V. V. Rybkin

The Treatment of Textile Materials in Air Plasma

The effect of treatment in an air glow-discharge plasma on a poly(ethylene terephthalate) film and fabric with different specific surface areas was examined. The rates of mass loss, oxygen uptake, and evolution of gaseous products (CO2 СО, H2O, H2) were measured over the pressure range 50–200 Pa at a sample temperature of 357 K. It was found that textiles with different textures had different specific etching rates. Possible reasons for this phenomenon are discussed.

Influence of the Texture of Woven Materials on Their Etching Rate in Oxygen Plasma

The oxygen glow-discharge plasma treatment of a poly(ethylene terephthalate) film and fabric differing in their specific surface area was studied. The rates of mass loss, oxygen uptake, and gas evolution were measured over the discharge current and pressure ranges 20–110 mA and 50–200 Pa, respectively, at a sample temperature of 357 K. The specific etching and product formation rates calculated with accounting for the total surface area of fabric samples were shown to be not affected by the texture of studied materials.

Application of barrier discharge to the treatment of water from phenol: Reactor thermal characteristics

Decomposition of phenol in an aqueous solution under the action of a surface barrier charge in oxygen at atmospheric pressure and the thermal characteristics of the reactor are studied. The phenol decomposition degree reaches 99%, and as high as 80% of the composition of the resulting products are represented by CO2 molecules. It is shown that the nature of the decomposition process is not thermic. It is found that the energy converted into the heat energy that heats the solution rises as the total energy supplied to the reactor increases. In this case, the total-energy fraction that was converted into the heat energy is decreased from 40 to 17%.

The Formation Kinetics of Gaseous Products at the Initiation Step of the Oxidative Degradation of Polyethylene in an Oxygen Plasma

The results of measurements of the rates of oxygen consumption and gaseous product formation at the initial stage of the action of an oxygen plasma and its flow-afterglow zone on the surface of low-density polyethylene films are given. It was found that degradation is a multichannel process in both plasma and afterglow zones, which begins with the abstraction of hydrogen molecules without the direct binding of gas-phase oxygen. Conceivable channel mechanisms are discussed.

Kinetic Features of the Formation of Gaseous Products upon Oxygen-Plasma Surface Treatment of Polyethylene, Polypropylene, Poly(ethylene terephthalate), and Polyimide Films

The results of measurements of the rates of mass loss, formation of gaseous products, and oxygen consumption during the surface treatment of polyethylene, polypropylene, poly(ethylene terephthalate), and polyimide films in a low-pressure oxygen plasma are reported. It was shown that CO2 and H2O were produced in the same process involving O(3P) atoms for all polymers, and the kinetic characteristics of the process were determined. The specific features of the plasma-enhanced oxidative degradation associated with the chemical composition of repeating units of these materials are discussed.

Kinetic Features of Initiation of Poly(ethylene terephthalate) Oxidative Degradation Processes in Oxygen Plasma

The results of measurements of time dependences for the formation rates of gaseous products and oxygen uptake rate in oxygen plasma treatment of a poly(ethylene terephthalate) film at discharge currents of 20–80 mA and a pressure ranging within 50–200 Pa are reported. The obtained data allow the authors to speculate on the mechanism of initiation of plasma-induced oxidative degradation of the material.