Another use is exemplified by the designer Forrest Jessee who designed and made the “Sleep Suit” with this material, able to support and protect the body in situations of discomfort.
Ethylene vinyl acetate (EVA) is a plastic copolymer of ethylene and vinyl acetate. It is used to make particularly flexible and elastic products.
EVM is formed by the copolymerization of ethylene and vinyl acetate. In principle, it consists of methylene units forming a polymer chain saturated with pendant acetate groups. The presence of a main chain that is completely saturated makes EVA a particularly stable polymer. Degradation generally occurs only at very high temperatures and very slowly.
These polymers are used like normal synthetic rubber, as adhesives or as modifiers for thermoplastic resins, in particular PVC. The main differences between various grades of EVA lie in the vinyl acetate content and polymer viscosity.
Due to the saturated structure, they cannot be attacked by ozone or UV rays. EVA has operating temperatures of up to 175°C.
Urethane rubber can be cross-linked with peroxides, isocyanates and sulfur. Urethane rubber that features cross-linking with peroxide and sulfur is worked using techniques normally employed for other types of synthetic rubber. It can be used either without fillers and with any type of carbon black or mineral filler. It results in strong mechanical characteristics, especially in terms of tensile strength and abrasion resistance. On the other hand, it reacts poorly to heat and shows low resistance to permanent deformation at temperatures higher than room temperature. It has poor resistance to oil, since the operating temperature of the latter produces a hydrolytic effect leading to degradation. Usually this compound is integrated by anti hydrolysis additives instead of antiozonants or antioxidants. It cannot be vulcanized in steam as it results in depolymerisation.
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