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Moraczewski K.,University Kazimierza Wielkiego | Stepczynska M.,University Kazimierza Wielkiego | Zenkiewicz M.,Instytut Inzynierii Materialow Polimerowych i Barwnikow
Polimery/Polymers | Year: 2014

The effect of the modification of poly(lactic acid) (PLA) surface layer using corona treatment in air or nitrogen was evaluated by determination of oxidation degree, contact angle measurements and surface free energy calculations. It was found that as a result of corona discharge the degree of PLA surface layer oxidation increases independently of the applied unit activation energy Ej as well as the type of atmosphere used. However, the degree of nitriding of the samples modified under nitrogen increases with an increase of Ej value and is higher than for the samples modified in air. It was also found that corona discharges in both air and nitrogen atmospheres result in the changes in contact angle values of water and diiodomethane on PLA surface layer as well as an increase of surface free energy. Source


Zenkiewicz M.,University Kazimierza Wielkiego | Rytlewski P.,University Kazimierza Wielkiego | Malinowski R.,Instytut Inzynierii Materialow Polimerowych i Barwnikow
Polimery/Polymers | Year: 2011

This paper constitutes a comprehensive review of the literature on the application of low-temperature plasma for the modification of the surface layers (SL) of polymeric materials (Figs 1-3, Table 1). The main objectives for modification of these materials have been discussed and a short description of the basic methods of modification has been presented. The principles of low-temperature plasma and the way in which it influences selected properties of the surfaces of polymers have also been evaluated. The application of low-temperature plasma generated under atmospheric or reduced pressures in some selected modification methods with special consideration of the corona discharge method in air has been presented (Figs 4-11). Source


Stepczynska M.,University Kazimierza Wielkiego | Zenkiewicz M.,Instytut Inzynierii Materialow Polimerowych i Barwnikow
Przemysl Chemiczny | Year: 2011

Surface layer of polylactid films (thickness 100 μm) was treated with corona discharge in air or in He to improve their adhesive properties. Changes of the chem. structure of the corona-treated layers was studied by photoelectron spectroscopy to det. the oxidn. degree. The He atm. used was more efficient than the air one. Source


Fraszczak Z.,Instytut Inzynierii Materialow Polimerowych i Barwnikow
Przemysl Chemiczny | Year: 2012

Innovative single-screw extruders were constructed to improve output capacity and effectiveness of extrusion. Several modern plasticizing systems and screw drives diminishing the prodn. costs at the unchanged high product quality were described. Source


Polylactide (PLA) was filled with derivatives of polyhexamethyleneguanidine (PHMG) to produce resp. composites studied then for their melt flow index and BOD before and after biodegradn. in river water. Sulfanilic acid salt of PHMG was the most efficient additive to the PLA composites studied. Source

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