Polyesters

thumb|Ester group (blue) which defines polyesters. This diagram shows just one ester linkage per repeat unit. Polyester is a category of polymers that contain one or two ester linkages in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include some naturally occurring chemicals, such as those found in plants and insects. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not. Synthetic polyesters are used extensively in clothing.

type of polyester commonly used for bottles and clothing

polymer

thumb|Scheme of biosynthesis of cutin and lignin

thumb|PCL beads, as sold for industrial or hobbyist use. Polycaprolactone (PCL) is a synthetic, semi-crystalline, biodegradable polyester with a melting point of about 60 °C and a glass transition temperature of about −60 °C. The most common use of polycaprolactone is in the production of speciality polyurethanes. Polycaprolactones impart good resistance to water, oil, solvent and chlorine to the polyurethane produced.

polymer

thumb|right|200px|Structure of poly-(R)-3-hydroxybutyrate (Polyhydroxybutyrate|P3HB), a polyhydroxyalkanoate thumb|400px|right|Chemical structures of P3HB, PHV and their copolymer PHBV

An alkyd is a polyester resin modified by the addition of fatty acids and other components. Alkyds are derived from polyols and organic acids including dicarboxylic acids or carboxylic acid anhydride and triglyceride oils. The term alkyd is a modification of the original name "alcid", reflecting the fact that they are derived from alcohol and organic acids. The inclusion of a fatty acid confers a tendency to form flexible coatings. Alkyds are used in paints, varnishes and in moulds for casting. They are the dominant resin or binder in most commercial oil-based coatings. Approximately 200,000 t

Polyglycolide or poly(glycolic acid) (PGA), also spelled as polyglycolic acid, is a biodegradable, thermoplastic polymer and the simplest linear, aliphatic polyester. It can be prepared starting from glycolic acid by means of polycondensation or ring-opening polymerization. PGA has been known since 1954 as a tough fiber-forming polymer. Owing to its hydrolytic instability, however, its use was slow to develop. Polyglycolide and its copolymers (poly(lactic-co-glycolic acid) with lactic acid, poly(glycolide-co-caprolactone) with ε-caprolactone and poly (glycolide-co-trimethylene carbonate) with

thumb|right|200px|Structure of poly-(R)-3-hydroxybutyrate (P3HB), a polyhydroxyalkanoate

chemical compound

thumb|right|Metallised film|Metallized boPET film, 32 layers of ~14 μm thickness each

thumb|Structure of poly(lactic-co-glycolic acid). x= number of units of lactic acid; y= number of units of [[glycolic acid.]] PLGA, PLG, or 'poly(lactic-co-glycolic) acid' (CAS: ) is a copolymer which is used in a host of Food and Drug Administration (FDA) approved therapeutic devices, owing to its biodegradability and biocompatibility. PLGA is synthesized by means of ring-opening co-polymerization of two different monomers: glycolide and lactide, the cyclic dimers (1,4-dioxane-2,5-diones) of glycolic acid and lactic acid, respectively. Polymers can be synthesized as either random or block cop

Vectran is a manufactured fiber, spun from a liquid-crystal polymer (LCP) created by Celanese Corporation and now manufactured by Kuraray. Chemically it is an aromatic polyester produced by the polycondensation of 4-hydroxybenzoic acid and 6-hydroxynaphthalene-2-carboxylic acid.

chemical compound

Crimplene is a texturised continuous fibre launched in 1959, produced by modifying Terylene. The patent was taken out by Mario Nava of Chesline and Crepes Ltd of Macclesfield, and sold to ICI Fibres. ICI licensed the product to various throwsters. The largest producer was William Tatton of Leek, and the Golborne factory was at one time capable of taking the entire output of ICI's Wilton production of Terylene.

poly(p-dioxanone) structure|thumb|right Polydioxanone (PDO, PDS) or 'poly-p-dioxanone' is a colorless, crystalline, biodegradable synthetic polymer.

polymer

polymer

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