Polimery 2008, No 3, 224
The conditions of synthesis of block copoly(oxyethylene-b-ethylene terephthalate)s (PEG-b-PET) with good optical parameters and designed for the production of hydrophilic fibers are presented. For polycondensation the catalysts: antimony trioxide (Sb2O3) and titanium tetraisopropoxide [Ti(OiPr)4] were used. The best optical properties of the polymers were achieved by using the mixture of Sb2O3/Ti(OiPr)4 catalysts. The system which thermally stabilize the PEG-b-PET copolymers was selected. It was stated that the melting temperature (Tm) of the copolymer was insignificantly lower than that of the PET homopolymer (ΔT=11K) when the content of PEG 4000 comonomer amounts 30 wt. %. When the weight fraction of PEG 4000 in the copolymer does not exceed 20 wt. % a cold crystallization is observed.
Key words: poly(ether-b-ester), poly(ethylene terephthalate), stabilization, thermo-oxidative degradation
Fibre-grade copoly(oxyethylene-b-ethylene terephthalate)s with improved optical properties