Abstract
The partial alkali metalation of poly(p-hydroxystyrene) (PHS) and poly(p-hydroxystyrene-co-styrene) P(HS-co-S) with alkali metal naphthalene (M-Naph) was carried out to obtain a solution of the metalated polymer. The value for {[OM]/[OH]0}tur was determined as the ratio of pendant metal phenolates (OM; M=Li, Na, and K) to the initial pendant phenols when the titration of a PHS or P(HS-co-S) solution with M-Naph begins to give a turbid solution and/or a polymer precipitation. The value of {[OM]/[OH]0}tur was found to depend on the counter cation (M+); i.e., the solubility of partially-metalated P(HS-co-S) was in the order OK≍ONaO}tur vs. the concentration of P(HS-co-S) was linear and “intrinsic” {[ONa]/[OH]O}tur was found to be 0.70. These results can be interpreted in terms of solubility parameter. The polymer which was once precipitated at a high [OM]/[OH]O ratio became soluble again by hydrolysis with acid or by dilution with a THF solution of PHS or P(HS-co-S).
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