Polyester is a class of polymers that contain ester fun […]
Polyester is a class of polymers that contain ester functionality in their main chain. As a specific material, the most commonly used type is called polyethylene terephthalate. Polyesters include naturally occurring chemicals, such as in the horny skin of the plant cuticle, as well as the synthesis of polymers such as Polyester DTY by stepwise growth. Natural polyesters and several synthetic polyesters are biodegradable, but most synthetic polyesters are not. This material is widely used in clothes.
Depending on the chemical structure, the polyester may be thermoplastic or thermosetting. There are also polyester resins cured by hardeners; however, the most common polyesters are thermoplastics.
Fabrics or knitted fabrics from polyester threads or yarns are widely used in clothing and household items, from shirts and pants to jackets and hats, sheets, blankets, soft furniture and computer mouse pads. Industrial polyester fibers, yarns and ropes are used for automotive tire reinforcements, conveyor belts, seat belts, coated fabrics and plastic reinforcements with high energy absorption. Polyester fibers are used as cushioning and insulating materials in pillows, quilts and decorative mats. Polyester fabrics have a high degree of resistance to contamination - in fact, the only dye that can be used to change the color of polyester fabrics is the so-called disperse dyes.
Polyester fibers are sometimes spun with natural fibers to produce fabrics with mixed properties. Cotton-polyester blends can be rugged, wrinkled and resistant to tear, reducing shrinkage. Synthetic fibers in polyesters also produce materials with water, wind and environmental resistance as compared to plant derived fibers. Disadvantages of cotton and polyester blends include less air permeability than cotton and capture more moisture when attached to the skin. They are also less resistant to fire and can ignite when melted.
Polyester is also used in the manufacture of bottles, films, canvas, canoe, liquid crystal displays, holograms, filters, capacitors with dielectric film, wire insulation tape and insulating tape. Polyesters are widely used in high quality wood products such as guitars, pianos and car/yacht interiors. Spraying the thixotropic properties of the polyester makes it ideal for use with open wood because they can be quickly filled with wood grain, with a high coating thickness per layer. Cured polyester can be scrubbed and polished to achieve a high gloss, durable surface.
Liquid crystal polyester is the first commercially available liquid crystal polymer. They are used for their mechanical properties and heat resistance. These features are also important in their applications as wear seals in jet engines.