Local mechanical properties of plasma treated polystyrene surfaces

Article Abstract:

Indentation measurements are performed on the polymer in the elastic and plastic regime to study how a local air plasma treatment affects the mechanical properties of polystyrene. The treated sample could not show any differences in the elastic-plastic properties of the polymer in the two regions, however an increased stiffness with respect to that of the unmodified sample was measured in both regions which suggest that an uppermost layer of the polymer is crosslinked due to plasma irradiation.

Observations, Irradiation, Atomic force microscopy, Irradiation (Radiation exposure)

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Transport behavior of oxygen and nitrogen through organasilicon-containing polystyrenes by molecular simulation

Article Abstract:

Molecular dynamics simulations were used to study the transport properties of oxygen and nitrogen in the para-substituted polystyrenes, which possess one to four Si atoms in each substituent. It was found that the solubility of oxygen increased with increasing Si content in the polymer membrane and the para-substituted polystyrenes with a branched substituent at the alpha-position showed higher permeability than those of the nonbranched ones.

Molecular dynamics, Monte Carlo method, Monte Carlo methods

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Effect of temperature and pressure on surface tension of polystyrene in supercritical

Article Abstract:

The surface tension of polymers in supercritical carbon dioxide is determined by using Axisymmetric Drop Shape Analysis-Profile (ADSA-P). The results have shown a linear relationship between surface tension and temperature and between surface tension and pressure, indicating the slope of surface tension change with temperature to be dependent on pressure.

Science & research, Industrial Gas Manufacturing, Industrial gases, Carbon Dioxide, Research, Thermal properties, Surface tension, Entropy (Physics), Entropy (Thermodynamics)

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