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Wyszukujesz frazę "radiation cross-linking" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of polyethylene cross-linking on properties of foams
    Autorzy:
    Głuszewski, Wojciech
    Stasiek, Andrzej
    Raszkowska-Kaczor, Aneta
    Kaczor, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/147154.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polyethylene foam
    radiation cross-linking
    postradiation oxidation
    Opis:
    The process of cross-linking of polyethylene using gamma radiation (γ) and electron beam (EB) was tested from the point of view of density of foam. Particular attention was paid to the postradiation oxidation effect of the polymers. The study used two types of radiation sources of varying dose rates: gamma radiation (4 kGy/h) and EB (14 000 kGy/h). Radiolysis studies of the polymers used the radiation yield of hydrogen evolved (GH2 , approximately proportional to the number of radicals) and radiation yield of oxygen absorbed by the polymer (GO2 ). Oxidation of polymer due to radiation was also evaluated using diffuse reflectance spectroscopy.
    Źródło:
    Nukleonika; 2020, 65, 3; 81-85
    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:
    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
    Tytuł:
    Crosslink the Novel Group of Polymeric Binders BioCo by the UV-radiation
    Autorzy:
    Grabowska, B.
    Kaczmarska, K.
    Bobrowski, A.
    Kurleto-Kozioł, Ż
    Szymański, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/380418.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    UV radiation
    spectroscopy
    polymeric binder BioCo
    BioCo
    moulding sands
    cross-linking
    promieniowanie UV
    spektroskopia
    spoiwo polimerowe BioCo
    masa formierska
    Opis:
    The spectroscopic FT-IR and FT-Raman methods allowed to identify the cross-linking process of the aqueous composition of poly(acrylic acid)/sodium salt of carboxymethyl starch (PAA/CMS-Na) applied as a binder for moulding sands (as a novel group binders BioCo). The cross-linking was performed by physical agent, applying the UV-radiation. The results of structural studies (IR, Raman) confirm the overlapping of the process of cross-linking polymer composition PAA/CMS-Na in UV radiation. Taking into account the ingredients and structure of the polymeric composition can also refer to a curing process in a binder - mineral matrix mixture. In the system of binder-mineral matrix under the influence of ultraviolet radiation is also observed effect of binding. However, the bonding process does not occur in the entire volume of the investigated system, but only on the surface, which gives some possibilities for application in the use of UV curing surface of cores, and also to cure sand moulds in 3D printing technology.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 85-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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