Results 81 to 90 of about 996 (138)
Some of the next articles are maybe not open access.
Materials Today: Proceedings, 2021
Abstract Polymethacrylic acid (PMAA) and modified Polymethacrylic acid functionalized with catechol (PMAA/CAT), hydroquinone (PMAA/HQ) and catechol-hydroquinone (PMAA/CAT-HQ) were synthesized by oxidative decarboxylation method using ammonium persulphate as an oxidant and characterized using UV–Visible spectroscopy, FT-IR, XRD, TGA and SEM studies ...
J. Devakumar +3 more
openaire +1 more source
Abstract Polymethacrylic acid (PMAA) and modified Polymethacrylic acid functionalized with catechol (PMAA/CAT), hydroquinone (PMAA/HQ) and catechol-hydroquinone (PMAA/CAT-HQ) were synthesized by oxidative decarboxylation method using ammonium persulphate as an oxidant and characterized using UV–Visible spectroscopy, FT-IR, XRD, TGA and SEM studies ...
J. Devakumar +3 more
openaire +1 more source
ECS Journal of Solid State Science and Technology, 2021
Polymethacrylic acid (PMAA) and substituted polymethacrylic acid (PMAA/HQ) with para dihydroxy benzene (HQ) were synthesized via free radical polymerization and they were characterized using UV–vis, FT- IR, XRD spectral studies. The UV–vis spectrum of both PMAA and PMAA/HQ shows transitions due to π
J. Devakumar +5 more
openaire +1 more source
Polymethacrylic acid (PMAA) and substituted polymethacrylic acid (PMAA/HQ) with para dihydroxy benzene (HQ) were synthesized via free radical polymerization and they were characterized using UV–vis, FT- IR, XRD spectral studies. The UV–vis spectrum of both PMAA and PMAA/HQ shows transitions due to π
J. Devakumar +5 more
openaire +1 more source
The sedimentation and diffusion of sodium polymethacrylate and polymethacrylic acid
Journal of Polymer Science, 1954AbstractThe sedimentation constants and diffusion coefficients of sodium polymethacrylate and of polymethacrylic acid have been determined at various concentrations of polymer and of added electrolyte and the nature of the charge effects is considered. A ratio y = (molarity of added electrolyte)/(grundmolarity of polymer) is used to obtain S20 at y = ∞
G. J. Howard, D. O. Jordan
openaire +1 more source
Potentiometric behavior of polymethacrylic acid
Journal of Polymer Science Part A: General Papers, 1964AbstractThe potentiometric behavior of polymethacrylic acid is discussed in terms of a conformational transition. A thermodynamic treatment of this transition is presented. The titration curve of polymethacrylic acid is analyzed in a detailed way and quantitative information regarding the transition is obtained.
J. C. Leyte, M. Mandel
openaire +1 more source
Precipitation of trypsin with polymethacrylic acid
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1970It has been shown that the precipitation of trypsin with polymethacrylic acid results in a reversible or irreversible (after an incubation period) formation of a complex and, in the latter case, a stable, nonactive addition product can be isolated.
S. V. Kol'tsova +2 more
openaire +1 more source
The thermal decomposition of polymethacrylic acid
Polymer, 1960Abstract When polymethacrylic acid decomposes thermally at 200°C two separate reactions occur. The minor one is depolymerization which results in small yields of monomer. The major reaction is anhydride formation by elimination of water between pairs of carboxyl groups.
D.H. Grant, N. Grassie
openaire +1 more source
Immobilization of BSA on the polymethacrylic acid
2013 ICME International Conference on Complex Medical Engineering, 2013N, N'-Methylenebisacrylamide was used as the crosslinking agent to prepare the polymethacrylic acid and its carboxyl groups were modified by N-(3-Dimethy-laminopropyl)-N'-ethyl carbodiimide hydrochloride and N-Hydroxy succinimide. The ability of immobilizing BSA and the influence of reacting time of carrier were studied.
null Fang Lv +4 more
openaire +1 more source
Kinetics of hydrolysis of polymethacrylic acid esters
Polymer Science U.S.S.R., 1975Abstract Polymethacrylic acid esters have been used as examples in the development of methods for the preparation of stereoregular polymer models with a random distribution of units in the macromolecular chains, and these are used to determine individual rate constants reflecting the effect which adjacent units have on the reactivity of functional ...
A.D. Litmanovich +8 more
openaire +1 more source
The gelation of aqueous solutions of polymethacrylic acid☆
Polymer, 1962Abstract The dependence of rigidity and viscosity on concentration and temperature of aqueous solutions of polymethacrylic acid was measured in a specially designed viscoelastometer. The solutions show no rigidity up to a certain critical concentration range (depending on the degree of polymerization) of about one per cent in which the rigidity rises
J ELIASSAF, A SILBERBERG
openaire +1 more source
The dissociation and specific viscosity of polymethacrylic acid
Recueil des Travaux Chimiques des Pays-Bas, 1950AbstractSolutions of polymethacrylic acid have been partially neutralized to different extents, and the pH values and viscosities of the resulting solutions determined. These measurements were carried out at several different potassium chloride concentrations, and on several polymer samples.
R. Arnold, J. Th. G. Overbeek
openaire +1 more source