Miscibility Studies of Poly(styrene-co-4-vinylbenzenephosphonic acid diethyl ester) with Poly(p-vinylphenol)

The miscibility of styrene copolymers of 4-vinylbenzenephosphonic acid diethyl ester (PSVBDEP) with poly(p-vinylphenol) (PVPh) was studied by using DSC, FTIR, 31 P NMR, and 13 C NMR. Results indicated that the copolymer containing 4.3 mol % VBDEP units was immiscible with PVPh. For the PSVBDEP-7.5/PVPh blends, a single T g was observed when the content of PSVDEP-7.5 was at least 60wt %. Mixing of PSVDEP-13.3 with PVPh caused mutual precipitation in tetrahydrofuran. The complexes exhibited a single T g . Three hydrogen bond donors, hexafluoroisopropyl alcohol, phenol, and tert-butyl alcohol, were used to «calibrate» the strength of the -C 6 H 4 P(O)(OC 2 H 5 ) 3 group as an acceptor, and the characteristic parameter in the enthalpy-frequency shift relationship was determined