关键词: 滑石;壳聚糖;纳米铜;导电粉体

Abstract: The talc/nano-Cu composite powder was prepared by using liquid phase reduction method in the chitosan acetic acid solution with talc as base.The physical and chemical properties, surface morphology and electrical performance of the composite powder were characterized by XRD,FT-IR,TG, SEM analysis and compression resistance test.The results show that the copper powder,with high purity and crystallinity,is successfully obtained on the surface of talcum powder.The absorption peak of the chitosan group is presented in the FT-IR spectrum of the composite powder, and it is deduced that the isolated electron pair from the N and O atoms of-NH2and-OH of chitosan bonded with Cu 2+,a way to improve the dispersion of Cu.The fastest weight loss on the TG curve of the composite powder is observed at 350 ℃,which is similar to that of chitosan and thus verifying the presence of chitosan stabilizer in the powder;the talcum powder is well-coated by flower-like nano-copper powders with particle size smaller than 100 nm; the composite powder exhibited a good conductivity that reached the requirement for conductive powder.

Key words: Talc;chitosan;nano-copper;conductive powder