A Study of Lubricants on Silver Flakes for Microelectronics Conductive Adhesives
Loading...
Author(s)
Lu, Daoqiang
Advisor(s)
Editor(s)
Collections
Supplementary to:
Permanent Link
Abstract
Conductive adhesives are composites of polymer
matrixes and metal fillers (conductive elements). Silver (Ag) flakes
are widely used as fillers for electrically conductive adhesives
(ECA’s). Generally, there is a thin layer of organic lubricant
coated on the commercial Ag flake surface. This lubricant layer
is needed for eliminating the Ag particle agglomeration while
dispersing the Ag filler into the polymeric resin. Therefore the
lubricant influences rheology, conductivity, and other properties
of ECA’s. The nature of the lubricant on a Ag flake and
the interaction between the lubricant and the Ag flake surface
were studied by diffuse reflectance infrared spectroscopy (DRIR).
Thermal decomposition of the lubricant was studied by differential
scanning calorimetry (DSC) and thermogravimetric analysis
(TGA). In addition, the effects of some chemical compounds on
lubricant removal and the enhancement of conductivity of the
ECA were also investigated. It was found that
1) a chemical bonding was formed on the Ag flake surface
between the lubricant and Ag;
2) the short chain acids replaced the long chain lubricants;
3) an ether and a poly(ethylene glycol) enhanced electrical
conductivity by partially removing the Ag flake lubricants.
Sponsor
Date
1999-09
Extent
241233 bytes
Resource Type
Text
Resource Subtype
Article