Deformation and energy-absorption characteristics of microcellular EPDM rubber

Abstract

ABSTRACT:Compressive stress-strain properties of closed-cell microcellular EPDM rubber vulcanizates with and without a filler were studied with the variation of density. For filler variation studies, silica and carbon black (N330) were used. With a decrease in density, the stress-strain curve for microcellular EPDM behaves differently from that for the solid vulcanizates: The curve rises steeply when cell breakdown occurs. The compressive stress-strain properties are found to depend on the strain rate. The compression set at constant stress increases with decreasing density. The energy-absorption behavior was studied from the compressive stress-strain properties. The efficiency, E, and ideality, I, parameters were also determined as they are useful for the evaluation of closed-cell microcellular rubber as a cushioning and packaging material. These parameters were plotted against stress to find the maximum efficiency and maximum ideality region which will make these materials suitable for cushioning or packaging applications.

Comparative study of silica‐, nanoclay‐ and carbon black‐filled EPDM rubbers

“…Ethylene–propylene–diene terpolymer (EPDM) finds increasing application in automobile sectors due to its good aging properties and high filler‐loading capacity 1. Fillers are incorporated into EPDM rubber matrices mainly to achieve improvement of service properties and in many cases to reduce the material cost.…”

Morphology and physical properties of closed cell microcellular ethylene–octene copolymer: Effect of precipitated silica filler and blowing agent

“…The mechanism of nucleation and bubble growth in elastomers,14 thermoplastics,15 thermoplastic elastomers,16 and microcellular thermoplastics17–19 using blowing agent and supersaturated methods have been the subject of recent research. Recently, morphological and physicomechanical properties of cellular and microcellular rubbers such as hysteresis, damping, cell size, and thermal insulation properties have been reported 20–26. This article reports the processing and compounding technique of producing closed cell microcellular POE, Engage, with uniform cell distribution.…”

Deformation and energy absorption characteristics of microcellular ethylene‐octene copolymer vulcanizates

“…Stupak et d (24) studied the deformation and energy absorption of polymer foams as a function of 2-D indenter and absorber geometries. Deformation and energy absorption behavior of EPDM rubber have also been evaluated (25). Compressive behavior of microcellular polystyrene foams processed in supercritical carbon dioxide was reported by Arora et aL (26) In this paper, we report the compressive stress-strain properties of unfilled, CaCO,, silica, and aluminum silicate filled microcellular ethylene-octene copolymer vulcanizates with respect to variation of blowing agent loading (density) and various strain rates.…”