Aromatic polyesters, linear

The successful development of polyfethylene terephthalate) fibres such as Dacron and Terylene stimulated extensive research into other polymers containing p-phenylene groups in the main chain. This led to not only the now well-established polycarbonates (see Chapter 20) but also to a wide range of other materials. These include the aromatic polyamides (already considered in Chapter 18), the polyphenylene ethers, the polyphenylene sulphides, the polysulphones and a range of linear aromatic polyesters. 

Table 1.76. Blends with linear, aromatic polyesters, PAr ...

Polyesters. The first synthetic fiber forming polymer produced by Carothers and coworkers was an aliphatic polyester made from trimethylene glycol and a hexadecamethylene dicarboxylic acid. This polymer was low-melting (70°C) and hydrolytically unstable. In 1941, Whinfield and Dickson synthesized the first high-melting symmetrical linear aromatic polyester, polyethylene terephthalate, and found it to be a very useful product. ... 

Linear aromatic polyesters prepared from dlphenols and dibasic acids have been reported In some early patents (1 - ). More recently, Morgan ( ) has synthesized aromatic polyesters by Interfaclal and solution methods from aromatic dlacld chlorides and blsphenols that have essentially planar, doubly attached groups on the methylene units between the phenylene rings. Bier ( ) has recently reviewed polyesters made from aromatic dlcarboxyllc acids and blsphenols and describes the preparation of some blsphenol monomers and polyesters made therefrom by Interfaclal condensation, solution condensation, melt condensation, and re-esterlflcatlon reaction methods. 

CLASS Polyesters linear aromatic polyesters thermoplastics... 

Rigid linear aromatic polyester Rigid-rod polymers... 

General Electric Corporation [86] found that the addition of small amounts of a polybutadiene, with vinyl content over 80% resulted in substantial melt stabilisation of linear aromatic polyesters such as PET. 

Figure 3 summarizes the molecular architecture used to promote polyester melt anisotropy at reasonable temperatures. The Celanese, DuPont and Eastman laboratories have outlined most of the key approaches to lower polymer melting point via crystalline order disruption. This is accomplished while maintaining sufficient molecular symmetry to preserve the melt anisotropy inherent in linear aromatic polyesters, that is, polyesters derived typically from symmetric monomers as p-hydroxybenzoic acid, terephthalic acid, hydroquinone, 4,4 -biphenol and the like. 

Poly(trimethylene terephthalate) (PTT) is a linear aromatic polyester produced by polycondensation of 1,3-propanediol (trimethylene gfycol or PDO) with either purified terephthalic acid (PTA) or trimethyl terephthalate (DMT) (Fig. 2.19). 

Polymers (film, fabrics) of the linear aromatic polyester polypropylene terephthalate... 

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