Accession Number : ADA185357

Title :   High-Molecular Compounds (Selected Articles).

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

PDF Url : ADA185357

Report Date : 04 Sep 1987

Pagination or Media Count : 30

Abstract : With radical polymerization in homogenous liquid phase at early stages of transformation lifetime of active centers is usually 1-5 s. We discovered, that during the polymerization of methylmethacrylate (MMA) in the presence of orthophosphoric acid at usual temperatures appear the long-lived radicals, which lead process actually by the mechanism of living chains , moreover system remains quasi-homogeneous. During investigation of photo-initiated polymerization in systems MMA - H3PO4 composition of 1:0.3 and 1:6 at 25 are discovered, that after disconnection of source of UV light reaction does not extinguish, but is continued with constant, somewhat less than light, speed up to virtually complete exhaustion of monomer during 10-20 hours (polymerization without preliminary illumination by UV light does not occur).

Descriptors :   *METHACRYLATES, METHYL RADICALS, POLYMERS, RUSSIAN LANGUAGE, TRANSLATIONS

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE