Copolyester poly

PCTA Copolyester. Poly(l,4-cyclohexanedimethylene terephthalic acid) (PCTA) copolyester is a polymer of cyclohexanedimethanol and terephthalic acid, with another acid substituted for a portion of the terephthalic acid otherwise required. It has the following formula ... 

Y Doi, Y Kanesawa, M Kunioka, T Saito. Biodegradation of microbial copolyesters Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate). Macromolecules 23 26-31, 1990. 

CHDA CHDM DMCD EG IPA N NDA PCT PCTA PCTG PET PETG TMCD TPA cis/trans-1,4-cyclohexanedicarboxylic acid cis/trans-1,4-cyclohexanedimethanol dimethyl cis/trans-1,4-cyclohexanedicarboxylate ethylene glycol isophthalic acid dimethyl 2,6-naphthalenedicarboxylate 2,6-naphthalenedicarboxylic acid poly(1,4-cyclohexylenedimethylene terephthalate) dibasic-acid-modified PCT copolyester glycol-modified PCT copolyester poly(ethylene terephthalate) CHDM-modified PET copolyester c .S / ra .v-2,2,4,4-tetramethyl-l,3-cyclobutancdiol terephthalic acid... 

Arnold [1] prepared the hydrophilic and bioabsorbable copolyester, poly (monostearoyl glycerol-co-succinate) (1), which was used in the sustained release of Risperidone . 

Aliphatic copolyester Poly(butylenesuccinate[Pg.162]

Figure 2.22a reports the DCI mass spectrum of a microbial copolyester, poly()3-hydroxybutyrate-co-15% )3-hydrox5rvalerate)(PFlB/HV). The relative intensities of several series of oligomers in the spectrum, from dimers to hexamers, are compared with theoretical intensities (Figure 2.22b). Each series...

Deng, L.M., Wang, Y.Z., Yang, K.K. et al. (2004) A new biodegradable copolyester poly(butylene succinate-co-ethylene sucdnate-co-ethylene terephthalate). Acta Materialia, 52 (20), 5871-5878. Mochizuki, M., Mukai, K., Yamada, K. et al. (1997) Structural effects upon enzymatic hydrolysis of poly(butylene succinate-co-ethylene succinate)s. Macromolecules, 30 (24), 7403-7407. 

Largely unsaturated PHAs have been cross-linked by a very slow chemical procedure (it usually takes days), which implies the conversion of double bonds into epoxy groups and exposure to air (Ashby et al. 20(X)). Other epoxidized bacterial copolyesters, poly[(/ )-3-hydroxyoctanoate-co-(/ )-3-hydroxy-10,ll-epoxyunde-canoate], were cross-linked with succinic anhydride in the presence of 2-ethyM-methylimidazole or with hexamethylene diamine without a catalyst at 90°C (Lee et al. 1999a Lee and Park 1999). 

Pseudomonas citronellolis was found to produce mcl-PHA on many different substrates (Choi and Yoon 1994). Similar to P. fluorescens, this strain also produced unsaturated monomers from unrelated C -C acids up to 9 mol% 3-hydroxy-c -5-dodecenoate and up to 2.6 mol% 3-hydroxy-CM-7-tetradecenoate, with the largest content being (7 )-3-hydroxydecanoate. A novel copolyester, poly(3-hydroxy-7-methyl-6-octenoate-co-3-hydroxy-5-methylhexanoate), was synthesized when P. citronellolis was grown on citronellol (Choi and Yoon 1994). 

PETG (copolyester) Poly(buthylene terephthalate) Poly(lactlc acid)... 

The development of fumarate-based polyesters for biomedical applications started around 20 years ago. Fumaric acid is a natural metabolite involved in Krebs cycle, and is comprised of a reactive double bond available for chemically crosslinking reactions. These characteristics make fumaric acid a candidate building block for crosslinkable polymers. The first and most comprehensively investigated fumarate-based copolymer is the biodegradable copolyester poly(propylene fumarate) (PPF) (Fig. 6.8). ... 

The next two decades saw the development of new polymers such as thermoplastic PU (1961), aromatic polyamides, polyimides (1962) polyaminimides (1965), thermoplastic elastomers (styrene-butadiene block copolymers in 1965), ethylene-vinyl acetate copolymer, ionomers (1964), polysulfone (1965), phenoxy resins, polyphenylene oxide, thermoplastic elastomers based on copolyesters, poly butyl terephthalate (1971) and polyarylates (1974). 

Kunioka, M., Tamaki, A. and Doi, Y. (1989b) Crystalline and thermal properties of bacterial copolyesters poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and poly(3-hydroxybuty rate-co-4-hydroxybutyTate), Macromolecules, 22, 694 697. 

Aliphatic polyesters and copolyesters Aromatic polyesters and copolyesters Poly(caprolactone) - PCL Poly(esteramide)s - PEA Poly(vinyl alcohol) - PVA... 

Thermal degradation of two types of copolyesters poly(3-hydroxybutyrate-co-3-ltydroxy-valerate) (3HV = 0-71 mol%) and poly(3-liydroxybulyrate-co-4-ltydroxybutyrate) (0-82%), were studied in the temperature range 100-200°C by monitoring the time-dependent changes in molecular weight of melt samples [18]. All copolyester samples were thermal unstable at temperatures above 170°C. 

PLA), polycaprolactone (PCL), aliphatic copolyesteis (poly(butylene succinate), poly(butylene succinate-co-adipate), poly(ethylene succinate)), aliphatic-aromatic copolyesters (poly(butylene adipate-co-terephthalate)), starch-based polymers, polyCvii rl alcohol), cellulose acetate. 

The biodegradation behaviour and mechanism of aliphatic copolyester poly(butylene succinate-co-butylene achpate) (PBSA) by Aspergillus versicolor isolated from compost was... 

Another class of polyesters are based on cycloaliphatic diols. Eastman Chemical has a broad portfolio of copolyesters where the combination of cycloaliphatic diols, ethylene glycol, iso- and terephthalic moieties are varied. Two will be discussed here. The copolyester poly( 1,4-cyclohexylene-dimethylene... 

An extensive investigation on the anaerobic degradability of a number of natural and synthetic polyesters was performed by Abou-Zeid [30]. Beside the poly(hydroxyalkanoates), PHB and PHBV (10 mol% HV) she tested PCL, the aliphatic homopolyester poly(butylene adipate) (SP4/6) and the copolyester poly(butylene adipate-co-butylene terephthalate) where about 40% of the diacid component consists of the aromatic terephthalic acid (BTA 40 60). Weight loss measurements of polymer films (40-74 pm thickness) in two different... 

In 1994, Witt and co-workers [5] first reported a microbial degradation of a block-copolyester [poly(trimethylene decanoate)-block-(trimethylene terephthalate)] with 50 mol% of terephthalic acid in the acid component. In a mineral medimn inoculated with sewage sludge, Witt and co-workers observed a weight loss in polyester films of about 9% within four weeks. In 1995 the same authors published data about the degradation of random aliphatic-aromatic copolyesters from terephthalic acid, 1,3-propanediol and adipic acid or sebacic acid (30 mol% of terephthalic acid content) in a soil burial experiment... 

PCXA Copolyester poly(cyclo-hexane-dimethanol-terephthalate acid) acid... 

As mentioned, previously, a bacterial copolyester (poly(3-hydroxyoctanoate-co-3-hydroxyundecenoate), PHOU) containing repeating units with terminal... 

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