Nuclear magnetic resonance studies of ionomers. 5. Spectra of poly (methyl methacrylate-co-4-vinyl pyridine), poly (methyl methacrylate-co-2-methyl-5-vinyl pyridine), and their quaternized derivatives

Abstract

ALMERIA NATANSOHN and ADI EISENBERG. Can. J. Chem. 65, 1873Chem. 65, (1987. Proton and carbon nuclear magnetic resonance spectra in solution of poly(methy1 methacrylate-co-4-vinyl pyridine), poly-(methyl methacrylate-co-2-methyl-5-vinyl pyridine), and of their derivatives obtained by quaternization with methyl iodide are presented. The vinyl pyridine structural units content of the samples is ca. 10%. In different solvents, the spectra provide information about the sequence distribution and configuration of the copolymers. A "coisotactic" alternating addition, defined as the probability of finding a methoxy group and a pyridine ring neighboring each other on the same side of the main chain, can be estimated as about 0.5 in both cases. This information arises from the splitting of the aromatic and of the methoxy signals (both in proton and carbon spectra). As expected, quaternization does not affect the copolymer configuration. Heteronuclearcorrelated two-dimensional spectra can help in assigning the spectra.ALMERIA NATANSOHN et ADI EISENBERG. Can. J. Chem. 65, 1873Chem. 65, (1987.On rapporte les spectres rmn du 'H et du 13c, mesurks en solution, du poly(m6thacrylate de mithyle-co-vinyl-4 pyridine), du poly(mCthacry1ate de methyle-co-methyl-2 vinyl-5 pyridine) et de leurs dkrivis obtenus par quaternisation avec I'iodure de methyle. Les unites structurales vinylpyridines foment environ 10% des kchantillons. Dans les diffkrents solvants, les spectres fournissent de l'information sur la distribution des sCquences ainsi que sur la configuration des copolym6res. Dans chacun des cas, on peut evaluer 5 0,5 la proportion d'addition cc coisotactique >> alternante, dkfinie comme la probabilite de trouver un groupement methoxy et un cycle pyridine cBte i cBte sur le m&me cote de la chaine principale. On peut dCduire cette information 5 partir du dkdoublement des signaux dus aux groupements aromatiques et mCthoxy (tant en rmn du 'H que du I3C). Comme on pouvait s'y attendre, la quaternisation n'affecte pas la configuration du copolymkre. Les spectres bidimensionnels htt6ronucltaires peuvent &tre utiles dans l'attribution des spectres.[Traduit par la revue]

Miscibility behavior and coil overlap in ionic blends of phenylated polytriphenylene oxide and poly(methyl methacrylate)

“…To obtain another estimate of the intermolecular distance in the blend, we performed a nuclear Overhauser and exchange spectroscopy (NOESY) experiment, but no cross peaks were observed between the two polymers. This suggests that the intermolecular distance has to be greater than 4 Å 29, 30. Also, in this system, traces of water were present, which might have prevented the efficient alignment of the two types of chains.…”

“…This suggests that the intermolecular distance has to be greater than 4 Å. 29,30 Also, in this system, traces of water were present, which might have prevented the efficient alignment of the two types of chains. A kinetic study that would determine which factors are decisive in this coil overlap process is in progress with a PMMA-4VP/PS-SSA blend.…”

Copolymerization of methyl methacrylate with 4‐vinylpyridine initiated by a novel Ni(II)α‐Benzoinoxime complex

“…Unfortunately, this region cannot be investigated in v‐centered sequence distribution calculation owing to the poor resolution of our spectra. Indeed, Natanshon and Eisenberg37 have related the magnitude of the splitting to the nature of the deuterated solvent used. Thus, the spectra recorded in DMSO solvent at 70°C provide better splitting than in chloroform or benzene because it lacks interfering signals.…”