Para-poly(aryl ether sulfone ether ketone ketones) (p-PESEKKs)

were prepared by low temperature solution polycondensation of 4

4′-bis(phenoxy)diphenyl sulfone (DPODPS) and terephthaloyl chloride (TPC) in AlCl3/DCE/DMF solvent system.The effects of some factors on solvent induced crystallization behavior of p-PESEKKs were investigated and compared.The results showed that p-PESEKKs of low crystallinity were obtained in the AlCl3/DCE/DMF good solvent system

and they became amorphous after fusion because of the influence of tetrahedral cofiguration of sulfuryl.It was found that the solvent induced crystallization rate and degree of crystallinity decreased with increasing the carbon number of ester end groups

and the end groups with the same structure as the main chain were favorable for crystallization.The high molecular weight p-PESEKKs with lower proportion of end groups were easy to be crystallized by solvent inducement.