Accession Number : ADA187258

Title :   High-Molecular Compounds (Selected Articles).

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

PDF Url : ADA187258

Report Date : 30 Oct 1987

Pagination or Media Count : 21

Abstract : Earlier it was shown that 33% emulsions of copolymers of methylmethacrylic (MA) with methylacrylic (MA) with the addition of acetophenone and other organic liquids in the amount of 10-40% acquire the property of sharply pronounced thixotropy, which is characterized by the reduction of viscosity by 5 orders in a narrow interval of stresses. Interpretation of this phenomenon is deserving of attention. In particular, it is interesting to discover whether it is possible to examine the onset of thixotropic properties as the result of the combination of the particles of a polymer with an additive, which occurs in a dispersion aqueous medium. The good solubility of copolymers in liquid-additives, established from data of light scattering, is a certain indirect indication of a possibility of such combination. However, in order to obtain direct evidence other methods are required, inconnection with which we selected the method of NMR. The results presented here of a study of the indicated systems by the NMR method are evidence of the qualitative change of particles of the dispersion due to the affect of the organic additive, which can be a consequence of the combination of particles with organic liquid in aqueous dispersion medium.

Descriptors :   *POLYMERS, *METHACRYLATES, *POLYMERIZATION, ACETOPHENONES, ADDITIVES, COPOLYMERS, DISPERSING, INTERVALS, LIGHT SCATTERING, LIQUIDS, PARTICLES, RUSSIAN LANGUAGE, SOLUBILITY, STRESSES, TRANSLATIONS, USSR, VISCOSITY, WATER, PLASTICS, MACROMOLECULES, ADDITION REACTIONS, COPOLYMERS, MONOMERS, NUCLEAR MAGNETIC RESONANCE, SPECTROSCOPY, EMULSIONS, METHYL RADICALS

Subject Categories : Polymer Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE