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Dynamic viscoelastic properties of carbon black loaded closed‐cell microcellular ethylene‐propylene‐diene rubber vulcanizates: Effect of blowing agent, temperature frequency, and strain
Author(s) -
Guriya K. C.,
Tripathy D. K.
Publication year - 1996
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/(sici)1097-4628(19960801)61:5<805::aid-app12>3.0.co;2-w
Subject(s) - materials science , dynamic mechanical analysis , dynamic modulus , natural rubber , composite material , viscoelasticity , dissipation factor , modulus , carbon black , isothermal process , ethylene propylene rubber , tangent modulus , rheometry , blowing agent , thermodynamics , polymer , dielectric , copolymer , physics , optoelectronics , polyurethane
Dynamic mechanical analysis of carbon black loaded solid and closed‐cell microcellular ethylene‐propylene‐diene (EPDM) vulcanizates was studied at four frequencies of 3.5, 11, 35, and 110 Hz and temperatures from −100 to 150°C. A plot of the log of the storage modulus bears a linear relationship with the log of density for solid as well as closed‐cell microcellular rubber. The slope of the line is found to be temperature‐dependent. The relative storage modulus decreases with decrease in the relative density. It was also observed that the storage modulus and tan δ are both frequency‐ and temperature‐dependent. The storage modulus results are superposed to form master curves of the modulus vs. Iog temperature‐reduced frequency, using shift factors calculated by the Arrhenius equation. Strain‐dependent isothermal dynamic mechanical analysis was carried out for DSA varying from 0.07 to 5%. The effect of blowing agent loading on the storage modulus ( E′ ) and loss tangent (tan δ) were also studied. Cole‐Cole plots of microcellular rubber shows a circular arc relationship with the density. Plots of tan δ against E′ were found to exhibit a linear relationship. © 1996 John Wiley & Sons, Inc.