*** Welcome to piglix ***

Dacron

Polyethylene terephthalate
PET.svg
PET polymer chain
A short section of a PET polymer chain
Names
IUPAC name
Poly(ethyl benzene-1,4-dicarboxylate)
Identifiers
25038-59-9 YesY
Abbreviations PET, PETE
ECHA InfoCard 100.121.858
Properties
(C10H8O4)n
Molar mass variable
Density 1.38 g/cm3 (20 °C),amorphous: 1.370 g/cm3,single crystal: 1.455 g/cm3
Melting point > 250 °C, 260 °C
Boiling point > 350 °C (decomposes)
practically insoluble
Thermal conductivity 0.15 to 0.24 W m−1 K−1
1.57–1.58, 1.5750
Thermochemistry
1.0 kJ/(kg·K)
Related compounds
Related Monomers
Terephthalic acid
Ethylene glycol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YesYN ?)
Infobox references

Polyethylene terephthalate (sometimes written poly(ethylene terephthalate)), commonly abbreviated PET, PETE, or the obsolete PETP or PET-P, is the most common thermoplastic polymer resin of the polyester family and is used in fibers for clothing, containers for liquids and foods, thermoforming for manufacturing, and in combination with glass fiber for engineering resins.

It may also be referred to by the brand name Dacron; in Britain, Terylene; or, in Russia and the former Soviet Union, Lavsan.

The majority of the world's PET production is for synthetic fibers (in excess of 60%), with bottle production accounting for about 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 fourth-most-produced polymer; polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC) are first, second and third, 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.

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 micrometers) depending on its crystal structure and particle size.


...
Wikipedia

...