I. G. Kalinina

Negative temperature coefficient in the oxidation of polypropyleneketone

Abstract Oxidation of polypropyleneketone by molecular oxygen in the range 80–190°C has been investigated. The rate of oxygen consumption decreases with increasing temperature in the range 140–180°C. Reaction involves mainly the zones of short-range order violation comprising about 11% of the polymer. Mechanisms of the phenomena are discussed.

Solubility of low-molecular-mass compounds in copolymers

The solubility of some low-molecular-mass antioxidants in polyethylene-based copolymers was studied. It is shown that another copolymer has a complex effect on the solubility of low-molecular-mass compounds and the concentration of their saturated vapor over the copolymers.

Antioxidant effectiveness in polymer blends

Abstract The connection between the apparent rate constant of chain termination by an antioxidant and the sorption properties of the polymer towards this antioxidant is discussed. Experiments have shown that in oxidation of polyethylene-polypropylene and polyethylene-poly(methylstyrene) blends at 180 °C in the presence of the antioxidant phenyl-β-naphthylamine, the critical antioxidant concentration changes in the direction opposite to the antioxidant concentration in the vapor phase.

Effect of p-toluensulfonic acid on oxidation of polyethylene and polyethylene-poly-p-methylstyrene blends

Abstract p -Toluensulfonic acid retards oxidation of polyethylene and, to a greater extent, of polyethylene-poly- p -methylstyrene blends. The real antioxidant is p -cresol, formed by p -toluensulfonic acid transformation in oxidizing polyethylene and, in blends, through peroxidation and subsequent acid-catalyzed decomposition of hydroperoxides of poly- p -methylstyrene.

Variation of Antioxidant Effectivity with Copolymer Composition

Abstract The variation of inhibited oxidation parameters with the composition of ethylene-propylene and ethylene-vinyl chloride copolymers is studied. In both cases the antioxidant effectivity is minimal in copolymers containing small amounts of the second monomer groups.