Thermoplastics Polyfbutylene terephthalate

Another possibility for obtaining imide modified thermoplastic polyesters was to use as a monomer the hydroxy acid made from trimellitic anhydride and aminoethanol. Such a poly(ester-imide) was claimed for injection molding [240]. For the same use, poly(ester-imide)s containing aminophenol/trimellitic anhydride [241],imidised polyfbutylene terephthalate) [242] and a wholly aromatic poly(ester-imide) made from trimellitic anhydride, p-aminobenzoic acid, p-acetoxybenzoic acid, diacetoxybiphenyl and terephthalic and isophthalic acids are known, which showing optical anisotropy [243]. 

Thermoplastics can be used as particulate toughening agents. Substances used in this way include polyfbutylene terephthalate), nylon 6 and polyfvinylidine fluoride). Toughness can be i ncreased by a factor of 6 by use of these particulates. 

H. J. Radusch, Polyfbutylene terephthalate), in Handbook of Thermoplastic Polymers Homopolymers, Copolymers, Blends, and Composites (ed. S. Fakirov), Wiley-VCH Verlag GmbH, Weinheim, Germany, Ch. 8, p. 389-419, 2002. 

Q. Shi, P. Stagnaro, C. L. Cai, J. H. Yin, G. Costa and A. Turturro, Thermoplastic elastomers based on compatibilized polyfbutylenes terephthalate) blends effect of functional groups and dynamic curing, /. Appl. Polym. Sci., 110 3963-3972,2008. 

Aliphatic polyesters have crystaUine melting points lower than polyethylene. Polycaprolactone has a melting point of 50 °C. Placing phenyl rings in the backbone increases both and Tg significantly. Poly(ethylene terephthalate) with = 265 C and Tg = 65 °C and polyfbutylene terephthalate) with T = 210 °C and Tg = 35 C are both commercial thermoplastics (Formula 1.8). Closely related to these polymers is poly(bisphenol-A carbonate) (Formula 1.9) with Tg = 150 °C. This polymer usually does not crystallize. 

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