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Yielding behaviour of thermoplastic/elastomer blends cured by gamma irradiation

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Abstract:

Mechanical blends of thermoplastic medium density polyethylene (MDPE) and elastomeric ethylene propylene diene monomer (EPDM) have been prepared with a fixed composition of 60/40 wt%. They have been used either in their gum form or loaded with two different reinforcing fillers, high abrasion furnace (HAF) carbon black or precipitated SiO2 (Hi Sil) of concentration 25–100 phr (parts per hundred parts of resin) with respect to the blend. Curing was achieved by gamma irradiation. Yielding properties (yield stress, yield strain and cold drawing) have been followed as a function of irradiation dose for different blend compositions. Yield stress values increased with irradiation dose and with the content of the reinforcing filler, but yield strain and cold drawing values decreased with irradiation dose and also with the filler content. The data obtained reveal that Hi Sil is more effective as a reinforcing filler, and the prepared blends are suitable for load-bearing applications.

© 2001 Society of Chemical Industry

Keywords: HAF carbon black; Hi Sil; MDPE/EPDM; black filler; radiation vulcanization; rubber–plastic blends; white filler; yielding properties

Document Type: Research Article

DOI: https://doi.org/10.1002/pi.604

Affiliations: *

Publication date: 2001-03-01

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