Abstract
An experimental investigation of the thermal, rheological and mechanical behaviour of polysulphone (PSF) / poly(ethylene terephthalate) (PET) blends having different blend compositions has been conducted. It was shown that the thermorheological and mechanical properties of the blends are associated with their structure and phase morphology. The observed good agreement between the experimental results and the glass transition temperatures calculated from the Fox equation, and the melting temperatures calculated from the Nishi-Wang equation, indicates a partial compatibility and the formation of homogeneous amorphous areas in PSF/PET blends. It was found that an addition of PET (up to 15 wt.%) to PSF results in a significant decrease in the melt viscosity, and a simultaneous improvement in the mechanical properties of PSF; the Young's modulus values of all the compositions are higher than the corresponding values computed from the proportional additivity rule. Thus, the flow and mechanical characteristics of the PSF/PET systems are governed mainly by the phase structure and morphology of the blends.
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