Abstract
Crystallisation behaviours of poly(butylene terephthalate) (PBT) homopolymer and PBT in PBT/polyarylate (PAr) blend have been studied using FT-i.r. spectrometry. In addition, the phase behaviour of the PBT/PAr blend has been investigated using a dynamic mechanical analyser. Several conformational sensitive bands in PBT were investigated using FT-i.r. spectra. The peak of carbonyl stretch mode in PBT shifted to a lower wavenumber and some of the intensities of methylene rocking modes or bending modes increased as crystallisation of PBT proceeded. PAr reduced the crystallisation rate of PBT in PBT/PAr blend. In dynamic mechanical thermal analysis, PBT and PAr were completely miscible in amorphous state, irrespective of the composition of the blend. Crystallisation-induced amorphous phase separation of PBT/PAr blend was detected. Single T g was observed in all compositions in amorphous state. Different phase separation behaviour was observed in PBT- and PAr-rich blends.
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