Highlights ► Some PCDPS congeners were synthesized and the logKow and logk′ were determined. ► Three methods were used to establish models for predicting logKow and logk′. ► The logKow and logk′ of all PCDPS congeners were predicted based on the models. ► The electrostatic effect may be the primary factor influencing logKow and logk′. ► The logKow differences between PCDPS and PCDE, PBDE relate to the molecule size.