Research on Microstructure and Electrical Resistivity of Injection Molded Metallic Fiber-Filled Polymer Composites

Abstract

The electrical resistivity of metal fiber-filled polymer composite always increases during injection molding process because the conductive fibers were easily broken down to shorter under the action of high shear stress. In order to decrease electrical resistivity of the molding, we investigated the microstructure at different layers within the molding made from stainless steel fiber-filled polypropylene and measured their resistivities. High resistive zone mediate resistive zone and low resistive zone were found within the molding. The results showed that the high resistivity zone located at the skin area of the molding where average length of filled fibers was less than other zones, and the smallest resistive zone located at the core area where most fibers preserved large ratio of length to diameter and oriented along flowing direction of the melt, and the sub-skin zone is mediate resistive zone.

Feasibility Study of Injection Mouldable Conductive Plastic for the Hearing aid Applications

“…This parameter has influenced the metal distribution inside the samples. It is already known from previous studies, that the injection speed can reduce the electrical effectiveness because it leads to a highly-oriented and less uniform distribution of the metal fibres [2]. During soldering, the electrical connection was easily established in the antennas cut from the 1.5 mm and 2 mm plates unlike the 0.5 and 1 mm ones.…”

Lightweight Polypropylene/Stainless-Steel Fiber Composite Foams with Low Percolation for Efficient Electromagnetic Interference Shielding

“…Conductive polymer composites (CPCs) are becoming promising candidates to be employed as EMI shields because they offer light weight, low cost, high processing ability, and high resistance to corrosion, and various CPCs containing conductive microsized − or nanosized − fillers have been developed for EMI shielding applications. However, CPCs are not yet very successful in replacing the metal-based shields because of the high filler loading that is required to achieve a sufficient level of shielding.…”

The electromagnetic interference shielding performance of continuous carbon fiber composites with different arrangements

“…Originally, various types of metal and their compound exhibiting high conductivity and dielectric constant were widely used to shield electrical circuits by reflection since the Faraday cage effect was found more than two centuries ago [2]. However, there are some limitations associated with metallic sheets due to their high density, high stiffness, expensive processing, and prone to oxidation [3].…”