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Wyszukujesz frazę "Przybytniak, G." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Prognozowanie i diagnozowanie starzenia kabli w elektrowniach jądrowych
    Autorzy:
    Boguski, J.
    Przybytniak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/214681.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    elektrownia jądrowa
    starzenie kabli
    degradacja oksydacyjna
    czas eksploatacji kabli
    Źródło:
    Postępy Techniki Jądrowej; 2012, 4; 7-14
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation processing of polymers and semiconductors at the Institute of Nuclear Chemistry and Technology
    Autorzy:
    Zimek, Z.
    Przybytniak, G.
    Kałuska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146107.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam accelerators
    radiation processing
    Opis:
    R&D studies in the field of radiation technology in Poland are mostly concentrated at the Institute of Nuclear Chemistry and Technology (INCT). The results of the INCT works on polymer and semiconductor modification have been implemented in various branches of national economy, particularly in industry and medicine. Radiation technology for polymer modification was implemented in the middle of the 1970-ties. Among others, the processes of irradiation and heat shrinkable products expansion have been developed. The transfer of this technology to Polish industry was performed in the middle of the 1980-ties. The present study aims at the formulation of new PE composites better suited to new generation of heat shrinkable products, for example, a new generation of hot-melt adhesives has been developed to meet specific requirements of customers. Modified polypropylene was used for the production of medical devices sterilized by radiation, especially disposable syringes, to overcome the low radiation resistance of the basic material. Modified polypropylene (PP-M) has been formulated at the INCT to provide material suitable for medical application and radiation sterilization process. Modification of semiconductor devices by EB was applied on an industrial scale since 1978 when the INCT and the LAMINA semiconductor factory successfully adopted that technology to improve specific semiconductor devices. This activity is continued on commercial basis where the INCT facilities served to contract irradiation of certain semiconductor devices according to the manufacturing program of the Polish factory and customers from abroad.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 129-132
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model studies on phenolic antioxidant role in radiation - and thermally - induced accelerated degradation of electrical cable insulation
    Autorzy:
    Boguski, J.
    Przybytniak, G.
    Mirkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146778.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    antioxidant
    radiation
    degradation
    aging
    polyethylene
    Irganox 1035
    Opis:
    The main objective of this work was to establish a correlation between radiation- and thermally-induced changes in polyethylene and the amount of compounded phenolic antioxidant (Irganox 1035). Radiation yield of oxygen consumption, oxidative induction time and gel fraction allowed to estimate the utility of the applied experimental methods to monitor oxidative aging of the polymeric material from the standpoint of cable and wire degradation in nuclear power plants. It was found that the phenolic antioxidant not only inhibits chain oxidation but also changes the mechanisms of radical processes influencing significantly capability of polyethylene towards thermally-induced cross-linking.
    Źródło:
    Nukleonika; 2012, 57, 4; 485-489
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of polymers designed for radiation processing
    Autorzy:
    Przybytniak, G.
    Nowicki, A.
    Mirkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/148299.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polyethylene
    radiation processing
    cross-linking
    Opis:
    Five types of commercially available polyethylene (PE) and some selected blends with components supporting cross-linking were radiation cross-linked. Mechanical properties and gel fraction were determined upon electron beam irradiation to such a dose that induces about 60% gel fraction. It was confirmed that for easily cross-linked PEs strength at break usually was growing and for polyethylenes less susceptible to radiation cross-linking – was reduced. Similar dependence was found for elongation at break. It was confirmed that for polyethylenes demonstrating high strength at break the efficiency of radiation cross-linking is limited. Additionally, for selected polymeric materials, stress relaxation and accelerated thermal aging were estimated. In order to enhance cross-linking yield some blends with EVA copolymer (ethylene-vinyl acetate) were prepared. On the basis of the literature data, the influence of crystalline regions on cross-linking and mechanical properties was discussed as well.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 67-72
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Montmorillonite modified by unsaturated compatibilizing agents and by ionizing radiation as a potential filler in polymeric composites
    Autorzy:
    Nowicki, A.
    Przybytniak, G.
    Starosta, W.
    Sartowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/148548.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    composites
    montmorillonite
    unsaturated ammonium salts
    radiation treatment
    Opis:
    For last several years we have studied modifications of montmorillonite (MMT) with different agents and the structural changes resulting from the processes. The aim of present work was focused on the preparation of polymer composites from epoxy resin and dispersed phase modified chemically and subsequently activated by irradiation. The paper presents investigations concerning intercalation of MMT by the synthesized unsaturated organophilic agents (on the basis of quaternary ammonium salts). The process was studied by: wide-angle X-ray scattering (WAXS), Fourier- -transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA); additionally mechanical properties of the polymer composite as well as its microscopic structure were tested. It was found that unsaturated quaternary ammonium salts can intercalate between MMT layers. The possibility of radiation-induced compatibilization between modified MMT particles and polymeric matrix was also studied. It was confirmed by electron paramagnetic resonance (EPR) spectroscopy that in the synthesized salts stable radicals are formed during irradiation, however their influence on mechanical properties of the final composite is insignificant.
    Źródło:
    Nukleonika; 2010, 55, 3; 351-357
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functionalization of polymer surfaces by radiation-induced grafting
    Autorzy:
    Przybytniak, G.
    Kornacka, E. M.
    Mirkowski, K.
    Walo, M.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146746.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radiation grafting
    EPR
    radicals
    radiation yield
    Opis:
    The mutual radiation grafting of acrylic acid (AAc) onto polyethylene (PE), polypropylene (PP) and polystyrene (PS) films was performed. At first stage of investigations, the influence of ionizing radiation on the trunk polymers was studied, i.e. the level of radicals stable at room temperature and radiation yield of evolved hydrogen were estimated for each polymer. The measurements were carried out using electron paramagnetic resonance (EPR) spectroscopy and gas chromatography (GC), respectively. Radiation yields of radicals as well as hydrogen emission increased in the following order PS < PP < PE. Under comparable conditions, the same relationship was found for the yield of radiation-induced grafting of AAc. A distinct correlation between content of radicals generated by ionizing radiation in polymeric matrices and grafting degree was confirmed for the studied materials. The effect of monomer and inhibitor concentrations on the efficiency of processes were studied as well.
    Źródło:
    Nukleonika; 2008, 53, 3; 89-95
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of hindered amine light stabilizers on the resistance of polypropylene towards ionizing radiation
    Autorzy:
    Przybytniak, G.
    Mirkowski, K.
    Rafalski, A.
    Nowicki, A.
    Legocka, I.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/148686.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polypropylene
    stabilizers
    HALS
    electron beam
    apparent viscosity
    nucleation agent
    Opis:
    The influence of hindered amine light stabilizers (HALSs) on physical and mechanical properties of irradiated and non-irradiated isotactic polypropylene (PP) was studied. The stabilizers under investigation were: Tinuvin 765 (T765) and Tinuvin 622 (T622) - derivatives of 1,2,2,6,6-pentamethyl piperidine and Chimassorb 944 (C944) - a derivative of 2,2,6,6-tetramethyl piperidine. It was found that the stabilizers reduce the amount of peroxyl radicals in the amorphous phase of PP. The irradiation with electron beam causes a drop of apparent viscosity both in the original and in the modified PP however the effect is smaller in the presence of HALSs. Admixture of T622 and T765 stabilizers increases the crystallization temperature of non-irradiated PP by about 8 10°C (measured by DSC) what results from the facilitated formation of a large number small microcrystals. It was concluded that HALSs initiate two opposite tendencies - chemical protection against damage initiated by free radicals and, simultaneously, physical enhancement of sensitivity towards irradiation by the increase of nucleation density. In the studied systems, the presence of maleic anhydride does not improve compatibility between the polymeric matrix and HALSs.
    Źródło:
    Nukleonika; 2005, 50, 4; 153-159
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of radiation sterilization on poly(ester urethanes) designed for medical applications
    Autorzy:
    Przybytniak, G.
    Kornacka, E.
    Ryszkowska, J.
    Bil, M.
    Rafalski, A.
    Woźniak, P.
    Lewandowska-Szumieł, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146105.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polyurethane
    radiation sterilization
    EPR
    cross-linking
    degradation
    Opis:
    Preparation of scaffolds for tissue regeneration requires elucidation of chemical and physical processes induced by ionizing radiation during radiation sterilization of polymeric materials used for these purposes. Such treatment induces many unintended and desired reactions that lead either to degradation or cross-linking of macromolecules. It was found that in poly(ester urethane) the ester segments are responsible predominantly for radiation induced phenomena. Some radicals generated following irradiation were identified under cryogenic conditions. Upon exposure to sterilizing dose cross-linking was confirmed on the basis of rheological changes in melted polymers. The results obtained by EPR spectroscopy and DRS revealed a relatively high susceptibility of poly(ester urethanes) on oxidation.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 121-128
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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