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Polyvinyl alcohol (PVOH, PVA, or PVAl) is a water-soluble synthetic polymer. ... The safety of polyvinyl alcohol is based on some of the following observations: [17]
Vinyl alcohol, also called ethenol (IUPAC name; not ethanol) or ethylenol, is the simplest enol. With the formula C H 2 CH O H , it is a labile compound that converts to acetaldehyde immediately upon isolation near room temperature. [ 1 ]
Ethylene vinyl alcohol (EVOH) is a formal copolymer of ethylene and vinyl alcohol. Because the latter monomer mainly exists as its tautomer acetaldehyde , the copolymer is prepared by polymerization of ethylene and vinyl acetate to give the ethylene vinyl acetate (EVA) copolymer followed by hydrolysis.
Vinyl acetate is the acetate ester of vinyl alcohol. Since vinyl alcohol is highly unstable (with respect to acetaldehyde), the preparation of vinyl acetate is more complex than the synthesis of other acetate esters. The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst. [6]
Polyvinyl butyral (or PVB) is a resin mostly used for applications that require strong binding, optical clarity, adhesion to many surfaces, toughness and flexibility. It is prepared from polyvinyl alcohol by reaction with butyraldehyde. The major application is laminated safety glass for automobile windshields. [1]
Research suggests that oxidative stress, which is caused by factors including sunlight, alcohol, and certain medications, plays a role in aging and the development of neurodegenerative diseases.
HOUSTON (AP) — Winter weather brings various hazards that people have to contend with to keep warm and safe. These dangers can include carbon monoxide poisoning, hypothermia and frozen pipes ...
Over the past four years, the Trump administration has destroyed or distorted vast swaths of information vital to public life and safety. This is an account of the damage.