TY - JOUR
T1 - Oxygen adsorption on poly(2,6-dimethyl)phenyleneoxide: a solid state 1H NMR study
AU - CAPITANI, D.
AU - CLERICUZIO, Marco
AU - FIORDIPONTI, P.
AU - LILLO, F.
AU - SEGRE, A. L.
PY - 1993
Y1 - 1993
N2 - Solid aromatic polymers are capable of adsorbing O2 molecules on aromatic rings selectively. The amount of adsorbed oxygen is affected by the chemical nature of the polymer, by the crystalline amorphous ratio, by the kind of crystal structure (polymorphism), and by molecular motions. In particular poly(1,4-oxy 2,6-dimethyl)phenylene is capable of adsorbing large amounts of O2 as demonstrated by its selectivity in O2/N2 permeability. A 1H-NMR relaxation study was performed on solid PPO as a function of temperature, and at different [PPO]/[O2] molar ratios. At low temperature an almost quantitative PPO-oxygen complexation is demonstrated. Moreover a careful study of NMR relaxations T1, T1p, of i.r. spectra, and a comparison with literature data, reveals the presence of two dynamic transitions at temperatures well below the T8. One of these transitions is frequency dependent and probably related to a delocalized motion along the backbone; the other one, frequency independent, seems to be related to a ring flip.
AB - Solid aromatic polymers are capable of adsorbing O2 molecules on aromatic rings selectively. The amount of adsorbed oxygen is affected by the chemical nature of the polymer, by the crystalline amorphous ratio, by the kind of crystal structure (polymorphism), and by molecular motions. In particular poly(1,4-oxy 2,6-dimethyl)phenylene is capable of adsorbing large amounts of O2 as demonstrated by its selectivity in O2/N2 permeability. A 1H-NMR relaxation study was performed on solid PPO as a function of temperature, and at different [PPO]/[O2] molar ratios. At low temperature an almost quantitative PPO-oxygen complexation is demonstrated. Moreover a careful study of NMR relaxations T1, T1p, of i.r. spectra, and a comparison with literature data, reveals the presence of two dynamic transitions at temperatures well below the T8. One of these transitions is frequency dependent and probably related to a delocalized motion along the backbone; the other one, frequency independent, seems to be related to a ring flip.
UR - https://iris.uniupo.it/handle/11579/3612
M3 - Article
SN - 0014-3057
VL - 29
SP - 1451
EP - 1456
JO - European Polymer Journal
JF - European Polymer Journal
ER -