A series of in situ composites were obtained by melt blending a thermoplastic resin polysulfone(PSF) and four kinds of whollyaromatic thermotropic liquid crystalline polymers which composed of terephthalic acid(TPA)

m phthalic acid(MPA)

p hydroxybenzoic acid (PHB) and a bisphenol monomer.There are four kinds of bisphenol monomers:4

4′ dihydroxy bisphenyl(BP)

4

4′ dihydroxybisphenyl methane(BPM)

bisphenol A (BPA)

4

4′ dihydroxy bisphenylsulfone(BPS)

corresponding liquid crystalline polymers (LCP) were represented by BP-LCP

BPM-LCP

BPA-LCP

BPS-LCP respectively.The morphology

thermal property and mechanical properties of these in-situ composites were studied.The results showed that BP-LCP and BPS-LCP could form fibrous structure in PSF resin

and skin-core effect appeared on their fracture surface.BPM-LCP and BPA-LCP only had spherical shape.The compatibility of these liquid crystalline polymers(LCPs)and PSF was poor.The mechanical properties of PSF were improved by adding these LCPs

especially by adding BP-LCP.