Effects of blend ratio, crosslinking systems and fillers on the morphology, curing behavior, mechanical properties, and failure mode of acrylonitrilebutadiene rubber and poly(ethylene-co-vinyl acetate) blends
H. Varghese et al., Effects of blend ratio, crosslinking systems and fillers on the morphology, curing behavior, mechanical properties, and failure mode of acrylonitrilebutadiene rubber and poly(ethylene-co-vinyl acetate) blends, J APPL POLY, 71(14), 1999, pp. 2335-2364
Blends of acrylonitrile butadiene rubber (NBR) and poly(ethylene-co-vinyl a
cetate) (EVA), with varying proportions of the components, were vulcanized
using different crosslinking systems, namely, sulfur (S), dicumyl peroxide
(DCP), and a mixed system (S + DCP). Mechanical properties, such as stress-
strain behavior, tensile strength, elongation at break, Young's modulus, te
nsile set, and tear strength, were studied. The mixed system exhibited bett
er mechanical performance than other systems. The tensile and tear fracture
surfaces were analyzed under the scanning electron microscope in order to
understand the failure mechanism. The variation in properties was correlate
d with the morphology of the system. The effect of high-abrasion furnace bl
ack (HAF), semireinforcing furnace black (SRF), silica, and clay on the mec
hanical properties and failure mechanism of 50/50 blend of NBR-EVA (N50P) h
as also been studied. The Kraus equation has been applied to analyze the ex
tent of polymer-filler interaction. Applicability of various theoretical mo
dels has been investigated to predict the properties of the blend systems.
(C) 1999 John Wiley & Sons, Inc.