FIELD: chemistry.
SUBSTANCE: claimed invention relates to branched polymers and methods of their obtaining. Described is a branched polymer, consisting of 50-99.8 wt % (of the polymer weight) of units, formed by styrene and/or α-substituted alkyl styrenes - α-methyl-styrene, α-isopropyl-styrene and/or alkyl styrenes with substitution in a benzene ring - 4-methyl-styrene, 3-methyl-styrene, 2,5-dimethyl-styrene, p-tert-butyl-styrene, o-ethyl-styrene, m-ethyl-styrene, p-ethyl-styrene and/or halogen-substituted styrenes - 4-chloro-styrene, 4-bromo-styrene, 0.2-50 wt % of units, formed by isomers of divinylbenzene and/or its substituted analogues - o-divinylbenzene, m-divinylbenzene, p-divinylbenzene, and 0.0001-3.52 wt % of peroxide and/or hydroperoxide groups, with a weight part in it of oxygen atoms, present in the composition of functional groups, formed as a result of a radical-chain monomer or a polymer oxidation in the presence of oxygen - carbonyl, carboxyl, ketone, hydroxyl, peroxide, hydroperoxide, ether, ester groups, not more than 21.0 wt %. Also described are versions of methods of obtaining the said branched polymer, characterised by the fact that the methods are realised in the presence of dissolved in a liquid phase oxygen, concentration of which in the liquid phase is supported at the level not higher than 1.0×10-2 mol/l.
EFFECT: obtaining branched polymers with low content of peroxide groups and high molecular weight, which increases their thermal stability and prevents from changing physical-chemical characteristics in the process of storage and exploitation.
6 cl, 8 dwg, 2 tbl, 5 ex
