polyolefins


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polyolefins

(pŏl'ēōl`əfən), group of plasticsplastic,
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the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn.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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 that are polymerspolymer
, 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 various alkenesalkene
, any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon double bonds (see chemical bond). Alkenes with only one double bond have the general formula CnH2n.
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, or olefins. The most important are polyethylenepolyethylene
, widely used plastic. It is a polymer of ethylene, CH2=CH2, having the formula (-CH2-CH2-)n, and is produced at high pressures and temperatures in the presence of any one of several catalysts, depending
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 and polypropylenepolypropylene
, plastic noted for its light weight, being less dense than water; it is a polymer 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
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.
References in periodicals archive ?
Key Topics Covered: 1 Introduction 2 Executive Summary 3 Premium Insights 4 Market Overview 5 Polyethylene Market 6 Polypropylene Market 7 Ethylene Vinyl Acetate Market 8 Green Polyolefins 9 Ethylene-Propylene Elastomers Market ) 10 Competitive Landscape 11 Company Profiles
Abstracts are invited on any topic involving polyolefins or flexible packaging, with the following topics being of particular interest: Polyolefins in durable applications; reinforced polyolefins and nanotechnology; catalyst and process advances; applications of polyolefins; high performance polyolefins; packaging sustainability and regulatory issues; new packaging advances--materials, structures; packaging sustainability--end of life issues; polyolefin modifications and chemistry; polyolefin stabilization advances; polyolefin testing and characterization; specialty applications of polyolefins; polyolefins in non-woven fibers; and processing of polyolefins.
Concentrates, powders, and pastes for vinyls, polyolefins, acrylics, and other thermoplastic compounds.
All these methods require dissolution of the polymer in a solvent, for polyolefins this usually means using aggressive solvents at elevated temperature.
The slowdown in manufacturing activities due to the eurozone debt crisis and tight credit policies in China were the main reasons that the growth of the olefins and polyolefins markets was lower than expected in 2011.
The polyolefins market is emerging in various countries like China, South Korea, India, Saudi Arabia, Brazil, etc due to increasing industrial activity.
Sessions will cover polyolefin innovations, new applications, reinforced polyolefins, catalyst and process advances, testing and characterization, and additives/modifiers, as well as new topics such as medical applications, rigid packaging, and advances in film and fiber.
Melapur melamine-based flame-retardant line includes solid melamine cyanurate and melamine polyphosphate products for use in nylon 6 and 66, polyolefins, epoxy, polyurethane, and unsaturated polyester.
Borealis will now renew its focus on developing its operations in Iberia where it is reportedly the largest polyolefins supplier.
The global polyolefins market is currently experiencing a very rough period.
Experts from industry and academia will gather for the 2013 SPE International Polyolefins Conference from Feb.
The South Texas Section of the Society of Plastics Engineers (SPE), in partnership with the Polymer Materials and Additives Division of SPE and the Thermoplastic Materials and Foams Division of SPE, is sponsoring the International Polyolefins Conference 2007, to be held February 25-28 at the Wyndham Greenspoint Hotel in Houston, TX.