Vulcanizing System Dependence of the Rubbery Swelling, Dielectric and Doppler Shift Characteristics of IIR/EPDM Blends | ||||
| Egyptian Journal of Solids | ||||
| Article 12, Volume 29, Issue 1, 2006, Page 181-192 PDF (316.19 K) | ||||
| DOI: 10.21608/ejs.2006.149152 | ||||
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| Abstract | ||||
| Effect of the vulcanizing system on the rubbery swelling, dielectric and Doppler shift characteristics of IIR/EPDM -carbon black (GPF) blends have been studied. Three different vulcanizing systems were used in this study namely, elemental sulphur (S-system), TMTD (T-system) and elemental sulphur + TMTD (M-system). The dielectric behaviour of the tested blends has been studied in the frequency range from 1KHz to 100KHz and in the temperature range from 40oC to 140oC. It has been observed that samples vulcanized with (T-system) give a higher dielectric permittivity values compared with those crosslinked with (S-system) or (M-system). The presence of the polar group < br />C=S in the TMTD molecules is the most effective factor on the dielectric properties of the tested blends. The swelling behaviour and the positron annihilation characteristics by means of Doppler Broadening parameters for the tested blends have been investigated. The positron annihilation characteristics supported the swelling and dielectric measurements obtained. | ||||
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