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Encyclopedia > Polyolefin

A polyolefin is a polymer produced from a simple olefin, or alkene as a monomer. For example, polyethylene is the polyolefin made from the olefin ethylene. An equivalent term is polyalkene; both terms are mostly archaic, though polyolefin is still used in the petrochemical industry. A synonym for the more widely accepted term, alkene. ... An alkene in organic chemistry is an unsaturated hydrocarbon containing at least one carbon to carbon double bond. ... In chemistry, a monomer (from Greek mono one and meros part) is a small molecule that may become chemically bonded to other monomers to form a polymer. ... Polyethylene or polyethene is a thermoplastic commodity heavily used in consumer products (over 60M tons are produced worldwide every year). ... R-phrases R12, R67 S-phrases S2, S9, S16, S33, S46 Flash point Flammable gas Explosive limits 2. ... A petrochemical is any chemical derived from fossil fuels. ...


A more specific type of olefin is a poly-alpha-olefin (or poly-α-olefin), a polymer made by polymerizing an alpha-olefin. An alpha-olefin (or α-olefin) is an alkene where the carbon-carbon double bond starts at the α-carbon atom, i. e. the double bond is between the #1 and #2 carbons in the molecule. Low molecular weight poly-alpha-olefins are useful as synthetic lubricants. Covalent bonding is a form of chemical bonding characterized by the sharing of one or more pairs of electrons between atoms, in order to produce a mutual attraction, which holds the resultant molecule together. ... A molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ... A lubricant (colloquially, lube, although this usually refers to personal lubricants) is a substance (usually a liquid) introduced between two moving surfaces to reduce the friction and wear between them. ...

1-hexene, an example of an alpha-olefin
1-hexene, an example of an alpha-olefin

  Results from FactBites:
 
Selected synthetic organic fibres (EHC 151, 1993) (15252 words)
Polyolefin fibres are long-chain polymers composed of at least 85% by weight of ethylene, propylene or other olefin units; polyethylene and polypropylene are used commercially.
Approximately 95% of all polyolefin fibres are polypropylene (Ahmed, 1982).
Polyolefin fibres are typically used in textile applications, although gel spun fibres are used for high tensile strength, but low temperature, applications.
Fast coloring of textiles with spundyed polyolefin fibers (597 words)
Polyolefin fibers are characterized by their resistance to moisture and chemicals.
Polyolefin fibers (PP) are the preferred fibers for disposable hygiene products such as baby diapers, feminine care products, medical textiles, because of polypropylene fibers' ability to offer luxurious softness, dry surface, liquid transportation, strength and elongation properties, and because Polyolefin fibers are considered the most environmentally friendly fiber the in the market.
Polyolefin fibers (especially PP) are widely used in active wear and sportswear; socks; thermal underwear; lining fabrics, because of excellent isolation and water and vapor transport properties.
  More results at FactBites »

 
 

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