Mechanical and aging properties of cross‐linked ethylene propylene diene rubber / styrene butadiene rubber blends

Abstract

ABSTRACT:The mechanical properties and aging characteristics of blends of ethylene propylene diene monomer (EPDM) rubber and styrene butadiene rubber (SBR) were investigated with special reference to the effect of blend ratio and cross-linking systems. Among the blends, the one with 80/20 EPDM/SBR has been found to exhibit the highest tensile, tear, and abrasion properties at ambient temperature. The observed changes in the mechanical properties of the blends have been correlated with the phase morphology, as attested by scanning electron micrographs (SEMs). The effects of three different cure systems, namely, sulfur (S), dicumyl peroxide (DCP), and a mixed system consisting of sulfur and peroxide (mixed) on the blend properties also were studied. The stress-strain behavior, tensile strength, elongation at break, and tear strength of the blends were found to be better for the mixed system. The influence of fillers such as high-abrasion furnace (HAF) black, generalpurpose furnace (GPF) black, silica, and clay on the mechanical properties of 90/10 EPDM/SBR blend was examined. The ozone and water aging studies also were conducted on the sulfur cured blends, to supplement the results from the mechanical properties investigation.

Improving thermal and ozone stability of skim natural rubber by diimide reduction

“…8a). The possible reaction mechanism during ozonolysis of NR involves the formation of an intermediate carbonyl oxide which then further reacts to produce primary and secondary ozonides and various peroxidic species resulting in the scission products [30]. For the increase in the HSNR content ( Fig.…”

Assessment of mechanical properties of fluoroelastomer and EPDM in a simulated PEM fuel cell environment by microindentation test

“…In open literatures, there are many reports discussing both thermal and irradiative degradation of EPDM and Fluoroelastomer elastomeric materials [5][6][7][8][9][10], as well as chemical degradation [11][12][13][14][15][16]. On the other hand, only a few studies [17][18][19] focused on the degradation of the mechanical properties of these elastomeric materials. For Fluoroelastomer and EPDM specifically, there is no study, to the authors' knowledge, concerning the mechanical property degradation in PEM fuel cell environment.…”

Ageing studies of ethylene propylene diene monomer rubber/styrene butadiene rubber blends: Effects of heat, ozone, gamma radiation, and water

“…27 The vulcanization of the blends was carried out on a hydraulic press (platen size 8 0 3 8 0 ) under a pressure of 1500 psi at a temperature of 1608C.…”