Poly-substituent-parameter equation

This equation is an elaboration of the dual substituent-parameter (DSP) equation. Its development has been relatively recent, but Taft and Topsom, who have been closely associated with it, have already written a long review article151 involving the equation, and this article will probably acquire the status in respect of the PSP equation that the article of Ehrenson, Brownlee and Taft92 has in connection with the DSP equation. The name Poly Substituent-Parameter Equation was devised by the present author in a short... 

We have examined the correlation of binding constants for 4-substltuted phenols with five abiotic polymers using an equation based on Inteinnoleoular forces and sterlc effects which will be described later in the section on transport parameters. In the case of poly(ethylene glycol) a borderline dependence on Vg was observed (12). The substituent was considered to have the form ZW where Z is the atom bonded to the ring. 

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