Investigation of free volume and damping property for polycarbonate/multiwalled carbon nanotube composites by positron annihilation technology

Investigation of free volume and damping property for polycarbonate/multiwalled carbon nanotube composites by positron annihilation technology
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正电子湮没技术研究聚碳酸酯/多壁碳纳米管复合材料的自由体积和阻尼性能

DOI:
10.1002/app.36706
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发表时间:
2012-09
影响因子:
3
通讯作者:
Wang, Bo
Wang, Bo
中科院分区:
化学3区
文献类型:
--
作者:
Yan, Xiaoli;Gong, Jing;Wang, Junjun;Wang, Bo

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研究了聚碳酸酯/多壁碳纳米管(PC/MWCNT)复合材料的微观结构和阻尼特性。动态力学分析结果表明,阻尼因子和能量损失分数w值显着增加。特别地,在140至150°C的温度范围内观察到阻尼因子的近300%的改善。正电子湮没寿命的测量表明,无论是o-Ps寿命和自由体积的增加与多壁碳纳米管含量,导致玻璃化转变温度的降低和阻尼性能的增加。首次观察到阻尼、力学性能和自由体积之间的关系,即自由体积的增加导致拉伸强度的降低和阻尼的增加。多壁碳纳米管的界面摩擦滑移和自由体积是决定PC/MWCNT复合材料阻尼性能的重要因素。© 2012 Wiley Periodicals,Inc.应用聚合物科学杂志,2012年
Microstructure and damping characteristics were investigated for polycarbonate/multiwalled carbon nanotube (PC/MWCNT) composites. Dynamic mechanical analysis results show that the damping factor and the value of the energy loss fraction w are significantly increased. Especially, nearly 300% improvement in damping factor is observed in the temperature range from 140 to 150°C. Positron annihilation lifetime measurements indicate that both the o-Ps lifetime and the free volume increase with increasing MWCNT content, leading to decrease in the glass transition temperature and increase in the damping properties. The relationships among the damping, mechanical property, and the free volume have been first observed, that is, the increase of the free volume brings about a reduction in tensile strength and an increase in damping. The interfacial friction slipping of MWCNTs and the free volume play an important role in determining the damping property of PC/MWCNT composites. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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