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Effect of some curatives on the properties of ethylene propylene diene rubber/polyethylene blends
Author(s) -
AbdelBary E M,
von Soden W,
Pechhold W
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199909)48:9<855::aid-pi231>3.0.co;2-e
Subject(s) - vulcanization , materials science , composite material , polyethylene , organic peroxide , natural rubber , epdm rubber , ultimate tensile strength , peroxide , ethylene propylene rubber , modulus , polymer , chemistry , organic chemistry , copolymer
A series of ethylene propylene diene rubber/polyethylene (EPDM/PE) blends has been prepared containing different weight fractions of PE up to 0.66. The blends were vulcanized with a sulphur system N ‐cyclohexyl‐2‐benzthiazol sulphenamide/sulphur (CBS/S), and a non‐sulphur‐system dicumyl peroxide (DCUP). The concentration of the latter has been changed from 1.5 phr up to 6 phr calculated on the total weight of the blend composition. It has been found that the maximum torque obtained from rheographs for blends vulcanized with the CBS/S system decreases markedly with increasing PE concentration in comparison with those vulcanized with peroxide. The E modulus obtained from the stress–strain diagram at 110 °C showed the role played by the crosslinking of PE, the E modulus for blends vulcanized by peroxide being higher than for samples vulcanized with CBS/S. In contrast, the values of E modulus of both samples are practically the same at room temperature and attain more than 40 MPa depending on the composition. The tensile strength at room temperature strongly increases with increasing the weight fraction of PE. It has also been confirmed that the melting point of the crystalline phase of PE decreases with increasing crosslinking density of PE. The shear modulus obtained from dynamic mechanical measurements is in accordance with that obtained from static mechanical measurements. © 1999 Society of Chemical Industry