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Stability of electrical properties of carbon black‐filled rubbers
Author(s) -
Podhradská Silvia,
Prokeš Jan,
Omastová Mária,
Chodák Ivan
Publication year - 2009
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.29828
Subject(s) - carbon black , materials science , composite material , natural rubber , styrene butadiene , electrical resistivity and conductivity , epdm rubber , thermal stability , ethylene propylene rubber , composite number , conductivity , styrene , polypropylene , copolymer , polymer , chemical engineering , chemistry , electrical engineering , engineering
Conducting composites were prepared by melt mixing of ethylene–propylene–diene terpolymer (EPDM) or styrene‐butadiene rubber (SBR) and 35 wt % of carbon black (CB). Stability of electrical properties of rubber/CB composites during cyclic thermal treatment was examined and electrical conductivity was measured in situ . Significant increase of the conductivity was observed already after the first heating–cooling cycle to 85°C for both composites. The increase of conductivity of EPDM/35% CB and SBR/35% CB composites continued when cyclic heating‐cooling was extended to 105°C and 125°C. This effect can be explained by reorganization of conducting paths during the thermal treatment to the more conducting network. EPDM/35% CB and SBR/35% CB composites exhibited very good stability of electrical conductivity during storage at ambient conditions. The electrical conductivity of fresh prepared EPDM/35% CB composite was 1.7 × 10 −2 S cm −1 , and slightly lower conductivity value 1.1 × 10 −2 S cm −1 was measured for SBR/35% CB. The values did not significantly change after three years storage. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009