✦ LIBER ✦

Ionic thermoplastic elastomer based on maleated epdm rubber. I. Effect of zinc stearate

✍ Scribed by Santanu Datta; S. K. De; E. G. Kontos; J. M. Wefer

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 669 KB
Volume: 61
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19960705)61:1<177::aid-app19>3.0.co;2-4

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✦ Synopsis

Neutralization of maleated EPDM rubber by zinc oxide results in an ionic elastomer. The rate and extent of the neutralization reaction increase by addition of stearic acid. Although the rubber is not easy processable as such, incorporation of zinc stearate at a loading of 30 phr makes the rubber behave like a thermoplastic during high temperature (>15OoC) processing. Furthermore, zinc stearate causes improvement in the physical properties of the rubber under ambient conditions. It is believed that zinc stearate acts as a reinforcing filler under ambient conditions and as a plasticizer for the ionic domains a t higher temperature (that is, above its melting point, 128°C). The conclusions are based on the results of dynamic mechanical, rheological, and infrared spectroscopic studies.

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