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The effect of thermal stresses on the EMI (electromagnetic interference) shielding of conductive plastics
Author(s) -
Bigg D. M.
Publication year - 1986
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750070202
Subject(s) - materials science , composite material , graphite , temperature cycling , copper , thermal conductivity , electromagnetic shielding , electrical conductor , carbon black , polymer , conductivity , electrical resistivity and conductivity , metal , thermal , metallurgy , natural rubber , chemistry , physics , meteorology , electrical engineering , engineering
The electrical properties of a number of filled and coated plastics were examined after subjecting the materials to rigorous thermal cycling between −20 and 80°C. Filled compounds that obtained their conductivity through the addition of carbon based conductive fillers maintained their conductivity throughout the thermal cycling. Compositions which contained metal fillers were able to maintain their conductivity only when a high temperature thermally stable polymer was used as the polymer matrix. Plaques coated by a zinc arc spray or with acrylic paints containing graphite, silver, and nickel particles were unaffected by thermal cycling. Plaques coated with an acrylic paint containing copper particles lost most of their conductivity during the changes in sample temperature.