Thermal Annealing Induced Enhancements of Electrical Conductivities and Mechanism for Multiwalled Carbon Nanotubes Filled Poly(Ethylene-co-Hexene) Composites

doi:10.1021/am302597f

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	Thermal Annealing Induced Enhancements of Electrical Conductivities and Mechanism for Multiwalled Carbon Nanotubes Filled Poly(Ethylene-co-Hexene) Composites
	Li, Wenlin 1; Zhang, Yaqiong 1; Yang, Jingjing 1; Zhang, Jun 2; Niu, Yanhua 2; Wang, Zhigang 1
刊名	ACS APPLIED MATERIALS & INTERFACES
	2012-12-01
卷号	4 期号:12 页码:6468-6478
关键词	Polyethylene Carbon Nanotube Aspect Ratio Network Diffusion Electrical Conductivity
ISSN号	1944-8244
DOI	10.1021/am302597f
英文摘要	Thermal annealing-induced enhancements of electrical conductivities at the temperature higher than the melting point of poly(ethylene-co-hexene) matrix for multiwalled carbon nanotubes filled poly(ethylene-co-hexene) (MWCNTs/PEH) composites were investigated by electrical conductivity measurements. Two types of MWCNTs with low and high aspect ratios (4 and 31) were added as fillers into PEH matrix, respectively for comparison study purpose. The morphological changes due to annealing for MWCNTs/PEH composites were observed by SEM. The formation of MWCNT networks in the composites were dearly demonstrated by rheological measurements. It is surprisingly found that the electrical conductivity for MWCNTs/PEH composites with high MWCNT concentrations increases obviously with annealing time of 40 mm and the maximum increment approaches about 3 orders of magnitude with annealing time of 120 min. The increase of electrical conductivity of MWCNTs/PEH composites depends on MWCNT content, MWCNT aspect ratio and annealing time. SEM results clearly reveal that micrometer-sized MWCNT aggregates are broken down and more loosely packed MWCNT networks form due to annealing. Different types of networks in the composites are responsible for the evolutions of rheological (MWCNT network and PEH chain-MWCNT combined network) and electrical conductivity properties (tube tube contacting MWCNT network). The reconstruction of MWCNT network during annealing is attributed to rotational diffusion of MWCNTs in PEH matrix at high temperature and the length of MWCNTs shows significant effect on this. The obvious enhancements of electrical conductivities can be ascribed to the thermal annealing-induced formation of loosely packed more homogeneous networks through non-Brownian motions.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000313149800013
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/48019]
专题	中国科学院化学研究所
通讯作者	Wang, Zhigang
作者单位	1.Univ Sci & Technol China, CAS Key Lab Soft Matter Chem, Dept Polymer Sci & Engn, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Li, Wenlin,Zhang, Yaqiong,Yang, Jingjing,et al. Thermal Annealing Induced Enhancements of Electrical Conductivities and Mechanism for Multiwalled Carbon Nanotubes Filled Poly(Ethylene-co-Hexene) Composites[J]. ACS APPLIED MATERIALS & INTERFACES,2012,4(12):6468-6478.
APA	Li, Wenlin,Zhang, Yaqiong,Yang, Jingjing,Zhang, Jun,Niu, Yanhua,&Wang, Zhigang.(2012).Thermal Annealing Induced Enhancements of Electrical Conductivities and Mechanism for Multiwalled Carbon Nanotubes Filled Poly(Ethylene-co-Hexene) Composites.ACS APPLIED MATERIALS & INTERFACES,4(12),6468-6478.
MLA	Li, Wenlin,et al."Thermal Annealing Induced Enhancements of Electrical Conductivities and Mechanism for Multiwalled Carbon Nanotubes Filled Poly(Ethylene-co-Hexene) Composites".ACS APPLIED MATERIALS & INTERFACES 4.12(2012):6468-6478.