polypropylene

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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the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn.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
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 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,
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 of propylene. It resists moisture, oils, and solvents. Since its melting point is 121°C; (250°F;), 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 M̅w, 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)x A 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.
References in periodicals archive ?
Lin, Y, Hiltner, A, Baer, E, "Nanolayer Enhancement of Biaxially Oriented Polypropylene Film for Increased Gas Barrier.
Biaxially Oriented Polypropylene (BOPP) Films Application in Food Packaging will Drive the Market
De Vries studied the structure and properties of uniaxially and biaxially oriented polypropylene films in three parts (1-3).
7 m wide manufacturing line for biaxially oriented polypropylene (BOPP)
This report analyzes the worldwide markets for Plastic Film and Sheets in Thousands of Tons and US$ Million by the following product segments: Polyethylene Films {High-Density Polyethylene (HDPE) Films, Low-Density Polyethylene (LDPE) Films, & Linear Low-Density Polyethylene (LLDPE) Films)}, Polypropylene Films {Oriented Polypropylene Films (OPP) Films}, Biaxially Oriented Polypropylene (BOPP) Films, & Non-Oriented Propylene (Non-OPP) Films}, Polyvinyl Chloride (PVC) Films, and High Performance Films {Nylon Films, Polyester/Polyethylene Terephthalate (PET) Films, & Other High Performance Films).
Scientex Bhd and Futamura Chemical Co Ltd have inked a strategic alliance agreement to put up a biaxially oriented polypropylene (BOPP) film manufacturing plant plus to develop and grow the consumer packaging markets.
It has vast capacities for production of Polyester chips, Biaxially Oriented Polyethylene Teraphthalate (BOPET) and Biaxially Oriented Polypropylene (BOPP) films, Printing & Coating Inks, facilities for Holography, Metalization & PVDC coating, making Gravure Printing Cylinders, Gravure Printing, Lamination and Pouch formation.
The major product segments analyzed are Polyethylene Films (High-Density Polyethylene (HDPE) Films, Low-Density Polyethylene (LDPE) Films, & Linear Low-Density Polyethylene (LLDPE) Films), Polypropylene Films (Oriented Polypropylene Films (OPP) Films, Biaxially Oriented Polypropylene (BOPP) Films, & Non-Oriented Propylene (Non-OPP) Films), Polyvinyl Chloride (PVC) Films, and High Performance Films (Nylon Films, Polyester/Polyethylene Terephthalate (PET) Films, and Other High Performance Films).
Innovia Films is a major producer of specialty Biaxially Oriented Polypropylene (BOPP) and Cellulose Films holding a leading global position in the markets for labels, high performance coated packaging, tobacco overwrap and biodegradable and compostable films.
plans to select a location by the end of 2002 for a new Biaxially Oriented Polypropylene film production line.
QPF manufactures and sells biaxially oriented polypropylene films and has offices and a production facility in Streamwood, Ill.