文献类型：期刊文献

英文题名：Synthesis of cobalt coated nickel powders for improving the stability of the resistivity of PPTC materials

作者：Fang, Bin[1];Gao, Sheng[1];Ge, Xueping[1];Yang, Cunzhong[1]

机构：[1]E China Univ Sci & Technol, Sch Sci, Inst Nucl Technol & Applicat, Shanghai 200237, Peoples R China

年份：2013

卷号：127

期号：1

起止页码：270

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20124215581621);WOS:【SCI-EXPANDED(收录号:WOS:000309594400034)】；

基金：This work was supported by National Natural Science Foundation of China (51103039) and Program for outstanding young teachers of ECUST (YK0157134).

语种：英文

外文关键词：surface; fillers; polyethylene; Ni powders; stability

摘要：Nickel powders coated by cobalt (Co@Ni powders) on the surface have been obtained by reduction in the ethylene glycol. The morphology and composition were characterized by scanning electron microscope and energy dispersive X-ray spectroscopy. The valence states of cobalt in the sample were determined by X-ray photoelectron spectroscopy. The Co@Ni powders were used as the electrically conductive fillers in the polymeric positive temperature coefficient (PPTC) materials in which polyethylene was used as the matrix. The stability of the resistivity of PPTC materials has been improved due to the protection and electrical conductivity of the cobalt layers on the surface of Ni powders. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012