title: Novel polymer composites from waste ethylene-propylene-diene-monomer rubber by supercritical CO2 foaming technology.
abstract: In this study, a composite has been prepared by mixing waste rubber, such as ethylene-propylene-diene-monomer and low-density poly ethylene foaming, with supercritical carbon dioxide. In order to optimise the foaming process of the waste ethylene-propylene-diene-monomer-low-density poly ethylene composite, the variations of pressure and temperature on the foamed Microcell formation were studied. As indicated in scanning electron microscope photographs, the most uniform microcellular pattern was found at 200 bar and 100 °C using 30% by weight of waste ethylene-propylene-diene-monomer. Carbon dioxide could not be dissolved uniformly during foaming owing to extensive cross-linking of the waste ethylene-propylene-diene-monomer used for the composite. As a result the presence of un-uniform microcells after foaming were observed in the composite matrix to impart inferior mechanical properties of the composite. This problem was solved with uniform foaming by increasing the cross-link density of low-density poly ethylene using 1.5 parts per hundred dicumyl peroxide that enhances composite tensile and compressive strength up to 57% and 15%, respectively. The composite has the potential to be used as a foaming mat for artificial turf.
authors.affiliation: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, South Korea.
authors.forename: Keuk Min
authors.initials: KM
authors.lastname: Jeong
authors.affiliation: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, South Korea.
authors.forename: Yeo Joo
authors.initials: YJ
authors.lastname: Hong
authors.affiliation: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, South Korea.
authors.forename: Prosenjit
authors.initials: P
authors.lastname: Saha
authors.affiliation: Columbian Chemicals Korea, Jeonam, South Korea.
authors.forename: Seong Ho
authors.initials: SH
authors.lastname: Park
authors.affiliation: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, South Korea rubber@gnu.ac.kr.
authors.forename: Jin Kuk
authors.initials: JK
authors.lastname: Kim
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D020724:Elastomers / Q000737:chemistry*; D005030:Ethylenes / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011108:Polymers / Q000737:chemistry*; D059027:Recycling / Q000379:methods*; D062611:Solid Waste
chemical_list: D020724:Elastomers; D005030:Ethylenes; D011108:Polymers; D062611:Solid Waste; C505585:ethylene-propylene-diene-monomer; D002245:Carbon Dioxide
keywords: Foam; composite; cross-linking; recycling; waste ethylene-propylene-diene-monomer