Miscibility studies of phosphorus-containing polymer blends

The miscibility of the blends of phosphorus-containing polymers with various counter polymers was studied. The miscibility of styrene copolymers containing 4-vinyl- benzenephosphonic acid diethyl ester (VBDEP) moieties with poly(p-vinylphenol) (PVPh) was studied by using DSC, FTIR, {dollar}sp{lcub}31{rcub}{lcub}rm P{rcub}{dollar} and {dollar}sp{lcub}13{rcub}{lcub}rm C{rcub}{dollar} NMR. The copolymer, PSVBDEP-4.3, containing 4.3 mol% VBDEP units was immiscible with PVPh. For PSVBDEP-7.5/PVPh blends, a single T{dollar}sb{lcub}rm g{rcub}{dollar} was observed only when PSVBDEP-7.5 content was at least 60 wt%. Mixing of PSVBDEP-13.3 with PVPh caused mutual precipitation in tetrahydrofuran. The complexes exhibited a single T{dollar}sb{lcub}rm g{rcub}.{dollar} The hydrogen bond donors, hexafluoroisopropanol, phenol and t-butanol, were used to "calibrate" the strength of the -C{dollar}sb6{dollar}H{dollar}sb4{dollar}P(O)(OCH{dollar}sb2{dollar}CH{dollar}sb3{dollar}){dollar}sb2{dollar} group as an acceptor and the characteristic parameter in the enthalpy-frequency shift relationship was determined. Evidence for hydrogen bonding interaction between the phenol and phosphonate groups was obtained from IR, {dollar}sp{lcub}31{rcub}{dollar}P and {dollar}sp{lcub}13{rcub}{dollar}C NMR measurements.; The styrene copolymers, PSVBPA, containing 4.3, 7.5 and 13.3 mol% 4-vinyl-benzenephosphonic acid (VBPA) units were prepared. The IR spectra of the copolymers showed that the difference between the "free" OH and the self-associated OH absorptions was {dollar}sim{dollar}450-{dollar}sim{dollar}650 cm{dollar}sp{lcub}-1{rcub}.{dollar}; The blends of the styrene copolymers, PSVBPA-4.3, PSVBPA-7.5 and PSVBPA-13.3, with poly-(n-butyl methacrylate) (PBMA), and the blends of PSVBPA-13.3 with poly(vinyl methyl ether) (PVME) and PSVBDEP-13.3 were studied in terms of miscibility by using DSC. All three copolymers were immiscible with PBMA. IR spectra indicated no observable interactions between the phosphonic acid and -C=O groups in PSVBPA-13.3/PBMA blends. The blends of PSVBPA-13.3/PVME were immiscible. However, the blend containing 50 wt% PSVBPA-13.3 and 50 wt% PSVBDEP-13.3% appeared to be miscible.; The miscibility of the blends of the styrene copolymers, PSDMVP, containing 4.7, 10.2 and 15.9 mol% dimethyl vinylphosphonate units with PVPh was also studied by DSC. Both PSDMVP-4.7 and PSDMVP-10.2 were immiscible with PBMA. However, the blends of PSDMVP-15.9 with PVPh appeared to be partially miscible.; The results of DSC measurements indicated that the blends of the styrene copolymers containing 4.7, 10.2 and 15.9 mol% vinylphosphonic acid units with PBMA were immiscible.