EPDMにおける脱硫反応メカニズム [in Japanese] CONTINUOUS DEVULCANIZATION BY SHEAR FLOW STAGE REACTION CONTROL TECHNOLOGY FOR RUBBER RECYCLING, PART 4 DEVULCANIZATION MECHANISM FOR EPDM [in Japanese]
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Mechanism of devulcanization by shear flow stage reaction control technology for sulfur vulcanized EPDM rubber has been studied based on network structure of devulcanized rubber and behavior of crosslinking bond breakage. Sulfur crosslinking bonds of vulcanized rubber are broken selectively during the devulcanization reaction. There are three types of crosslinking bonds such as monosulfide, disulfide and polysulfide bond. At the initial stage of reaction, polysulfide and disulfide bonds are changed to monosulfide bond by heat. Furthermore, monosulfide bond is broken by addition of shear stress and devulcanized rubber is obtained finally. Residual sulfur atom at the broken crosslinking bonds are stabilized by reaction of adjacent hydrogen atom and change into less reactive sulfur functional groups.
GOMU 72(5), 283-287, 1999-05-15
THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN