Results 121 to 130 of about 1,032 (170)

The thermal decomposition of polymethacrylic acid

Polymer, 1960
Abstract 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, 2013
N, 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, null Xiu-jie Liu, null Kai-yue Chi, null Rong-ji Dai, null Yu-lin Deng   +4 more
openaire   +1 more source

Kinetics of hydrolysis of polymethacrylic acid esters

Polymer Science U.S.S.R., 1975
Abstract 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, N.A. Plate, V.A. Agasandyan, O.V. Noa, E. Yun, V.I. Kryshtob, N.A. Luk'yanova, N.V. Lelyushenko, V.V. Kreshetov   +8 more
openaire   +1 more source

The dissociation and specific viscosity of polymethacrylic acid

Recueil des Travaux Chimiques des Pays-Bas, 1950
AbstractSolutions 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

Preparation of Polyvinyl Acetate Latexes Using Polymethacrylic Acid Surfactant Mixtures: Locus of the Polymethacrylic Acid

1980
Polymethacrylic acid functions as a protective colloid in the emulsion polymerization of vinyl acetate, particularly in combination with anionic-nonionic surfactants. The combination of polymethacrylic acid and a nonylphenolethoxylate ester of phosphoric acid gives high-solids latex which shows excellent stability to mechanical shear and reezing-and ...
W. E. Daniels, C. T. Enos, J. G. Iacoviello, J. H. Frost, J. W. Vanderhoff, S. M. Ahmed   +5 more
openaire   +1 more source

The decay of radicals in esters of polymethacrylic acid

European Polymer Journal, 1969
Abstract Free radicals produced by mechanical destruction of polymethylmethacrylate, polyethyl-methacrylate, polybutylmethacrylate and polyallylmethacrylate has been studied by the ESR method. The radicals decay in two temperature ranges around −40° and 50° (or + 5°).
B. Baková, M. Lazár
openaire   +1 more source

The gelation of aqueous solutions of polymethacrylic acid☆

Polymer, 1962
Abstract 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

Spectrophotometric titration of polymethacrylic acid

Journal of Polymer Science Part C: Polymer Symposia, 1967
AbstractOptical density measurements were performed on aqueous solutions of polymethacrylic acid (PMA) at different degrees of neutralization with NaOH, both in the presence and absence of added Na2SO4; the wavelength region studied was 188–250 mμ. The data could be consistently interpreted in terms of an equilibrium between two conformational states ...
openaire   +1 more source

PHOTOLYSIS OF POLYMETHACRYLIC ACID IN AQUEOUS SOLUTIONS

Canadian Journal of Chemistry, 1964
The photolysis of polymethacrylic acid was studied in aqueous solutions as a function of pH, polymer concentration, polymer chain length, and small additions of electrolytes in the absence of oxygen with light of wavelength 2537 Å. The random chain scission constants decrease with increasing pH values.
C. H. Chou, H. H. G. Jellinek
openaire   +1 more source

Laser Raman Spectra of Polymethacrylic Acid

The Journal of Chemical Physics, 1969
Laser-excited Raman spectra are reported for polymethacrylic acid as a solid, an aqueous gel, and a strongly alkaline aqueous gel. The spectrum of the neutral gel is identical with that of the solid, although alkalization produces some changes. The spectra are analyzed in terms of changes in chain configuration.
openaire   +1 more source