碳纳米管功能化改性聚偏氟乙烯介电复合材料的结构及性能

doi:10.11896/cldb.18120145

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Abstract Polyvinylidene fluoride (PVDF) was used as matrix, acidified multi-walled carbon nanotubes (MWCNTs-COOH) and unacidified multi-walled carbon nanotubes as functional fillers and MWCNTs-COOH/PVDF, MWCNTs/PVDF composites with different fillers contents were prepared by melt blending. FTIR, SEM, XRD, tensile test, electrical property test, DSC, and other methods were used to study the influence of MWCNTs content and before and after acidification of carbon nanotubes on thermal properties, mechanical properties and electrical properties of the prepared composites. XRD test showed that the addition of MWCNTs-COOH and MWCNTs promoted the formation of β crystal of PVDF. Mechanical analysis showed that interfacial interactions between the MWCNTs-COOH and PVDF was stronger, resulting in the higher mechanical strength of the composites. When the filler contents of MWCNTs-COOH was 12wt%, the tensile strength of the composites reached 64.6 MPa, which increased by 24% compared with pure PVDF. The dielectric property analysis showed that the unacidified multi-walled carbon nanotubes were more likely to form local conductive networks in the PVDF matrix, promoting the electron displacement polarization and improving the dielectric constant. When the contents of MWCNTs was 12wt%, the percolation threshold was reached and the dielectric constant reached 286, which was 36 times of pure PVDF. DSC test showed that with the addition of MWCNTs-COOH and MWCNTs, the crystallization temperature, melting temperature and crystallinity of the dielectric composites were higher than those of pure PVDF.

Key words： polyvinylidene fluorider multi-walled carbon nanotubes thermal performance mechanical properties dielectric properties

Published: 15 January 2020

CLC number:

TQ332

About author:: Lin Chenwas admitted to Xihua University in September 2017 to study for a master's degree in material science and engineering, focusing on the modification of polymer blends.;Jun Bianreceived his Ph.D. degree in materials phy-sical and chemical from Sun-Yat Sen University in 2009. He is currently a professor in School of Materials Science and Engineering in Xihua University. From 2012 to 2013, he was supported by the National China Scholarship Council (CSC) to study as a senior visiting scholar in the Department of Polymer Engineering at the University of Akron (UA) in USA. His research inte-rests are the design, preparation, processing and cha-racterization of polymer based nanocomposites.

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	CHEN Lin
	LIU Hongcai
	YAN Lei
	GUO Yi
	LIN Hong
	LIN Hailan
	BIAN Jun
	ZHAO Xinwei

Cite this article:

CHEN Lin,LIU Hongcai,YAN Lei, et al. Structure and Properties of Polyvinylidene Fluoride Dielectric Composites Modified by Carbon Nanotubes[J]. Materials Reports, 2020, 34(4): 4126-4131.

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http://www.mater-rep.com/EN/10.11896/cldb.18120145 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4126

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