Novel aromatic copolyesters

As the result of performed activities, the oligomers of various chemical compositions have been s mthesized oligosulfones, oligoketones, oligo-sulfoneketones, oligoformals, and novel aromatic copolyesters and block-copolyesters have been produced. 

Solaiman DK, Ashby RD (2005) Rapid genetic characterization of poly(hydroxyalkanoate) synthase and its applications. Biomacromolecules 6 532-537 Song JJ, Yoon SC (1996) Biosynthesis of novel aromatic copolyesters from insoluble 11-phenoxyundecanoic acid by Pseudomonas putida BMOl. Appl Environ Microbiol 62 536-544 Steinbiichel A (2001) Perspectives for biotechnological production and utilisation of biopolymers metabohc engineering of poly-hydroxyalkanoate biosynthesis pathways as a successful example. Macromol Biosci 1 1-24... 

Song, J. J., Yoon, S. C. Biosynthesis of novel aromatic copolyesters from insoluble 11-phenoxyundecanoic acid by Pseudomonas putida BMOl. Appl Environ Microbiol 1996,62, 536-544. 

Frich Dan., Goranov Konstantin, Schneggenburger Lizabeth, Economy James. (1996). Novel High-Temperature Aromatic Copolyester Thermosets Synthesis, Characterization, and Physical Properties Macromolecules, 29(24), 7734-7739. 

Copolyester Synthesis. Copolycondensation has attracted considerable interest as a method of producing polymers with novel properties." In a series of studies the kinetics of the sequence distribution formation during the preparation of fully aromatic copolyesters were examined using p.m.r. spectroscopy and lanthanide-shift reagents." The calculated values of degrees of randomness confirmed the theory that the copolyesters obtained at the isokinetic temperature (200 °C) had a random distribution of comonomer units. Above and below this temperature there was a tendency for block copolymers to form. 

While the biological susceptibility of maity aliphatic polyesters has been known for maiy years, aromatic polyesters such as polyetltylene terephthalate (PET) or polybutylene tereph-thalate are regarded as non-biodegradable [39]. To improve the use properties of aliphatic polyesters, an attempt was made to combine the biodegradability of aliphatic polyesters with the good material performance of aromatic polyesters in novel aliphatic-aromatic copolyesters. 

Furthermore, novel polyfpropylene terephthalate-co-adipate) random copolymers showed that they can be degraded via hydrolysis, especially in the presence of enzymes (Rhizopus delemar and Pseudomonas cepacia lipases), even for a terephthalate content as high as 66 mol% [38]. In contrast to hydrolysis rates, mechanical properties increased upon increasing the terephthalate content. The main advantage of aliphatic-aromatic copolyesters over pure terephthalates is their biodegradability. 

Since the discovery of 1,3- and 1,4-cyclohexanedimethanol, the interest in these monomers for the production of polyesters has gradually increased. Today they are frequently used for the synthesis of both aliphatic and aromatic polyesters and copolyesters, which distinguish by showing novel improved properties. 

The mechanical properties of the UPR prepared using pentaerythritol diacetate were comparable with the properties of a commercial UP resin (Table 10). Novel unsaturatedpara-linked aromatic polyesters and copolyesters (Scheme 11) containing fumaroyl units were synthesized by the interfacial... 

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