Ortho-positronium annihilation parameters in polyvinyl alcohol films with various degrees of polymerization, saponification and crystallinity
-
H. Muramatsu
Positron annihilation lifetime (PAL) spectroscopy has been applied to polyvinyl alcohol (PVA) films prepared with commercially available PVA or from polyvinyl acetate (PVAc). The variation of lifetimes of ortho-positronium (o-Ps) formed in the films was investigated as a function of the degrees of polymerization, saponification, or crystallinity. For the fully saponificated samples, no dependence was found to exist on the degrees of polymerization or of crystallinity. For the partially saponificated samples, however, the dependence of the o-Ps lifetime on the degree of saponification was clearly observed, and this is explained by both the formation of hydrogen bonds among the polymer chains and the existence of acetyl group strongly inhibiting the hydrogen-bond formation due to steric hindrance.
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
Artikel in diesem Heft
- Simultaneous production of 28Mg and 47Ca by high-energy heavy-ion irradiation for applications in biology
- Thermodynamic model for the solubility of PuO2(am) in the aqueous Na+-H+-OH--Cl--H2O-ethylenediaminetetraacetate system
- A kinetic model for the oxidation of U(IV) to U(VI) with O2: Determination of stability constants via oxidation kinetic experiments
- Fluorescence spectroscopy of U(VI) in the presence of perchlorate ions
- Liquid-liquid extraction of plutonium and americium by cekanoic acid from alkaline medium
- Study of the interaction of Pu(IV) and Np(IV,V,VI) with Fe hydroxides to predict the behavior of actinides in environmental media
- Multitracer studies on the effects of model acid rain on the adsorption of trace elements on soils
- Absorption of iodine from aqueous solutions on nuclear reactors alloys
- Pentavalent rhenium-188 dimercaptosuccinic acid: a new kit formulation and its initial evaluation in mice
- Ortho-positronium annihilation parameters in polyvinyl alcohol films with various degrees of polymerization, saponification and crystallinity
Artikel in diesem Heft
- Simultaneous production of 28Mg and 47Ca by high-energy heavy-ion irradiation for applications in biology
- Thermodynamic model for the solubility of PuO2(am) in the aqueous Na+-H+-OH--Cl--H2O-ethylenediaminetetraacetate system
- A kinetic model for the oxidation of U(IV) to U(VI) with O2: Determination of stability constants via oxidation kinetic experiments
- Fluorescence spectroscopy of U(VI) in the presence of perchlorate ions
- Liquid-liquid extraction of plutonium and americium by cekanoic acid from alkaline medium
- Study of the interaction of Pu(IV) and Np(IV,V,VI) with Fe hydroxides to predict the behavior of actinides in environmental media
- Multitracer studies on the effects of model acid rain on the adsorption of trace elements on soils
- Absorption of iodine from aqueous solutions on nuclear reactors alloys
- Pentavalent rhenium-188 dimercaptosuccinic acid: a new kit formulation and its initial evaluation in mice
- Ortho-positronium annihilation parameters in polyvinyl alcohol films with various degrees of polymerization, saponification and crystallinity
