Dariusz 8628 | Technical University of Lodz (original) (raw)
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Papers by Dariusz 8628
Advances in Science and Technology, 2010
The work reviews the state-of-the-art in the field of ceramizable silicone rubber-based composite... more The work reviews the state-of-the-art in the field of ceramizable silicone rubber-based composites used in cable industry. Phenomenon of ceramization is based on preventing volatiles of polymer thermal decomposition from evacuation by creation of ceramic layer in composite surface. Usually, the layer is composed of mineral filer particles, connected by fluxing agent. The ceramic barrier has to characterize itself by micro-porous structure: -protecting copper wire inside the cable from heat transfer leading to melting, and -exhibiting good mechanical strength, assuring integrity of electrical circuit. Subject literature provides information on the application of Ca-or Al-based mineral fillers, combined with fluxing systems, to fill silicone rubber -silica compounds. In this study various mineral fillers, together with boron oxide as a fluxing agent, have been tested. Acidic character of B 2 O 3 , inhibiting peroxide curing of silicone rubber, was compensated by admixing of MgO and its good dispersion in the composite matrix, was obtained by co-grinding of the minerals, enabling the decrease of their particle size. The best ceramic phase, created on fire, was found for composites filled with wollastonite or mica. They represent the lowest mass loss and the stable porosity of ceramic phase up to the highest temperatures tested.
Vacuum, 2009
Press-moulded ultra-high molecular weight polyethylene (UHMWPE) samples were subjected to ion bom... more Press-moulded ultra-high molecular weight polyethylene (UHMWPE) samples were subjected to ion bombardment and effects of the modification studied. Helium, nitrogen, argon and silver ions of energy 65-150 keV and fluences in the range of 1 Â 10 14 to 3 Â 10 16 /cm 2 were applied. The consequences of the modification were studied with FT-IR, Raman and AFM techniques, contact angle measurements, bacteriostaticity and thrombogeneity tests. Surface layer oxidation, graphitization and changes to the surface geometry lead to increase of the surface energy. Modified surface exhibits bacteriostatic properties particularly for higher ion fluences. Aggregation of blood platelets on polymer surface subjected to ion bombardment is limited.
Advances in Science and Technology, 2010
The work reviews the state-of-the-art in the field of ceramizable silicone rubber-based composite... more The work reviews the state-of-the-art in the field of ceramizable silicone rubber-based composites used in cable industry. Phenomenon of ceramization is based on preventing volatiles of polymer thermal decomposition from evacuation by creation of ceramic layer in composite surface. Usually, the layer is composed of mineral filer particles, connected by fluxing agent. The ceramic barrier has to characterize itself by micro-porous structure: -protecting copper wire inside the cable from heat transfer leading to melting, and -exhibiting good mechanical strength, assuring integrity of electrical circuit. Subject literature provides information on the application of Ca-or Al-based mineral fillers, combined with fluxing systems, to fill silicone rubber -silica compounds. In this study various mineral fillers, together with boron oxide as a fluxing agent, have been tested. Acidic character of B 2 O 3 , inhibiting peroxide curing of silicone rubber, was compensated by admixing of MgO and its good dispersion in the composite matrix, was obtained by co-grinding of the minerals, enabling the decrease of their particle size. The best ceramic phase, created on fire, was found for composites filled with wollastonite or mica. They represent the lowest mass loss and the stable porosity of ceramic phase up to the highest temperatures tested.
Vacuum, 2009
Press-moulded ultra-high molecular weight polyethylene (UHMWPE) samples were subjected to ion bom... more Press-moulded ultra-high molecular weight polyethylene (UHMWPE) samples were subjected to ion bombardment and effects of the modification studied. Helium, nitrogen, argon and silver ions of energy 65-150 keV and fluences in the range of 1 Â 10 14 to 3 Â 10 16 /cm 2 were applied. The consequences of the modification were studied with FT-IR, Raman and AFM techniques, contact angle measurements, bacteriostaticity and thrombogeneity tests. Surface layer oxidation, graphitization and changes to the surface geometry lead to increase of the surface energy. Modified surface exhibits bacteriostatic properties particularly for higher ion fluences. Aggregation of blood platelets on polymer surface subjected to ion bombardment is limited.