Tack and Green Strength of Blends of Bromobutyl and EPDM Rubbers. I. Unfilled Gum Blends |
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Authors: | T. K. Bhaumik B. R. Gupta A. K. Bhowmick |
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Affiliation: | Rubber Technology Centre, Indian Institute of Technology , Kharagpur, 721302, India |
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Abstract: | Polymer blends are gaining importance in recent years because they provide a compromise of properties. In this paper, tack and green strength of several blends of EPDM and bromobutyl rubbers (BIIR) have been studied over a wide range of temperaures, contact times and rates. Tack increases with increase in contact time and with increase in contact temperature up to 47°C for a particular blend. At a much higher temperature the tack strength falls gradually. Green strength increases with increase in bromobutyl content and decreases with temperature. Tack index, a ratio of tack strength divided by the cohesive strength under the same geometry, decreases slowly with the test temperature. At a 50:50 ratio of BIIR:EPDM, the two rubbers form an interpenetrating network as observed under the phase contrast microscope. |
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Keywords: | Tack strength Green strength Contact time Bromobutyl rubber EPDM rubber Tack index |
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