Accession Number:

ADA179689

Title:

Characterization of Hybridized Conductive Composites

Descriptive Note:

Final rept. Feb 1985-Feb 1986

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE

Personal Author(s):

Report Date:

1986-07-25

Pagination or Media Count:

46.0

Abstract:

Injection moldable thermoplastics filled with various hybrid conductive reinforcements have been investigated for their physicalmechanical properties. The thermoplastics studied include polyphenylene sulfide PPS, polyether etherketone PEEK and liquid crystal polymers LCPs. The reinforcements included various combinations and concentrations of graphite Gr fibers, stainless steel SS fibers, nickel flakesNiFlk 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 PPS30NIGr10SS. 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 PPS30NiGr20NiFlk to 1.47cm3 for LCP30030Gr.

Subject Categories:

  • Laminates and Composite Materials
  • Electricity and Magnetism
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE