Characterization of Hybridized Conductive Composites
Abstract
Injection moldable thermoplastics filled with various hybrid conductive reinforcements have been investigated for their physical/mechanical properties. The thermoplastics studied include polyphenylene sulfide (PPS), polyether etherketone (PEEK) and liquid crystal polymers (LCP's). The reinforcements included various combinations and concentrations of graphite (Gr) fibers, stainless steel (SS) fibers, nickel flakes(NiFlk) and nickel plated graphite (NiGr) fibers. Tensile, flexural, and drop weight impact tests were performed. Fracture morphology of tensile specimens was investigated using scanning electron microscopy (SEM). The distribution of fibers and flakes was observed using photomicroscopy. Electromagnetic interference (EMI) shielding effectiveness was determined in the range of 15 MHz to 1 GHz. Water absorption, density and electrical resistivity properties were also determined. Differential scanning calorimetry (DSC) was used to determine thermal properties. Four PPS composites provided at least 80 db of shielding at 80, 100, 150, 200 and 300 MHz respectively. The lowest electrical resistivity value measured was 0.60 ohm-cm for PPS/30%NIGr/10%SS. Optical microscopy revealed that PEEK Composites with similar loadings to that of PPS composites had lower void contents. Reinforced PEEK performed better mechanically than PPS composites. Composite densities range from 1.98g cc for PPS/30%NiGr/20%NiFlk to 1.47/cm3 for LCP300/30%Gr.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 25, 1986
- Accession Number
- ADA179689
Entities
People
- J. J. Reilly
- S. J. Thoman
- W. W. Lin
Organizations
- Naval Air Warfare Center Warminster