Polyethylene Terephthalate
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Polyethylene terephthalate (sometimes written poly(ethylene terephthalate)), commonly abbreviated PET, PETE, or the obsolete PETP or PET-P, is a thermoplastic polymer resin of the polyester family and is used in synthetic fibers; beverage, food and other liquid containers; thermoforming applications; and engineering resins often in combination with glass fiber. The term polyethylene terephthalate is a source of confusion because this substance, PET, does not contain polyethylene. Thus, the alternate form, poly(ethylene terephthalate), is often used in scholarly journals for the sake of accuracy and clarity. Depending on its processing and thermal history, polyethylene terephthalate may exist both as an amorphous (transparent) and as a semi-crystalline polymer. The semicrystalline material might appear transparent (particle size < 500 nm) or opaque and white (particle size up to a few microns) depending on its crystal structure and particle size. Its monomer (bis-β-hydroxyterephthalate) can be synthesized by the esterification reaction between terephthalic acid and ethylene glycol with water as a byproduct, or by transesterification reaction between ethylene glycol and dimethyl terephthalate with methanol as a byproduct. Polymerization is through a polycondensation reaction of the monomers (done immediately after esterification/transesterification) with water as the byproduct. The majority of the world's PET production is for synthetic fibers (in excess of 60%), with bottle production accounting for around 30% of global demand. In the context of textile applications, PET is referred to by its common name, "polyester," whereas the acronym "PET" is generally used in relation to packaging. Polyester makes up about 18% of world polymer production and is the third-most-produced polymer; polyethylene (PE) and polypropylene (PP) are first and second, respectively. PET consists of polymerized units of the monomer ethylene terephthalate, with repeating C10H8O4 units. PET is commonly recycled, and has the number "1" as its recycling symbol. PET Young's modulus (E) 2800–3100 MPa Tensile strength(σt) 55–75 MPa Elastic limit 50–150% notch test 3.6 kJ/m Glass temperature 75 °C Vicat B 170 °C linear expansion coefficient (α) 7×10/K Water absorption (ASTM) 0.16 SourceFrom Wikipedia under the
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Polyethylene Terephthalate Information (Bottles, Polyester) @ Waxy.us Polyethylene Terephthalate Information. Includes Processing, Polyethylene Terephthalate or Pet, Material, Degradation and Plastic information plus more related topics ... www.waxy.us/polyethylene_terephthalate/encyclopedia.htm Esterification Information (Organic, Acid, Product, Groups) @ Waxy.us ... are produced industrially annually, important products being polyethylene terephthalate ... Waxy.us is designed and maintained by K. Keith Karr and is a part of the ... www.waxy.us/esterification/encyclopedia.htm www.waxy.us http://www.waxy.us/ http://www.waxy.us/%3cbr/ http://www.waxy.us/%c3%8ele-de-br%c3%a9hat/ http://www.waxy.us/%c3%8ele-de-br%c3%a9hat/blogs.htm http://www.waxy.us/-ose/ www.waxy.us/urllist.txt From Bing Site Search: "polyethylene terephthalate" Business: Textiles and Nonwovens: Fibers: Man-made See also: Business: Chemicals: Polymers: Fillers and Additives (49) Business: Textiles and Nonwovens: Textiles: Import and Export (114) This category in other languages: Business: Textiles and Nonwovens: Fibers: Man ... AFM Characterisation of Technical Fibres - Technical paper presenting the methodological approaches to exploring the nanostructures, properties and dynamics of surfaces ... Business: Textiles and Nonwovens: Fibers: Man ... Advan SA - Turkey. Manufacturers of polyester staple fiber and filament for yarn spinning and nonwovens production. Also, resins, intermediates and plastic bottles.
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