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The role of tackifiers on the auto-adhesion behavior of EPDM rubber

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Abstract

The article describes the effect of hydrocarbon (HC) and coumarone-indene (CI) resin tackifiers on autohesion behavior of ethylene propylene diene polymethylene (EPDM) rubber. The viscoelastic behavior and nature of compatibility of EPDM/tackifier blends were studied by means of dynamic mechanical analysis. Furthermore, scanning electron microscopy and atomic force microscopy were used to understand the compatibility of the EPDM/tackifier blends. The HC tackifying resin modified the viscoelastic properties of the EPDM rubber in such a way that it behaved as a plasticizer at lower frequency by reducing the storage modulus and filler at higher frequency by increasing the storage modulus. On the contrary, the CI modified EPDM rubber did not show similar behavior; the modulus enhanced throughout the entire frequency range. The viscosity of the matrix was found to be highly governed by the compatibility as well as amount of tackifier present in the blend. In order to explain the tack behavior, several tack governing factors such as green strength, creep compliance, entanglement molecular weight, relaxation time, self-diffusion coefficient, and monomer friction coefficient (ζ0) were investigated. The tack strength increased with HC tackifier loading up to 24 parts per hundred grams of rubber (phr), beyond which a plateau region was observed. A maximum of 196% improvement was observed at 24 phr HC loaded sample as compared to gum EPDM rubber devoid of tackifier. Conversely, there was a marginal improvement of tack strength (36%) up to 8 phr loading for the system containing CI, beyond which it dropped.

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Acknowledgements

One of the authors (Ganesh C. Basak) gratefully acknowledges All India Council for Technical Education (AICTE), New Delhi, for providing financial assistance.

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  1. Anil K. Bhowmick

    Present address: Indian Institute of Technology, Patna, 800013, India

Authors and Affiliations

  1. Rubber Technology Centre, Indian Institute of Technology, Kharagpur, 721302, India

    Ganesh C. Basak & Anil K. Bhowmick

  2. Department of Polymer Science and Technology, University of Calcutta, Calcutta, 700009, India

    Abhijit Bandyopadhyay

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  1. Ganesh C. Basak
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  2. Abhijit Bandyopadhyay
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  3. Anil K. Bhowmick
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Correspondence to Anil K. Bhowmick.

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Basak, G.C., Bandyopadhyay, A. & Bhowmick, A.K. The role of tackifiers on the auto-adhesion behavior of EPDM rubber. J Mater Sci 47, 3166–3176 (2012). https://doi.org/10.1007/s10853-011-6151-y

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  • DOI: https://doi.org/10.1007/s10853-011-6151-y

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