Abstract: Maleic anhydride-grafted polysulfone(PSF-g-MAH) was prepared. Compared to polysulfone, the surface tension anDIts polar fraction of PSF-g-MAHwere increased by modification. The PSF-g-MAHwas used to compatibilize polysulfone(PSF)/liquid crystalline polymer(LCP) blends. The processabilities and the interfacial properties of PSF/LCPblends before and after compatilization were investigated. It was found that the melt viscosities were increased by the addition of PSF-g-MAH. DRS-FTIRinvestigations showed that the speciaLInteraction between PSFand LCPphases was increased due to the incorporation of PSF-g-MAH. The XPSand PLMstudies revealed that some chemical reactions had occurred between mPSFand LCPphases, which produced PSF-VBcopolymers. It is suggested that the compatibility is attributed to some interactions including both chemical and physical ones. Amodel to illustrate the compatibilization of mPSFin PSF/VBblends has been proposed.

Key words: Maleic anhydride grafted polysulfone, Liquid crystalline polymer, Blends, Interfacial compatibilization