The engineering polymer alloys of syndiotactic polystyrene (sPS)／polyester (PET)／zinc salt of sulfonated syndiotactic polystyrene ionomer (SsPS-Zn) have been prepared and the mechanical properties

misibility

thermal behavior and morphology of alloys were investigated．When sPS/PET/SsPS-Zn=85／15／2 (weight ratio)

the unnotched Izod impact strength of alloy reached maximum value of l0.6 kJ／m2

which was about 2.5 times of the pure sPS

while tensile strength and flexural strength were still higher than that of pure sPS．TMA showed that addition of SsPS-Zn

the alloys had better thermal resistance．Results of DSC showed that the melting temperature of sPS was the same compared with pure sPS．The initial crystallization temperature and the temperature at maximum crystal velocity of sPS were all higher than that of pure sPS and did not change with increasing content of SsPS-Zn. Crystallinity changed downward slightly and crystallizing velocity decreased with increasing content of SsPS-Zn．The melting temperature

the initial crystallization temperature and the temperature at maximum crystallizing velocity of PET decreased with increasing content of SsPS-Zn．DMA showed that all alloys have one glass transition temperature (Tg)．Tg and the half peak width was lowest on addition of 2 parts of SsPS-Zn．The storage modulus at room temperature was highest on addition of 2 parts of SsPS-Zn

too．SEM displayed on addition of 2 parts SsPS-Zn

the dispersion dimension of PET was decreased and more evenly

while on addition of 6 parts SsPS-Zn．it increased．