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Atmospheric pressure plasma treatment of polyamide-12 foils

100%

Hanusová J., Kováčik D., Stupavská M., Černák M., Novák I.

Open Chemistry

2015

vol. 13

issue 1

The surface of a polyamide-12 (PA-12) foil was modified in order to improve the adhesive properties by two types of atmospheric pressure plasma sources. The samples were characterized using contact angle measurement, adhesive properties measurement and X-ray photoelectron spectroscopy (XPS). The ageing of the plasma modification was also studied. A significant increase in wettability was observed at different treatment times. The same effect was also seen in the adhesive properties - the adhesion was increased almost 12 times for 10 s DCSBD treatment in comparison to untreated PA-12. XPS analysis confirmed chemical changes due to the plasma modification of the PA-12. It was concluded that both plasma sources improve the adhesive properties of PA-12, with DCSBD obtaining better results.

Nonthermal plasma modification of polypropylene fibres for cementitious composites

86%

Morávek T., Fialová M., Kopkáně D., Ráheľ J., Sťahel P., Černák M.

Open Chemistry

2015

vol. 13

issue 1

The plasma treatment of polypropylene fibres used as concrete admixtures for improving its mechanical properties is the focus of this research paper. A plasma treatment was conducted in a low-temperature plasma environment at atmospheric pressure in a DCSBD (Diffuse Coplanar Surface Barrier Discharge). The degree of hydrophilicity caused by the plasma treatment was determined by measuring the rate of penetration of water into the porous media, commonly referred to as the Washburn method. The influence of the addition of PP (polypropylene) fibres to the concrete matrix was investigated using a three point bending test which determined the flexural strength of concrete samples. Our experiments demostrate that plasma improves both the wettability of PP fibres and its adhesion to the concrete matrix. The tests of flexural strength show, that even a short plasma treatment (5 s) can have a significant impact on the mechanical properties of fibre-reinforced concrete composite.

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2 Open Chemistry

2 2014

2 Černák M.

1 Fialová M.

1 Hanusová J.

1 Kopkáně D.

1 Kováčik D.

1 Morávek T.

1 Novák I.

1 Ráheľ J.

1 Stupavská M.

1 Sťahel P.

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Atmospheric pressure plasma treatment of polyamide-12 foils

Nonthermal plasma modification of polypropylene fibres for cementitious composites