Insight into the carbon nanotube agglomeration deteriorated fire safety of epoxy

doi:10.1016/j.diamond.2023.110443

IMR OpenIR

	Insight into the carbon nanotube agglomeration deteriorated fire safety of epoxy
	Wang, Qi 1,2; Mao, Yangjiahua 1; Dong, Yujie 1; Yang, Xuezheng 3; Zhong, Bingwei 4; Liu, Yaqing 1
通讯作者	Zhong, Bingwei(20140040@zafu.edu.cn) ; Liu, Yaqing(lyq@nuc.edu.cn)
	2023-12-01
发表期刊	DIAMOND AND RELATED MATERIALS
ISSN	0925-9635
卷号	140 页码:9
摘要	Carbon nanotube (CNT)/epoxy composite is a star lightweight structure material. However, the reason why welldispersed CNTs retard the combustion of epoxy while CNT agglomerations always accelerate it instead seems still confusing, which severely limits the further understanding and design of the high-performance CNT/epoxy composite. Herein, with CNT agglomerations inside, 4coCNT/epoxy composite and 2coCNT0.5/epoxy composite were prepared to reveal the truth of the dramatically worsened flame retarding performances compared with their expected values. The void-rich CNT agglomerations were proved to be qualified candlewick-like fillers after directly observing the formations of micron-diameter fiber-like agglomerations by scanning electron microscope (SEM) and X-ray computed tomography (XCT); verifying the ability of CNT agglomerations to allow the epoxy melt to wet, spread, and flow on their surface. The thermogravimetric analysis (TG) and the limited oxygen index (LOI) results suggested that fire is necessary for the CNT agglomeration to worsen the thermostability of composites. With the presence of the liquid-phase combustible epoxy melt in the fire captured by a high-definition camera, all the requirements to induce the candlewick effect were satisfied. Ruling out a popular explanation that the agglomerated CNTs promote polymers' inflammability by cracking chars created during the combustion, a similar but distinct candlewick effect was then proposed and specially defined as "nano-candlewick effect" in the present study. The nano-candlewick effect defeated the flame-retarding free radical scavenging effect of the dangling bonds from coCNT and coCNT0.5, and further worsened the flame retardancy of the epoxy matrix. The detailed working mechanism of the nano-candlewick effect was described. The mechanism is supposed to be appropriate for polymer nanocomposites with candlewick-like fillers inside, and account for the dramatically accelerated combustion.
关键词	Nano-candlewick effect Carbon nanotube Epoxy Fire safety
资助者	Shanxi Province 1331 Project Key Innovation Team of Polymeric Functional New Materials and Shanxi Province Innovative Disciplinary Group of New Materials Industry
DOI	10.1016/j.diamond.2023.110443
收录类别	SCI
语种	英语
资助项目	Shanxi Province 1331 Project Key Innovation Team of Polymeric Functional New Materials and Shanxi Province Innovative Disciplinary Group of New Materials Industry
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:001149329200001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/183899
专题	中国科学院金属研究所
通讯作者	Zhong, Bingwei; Liu, Yaqing
作者单位	1.North Univ China, Res Ctr Engn Technol Polymer Composites Shanxi Pro, Sch Mat Sci & Engn, Shanxi Key Lab Nano Funct Composite Mat, Taiyuan 030051, Shanxi, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 3.Baotou Res Inst Rare Earths, Baotou 014020, Inner Mongolia, Peoples R China 4.Zhejiang A&F Univ, Jiyang Coll, Zhuji 311800, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Wang, Qi,Mao, Yangjiahua,Dong, Yujie,et al. Insight into the carbon nanotube agglomeration deteriorated fire safety of epoxy[J]. DIAMOND AND RELATED MATERIALS,2023,140:9.
APA	Wang, Qi,Mao, Yangjiahua,Dong, Yujie,Yang, Xuezheng,Zhong, Bingwei,&Liu, Yaqing.(2023).Insight into the carbon nanotube agglomeration deteriorated fire safety of epoxy.DIAMOND AND RELATED MATERIALS,140,9.
MLA	Wang, Qi,et al."Insight into the carbon nanotube agglomeration deteriorated fire safety of epoxy".DIAMOND AND RELATED MATERIALS 140(2023):9.