Abstract
Miscibility between poly(ethylene terephthalate- co-ethylene naphthalate) (PTN) and poly(ether imide) (PEI) was investigated by the cloud point method with the aid of time-resolved light scattering analysis on crystallization and liquid-liquid phase separation. The system was found to exhibit upper critical solution temperature ( UCST) type phase behaviour. The higher the ethylene naphthalate (N) content in PTN, the lower the UCST and the wider the single-phase region in the phase diagram. From the phase diagrams, the temperature dependence of the binary interaction parameters χ i/ j between constituent monomeric units ( i,j = N, T and EI; T and EI being ethylene terephthalate and ether imide, respectively was estimated. χ T/ N was a positive but small quantity while χ N/ EI was negative, suggesting that the miscibility between PTN and PEI is mostly caused by an exothermic intermolecular interaction between N and EI units and that the repulsive intramolecular interaction between T and N in the copolymer plays a minor role. Based on the temperature dependence of χ i/ j , a miscibility map (temperature-copolymer composition phase diagram) was established.
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