Add time:09/04/2019         Source:sciencedirect.com

Publisher SummaryThis chapter outlines polymers containing esters groups in the backbone. Poly(esters) are common polymers used as both thermoplastic materials and as fibers. The polymeric chain contains an acid fragment and an alcohol fragment. Similarly, to polyamides, two series of polyesters are known, one resulting from a hydroxy acid or a lactone and the other resulting from a diacid and a diol (or polyol). A number of polyesters with aliphatic or cycloaliphatic backbone are used in practice. Among these are polylactic acid, poly(hydroxyacetic acid), poly-caprolactone, poly(ethylene glycol succinate), and poly(ethylene glycol adipate). Some of the polymers obtained from aliphatic acids and aliphatic hydroxy components are biodegradable and have various medical applications for surgical sutures and drug delivery systems. Others are used for packaging, films, and stationary phases in chromatography. The polyesters with aromatic groups in the backbone have many practical applications. Among these polymers, poly(ethylene terephthalate) (PET) is probably the best known for its use in fibers for clothing, films, bottles, food containers, and engineering plastics for precision-molded parts. Copolymers of polyesters are of considerable practical interest because clothing and upholstery are frequently made from polyester fibers. In addition, a special group of copolymers is that of polyester thermosets. Thermal decomposition of polyester copolymers is of considerable interest because of their common use in practice.

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