熔化温度略有下降,结晶度几乎保持不变,最高可达 2%。然而,当碳纳米管的含量增加到 4% 时,结晶度却因限制结晶而显著下降。当这种纳米复合材料受到剪切时,结晶度增加了。电导率测量结果表明,电导率随碳纳米管含量的增加而增加,而随剪切力的增加而降低,并且纳米复合材料对剪切力的易损性随碳纳米管含量的增加而降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Concurrent effect of shear flow and CNT presence on crystallization behavior and electrical properties of polypropylene based nanocomposites: A comprehensive structure-property investigation
The loading of nanoparticle in the polymer matrix affects their response to shear flows applied during the fabrication process. With this in mind, in the present study, the concurrent effect of carbon nanotube (CNT) presence and shear application on the rheological and electrical properties as well as on the crystallization behavior of polypropylene (PP) based nanocomposites has been investigated. The results of rheological analyses showed that the solid-like behavior increases in proportion to the CNT content, and a remarkable increase in the solid-like behavior is obtained at a CNT content of 2 wt%. The isothermal crystallization results corroborated that crystallization temperature increases proportionally with the CNT content, however does not change with shearing. The non-isothermal crystallization findings confirmed that crystallization kinetics promotes with increasing CNT content, and this effect becomes more pronounced with shearing. The results of thermal analysis confirmed that the melting temperature decreases slightly, and the crystallinity remains almost unchanged with increasing CNT content up to 2%. However, when the CNT content rose up to 4%, the crystallinity decreased significantly due to confined crystallization. When this nanocomposite was subjected to shearing, the crystallinity increased. The results of electrical conductivity measurement revealed that the conductivity increases with increasing CNT content, while it decreases with shearing and the vulnerability of nanocomposites to shearing decreases with increasing CNT content.
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来源期刊
Journal of Composite Materials
Journal of Composite Materials 工程技术-材料科学:复合
CiteScore
5.40
自引率
6.90%
发文量
274
审稿时长
6.8 months
期刊介绍: Consistently ranked in the top 10 of the Thomson Scientific JCR, the Journal of Composite Materials publishes peer reviewed, original research papers from internationally renowned composite materials specialists from industry, universities and research organizations, featuring new advances in materials, processing, design, analysis, testing, performance and applications. This journal is a member of the Committee on Publication Ethics (COPE).
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