For RO-P[O.sub.3.sup.2], the best-suited acid-base pair
should be found out by comparing the [K.sub.sp] of the corresponding phosphate.
where [I.sub.sp] is the acid-base pair interaction parameter, X represents any one of the host polymers and F the FE flow modifier.
iii) Acid-base interaction and FE effectiveness: The inferences, above, of possible corelations between acid-base pair interactions and the effectiveness of FE as a flow modifier warrant further examination.
Therefore, chemists ought to speak of acid-base pairs
. Whenever a proton transferred from one molecule to another, the one that gave up the proton was an acid, the one that accepted it was a base.
where: [Delta][H.sup.AB] is the exothermic enthalpy of the acid-base interaction, N the mole number of the acid-base pairs per unit area at the interface, and f an enthalpy-to-free surface energy conversion factor (near the unity).
N = Mole number of acid-base pairs per unit area at the interface.