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Use of carbon fibril additives to reduce the dc resistivity of elastomer‐based composites
Author(s) -
Farriss C. W.,
Kelley F. N.,
Von Meerwall E.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070550612
Subject(s) - materials science , isophorone diisocyanate , composite material , electrical resistivity and conductivity , fibril , polybutadiene , elastomer , propellant , hydroxyl terminated polybutadiene , volume (thermodynamics) , carbon fibers , polycaprolactone , polyurethane , composite number , polymer , copolymer , chemistry , biochemistry , engineering , physics , organic chemistry , quantum mechanics , electrical engineering
We have prepared insert model solid rocket propellants of two kinds, polycaprolactone (PCP) networks highly (60%) plasticized with triacetin and hydroxyl‐terminated polybutadiene (HTPB) cross‐linked with isophorone diisocyanate, both filled with over 65% NaSO 4 and Al powders as well as traces of fine carbon fibrils 100 Å thick and several micrometers long. Sheets of these dieletric composites were used for dc surface and volume electrical resistivities near room temperature. Addition of less than 1% fibrils in the PCP composites reduces volume resistivity by a factor of 10. The amount required for HTPB is only 0.1% leaving processability unaffected; resistivity reduction rises from one to nearly four orders of magnitude as potential differnce in increased from 10 to 500 V. Addition of fibrils to HTPB composites is a promising candidate for minimizing the incidence of dangerous electric discharge events. © 1995 John Wiley & Sons, Inc.