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EPDM gaskets; new materials and procedures for segments and other application in tunneling
Published in Daniele Peila, Giulia Viggiani, Tarcisio Celestino, Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art, 2019
M. Bringiotti, D. Nicastro, F. Garate, S. Villoslada, K. Pini
EPDM rubber (ethylene propylene diene monomer rubber), a type of synthetic rubber, is an elastomer characterized by a wide range of applications. This is an M-Class rubber where the ‘M’ in M-Class refers to its classification in ASTM standard D-1418; the M class includes rubbers having a saturated chain of the polyethylene type. Dienes used in the manufacture of EPDM rubbers are dicyclopentadiene (DCPD), ethylidene norbornene (ENB), and vinyl norbornene (VNB). EPDM rubber is closely related to ethylene propylene rubber: ethylene propylene rubber is a copolymer of ethylene and propylene, whereas EPDM rubber is a terpolymer of ethylene, propylene and a diene-component (Figure 2).
Monomers, Polymers, and Plastics
Published in James G. Speight, Handbook of Petrochemical Processes, 2019
Ethylene-propylene rubber (EPR) is a stereoregular copolymer of ethylene and propylene. Elastomers of this type do not possess the double bonds necessary for cross-linking. A third monomer, usually a mono-conjugated diene, is used to provide the residual double bonds needed for cross-linking. The 1,4-hexadiene and ethylidene norbornene are examples of these dienes. The main polymer chain is completely saturated while the unsaturated part is pending from the main chain. The product elastomer, termed ethylene-propylene terepolymer, can be cross-linked using sulfur. Cross-linking ethylene-propylene rubber is also possible without using a third component (a diene). This can be done with peroxides.
Elastomeric Polymers
Published in Kathleen Hess-Kosa, Building Materials, 2017
The ethylene monomer is flammable but not toxic, and the polypropylene is inert. The most commonly used diene components in the manufacture of EPDM are 1,4-hexadiene, dicyclopentadiene, and ethylidene norbornene. Although not regulated by OSHA, the dienes may cause eye, skin, and respiratory tract irritation. According to NIOSH, dicyclopentadiene may cause irritation to eyes, skin, nose, throat; incoordination, headache; sneezing, cough; and skin blisters. Dienes are crystalline solids and have a “disagreeable camphor-like odor.” As a low level component in rubber, diene emissions are unlikely from EPDM rubber.
The dependence of rubber tackiness on separation speed
Published in The Journal of Adhesion, 2023
The EPDM rubber was purchased from Jilin Petrochemical Company under the trade name EPDM-4045. This polymer contains 53.4% randomized ethylene, 38.9% propylene and 7.7% ethylidene norbornene (ENB) monomers according to the manufacture’s report. The Mooney viscosity of this polymer is 47 at 100°C. The glass transition temperature of this polymer is −51°C. The molecular weight Mw of this EPDM is 132 kg/mol and the polydispersity Mw/Mn of this polymer is 1.87.