Effect of E/P ratio on the rheology and morphology of crosslinkable polyethylene and EPDM blends
- 5 January 1990
- journal article
- research article
- Published by Wiley in Journal of Applied Polymer Science
- Vol. 39 (1), 49-62
- https://doi.org/10.1002/app.1990.070390105
Abstract
Effects of E/P ratio of the EPDM rubber on the flow behavior and morphology of the crosslinkable polyethylene and EPDM blends have been studied as a function of shear rate and processing temperature. High‐E/P‐ratio EPDM rubber exhibits high viscosities within the temperature range studied but the extrudate swell is higher for the low E/P ratio EPDM. Shear modulus, stored elastic energy and flow activation energy are higher for high E/P ratio EPDM but relaxation time is higher for low E/P ratio EPDM. At a particular blend ratio these rheological parameters show a change in their pattern. This point of change in pattern occurs at a lower level of EPDM having a high E/P ratio; this suggests an early phase inversion as corroborated by the SEM studies. Melt fracture occurs to a larger extent for the low E/P ratio EPDM in its blends with XLPE.Keywords
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