Dynamic viscoelastic properties of carbon black loaded closed-cell microcellular ethylene-propylene-diene rubber vulcanizates: Effect of blowing agent, temperature frequency, and strain

✍ Scribed by K. C. Guriya; D. K. Tripathy

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 617 KB
• Volume: 61
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960801)61:5<805::aid-app12>3.0.co;2-w

✦ Synopsis

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 6 are both frequency-and temperature-dependent. The storage modulus results are superposed to form master curves of the modulus vs. log temperature-reduced frequency, using shift factors calculated by the Arrhenius equation. Straindependent 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 6 ) were also studied. Cole-Cole plots of microcellular rubber shows a circular arc relationship with the density. Plots of tan 6 against E' were found to exhibit a linear relationship.