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Abstract  

A calorimetric study of blends of poly(ethylene terephthalate-co-p-oxybenzoate), PET/PHB, with poly(butylene terephthalate), PBT has been carried out in the form of as-spun and drawn fibres. DSC melting and crystallization results show that PBT is compatible with LCP and the crystallization of PBT decreases by the addition of LCP in the matrix. The crystallization behaviour of blend fibres is investigated as a function of temperature of crystallization. A detailed analysis of the crystallization course has been made utilizing the Avrami expression. The isothermal calorimetric measurements provide evidence of decrease of rate of crystallization of PBT on addition of the liquid crystalline component up to about 50% by weight. The values of the Avrami exponents change in the temperature range from 200° to 215°C. Dimensionality changes in crystallization could be due to LCP mesophase-transition.

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Eng Sci . 1987 ; 27 6 410 – 423 10.1002/pen.760270606 . 8. Blizard , KG , Baird , DG . The morphology and rheology of polymer blends containing a liquid crystalline copolyester

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polypropylene on a blend of polyamide-6 and liquid crystalline copolyester . Polym Int 1997 42 : 209 – 217 10.1002/(SICI)1097-0126(199702)42:2<209::AID-PI700>3.0.CO;2-P . 38. Hirose , M

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composites containing potassium titanate whisker and liquid crystalline copolyester . Polymer 40 : 1109 – 1117 10.1016/S0032-3861(98)00340-1 . 3. Countney , TH 1990

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