polypropylene

pol·y·pro·pyl·ene

P0429400 (pŏl′ē-prō′pə-lēn′)n.1. Any of various thermoplastic polymers of propylene. They are hard and tough, and are used to make molded articles and fibers.2. A fabric of fibers made from any of these polymers.

pol′y·pro′pyl·ene′ adj.

polypropylene

(ˌpɒlɪˈprəʊpɪˌliːn) n (Elements & Compounds) any of various tough flexible synthetic thermoplastic materials made by polymerizing propylene and used for making moulded articles, laminates, bottles, pipes, and fibres for ropes, bristles, upholstery, and carpets. Systematic name: polypropene

pol•y•pro•pyl•ene

(ˌpɒl iˈproʊ pəˌlin)

n. a plastic polymer of propylene, (C₃H₅)_n, used chiefly for molded parts, electrical insulation, packaging, and fibers for wearing apparel. [1930–35]

Thesaurus

Noun

polypropylene - a polymer of propylene used as a thermoplastic molding materialpolypropeneplastic - generic name for certain synthetic or semisynthetic materials that can be molded or extruded into objects or films or filaments or used for making e.g. coatings and adhesives

Translations

polypropylene

(pŏl'ēprō`pəlēn), plasticplastic,
any organic material with the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn. Composition and Types of Plastic
..... Click the link for more information. noted for its light weight, being less dense than water; it is a polymerpolymer
, chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds (see chemical bond). The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer,
..... Click the link for more information. of propylene. It resists moisture, oils, and solvents. Since its melting point is 121&degC; (250&degF;), it is used in the manufacture of objects that are sterilized in the course of their use. Polypropylene is also used to make textiles, ropes that float, packaging material, and luggage.

Polypropylene

A common flexible plastic usually spun into fiber for rope and woven goods.

Polypropylene

a thermoplastic polymer of propylene, [—CH₂—CH(CH₃)—]_n; a colorlesscrystalline substance of iso-tactic structure. Molecular weight M̅_w, 300,000–700,000; maximum crystallinity, 73–75 percent; density, 0.92–0.93 g/cm³ at 20°C; melting point, 172°C. Polypropylene has high impact strength (impact strength, notched 5–12 kilojoules per sq m, or kilograms-force · cm per sq cm), high resistance to multiple bending, and low vapor and gas permeability; its durability is comparable to that of the polyamides.

Polypropylene is a good dielectric (power factor, 0.0003–0.0005 at 1 megahertz) and a poor heat conductor. It is insoluble in organic solvents and resistant to boiling water and alkalies, but darkens and decomposes under the influence of HNO₃, H₂SO₄, and chromium mixtures. Since polypropylene has low heat and light resistance, special additives called polymer stabilizers are introduced into the mixture.

Polypropylene is produced by solution or bulk polymerization of a monomer. It is processed by injection molding and extrusion. Polypropylene is used to manufacture fibers and films that retain their ductility at 100°-130°C, as well as expanded plastics, machine parts, shaped products, pipes (for aggressive liquids), various fittings, containers, and household goods.

The amorphous phase, in a 3–7 percent quantity formed during polypropylene synthesis, is isolated from the basic crystalline product and used in the manufacture of rubber household goods and additives for lubricating and motor oils. Polypropylene is produced in the USSR, Italy (Moplen), Great Britain (Propa-thene), the Federal Republic of Germany (Hostalen), and the USA (Poly-pro, Pro-fax). The 1973 world production of polypropylene was estimated at 2.4 million tons.

REFERENCES

See references under .

O. N. PIROGOV

polypropylene

[‚päl·ə′prō·pə‚lēn] (organic chemistry) (C₃H₆)_xA crystalline, thermoplastic resin made by the polymerization of propylene, C₃H₆; the product is hard and tough, resists moisture, oils, and solvents, and withstands temperatures up to 170°C; used to make molded articles, fibers, film, rope, printing plates, and toys.

polypropylene

A plastic polymer of propylene; a tough material having good resistance to heat and chemical action.

polypropylene

pol·y·pro·pyl·ene

polypropylene

pol•y•pro•pyl•ene

polypropylene

polypropylene

Polypropylene

Polypropylene

REFERENCES

polypropylene

polypropylene

polypropylene

Synonyms for polypropylene

noun a polymer of propylene used as a thermoplastic molding material

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