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    Wyświetlanie 1-4 z 4
    Tytuł:
    Impact of Impurities of Polypropylene and Silicone Inclusions on the Properties of Polyamide 6.6 Regranulates Derived from the Re-Processing of Airbags
    Autorzy:
    Stachowiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2106560.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    recycling
    composites
    polyamide 6.6
    MFR
    mechanical properties
    Opis:
    The following article presents the results of selected properties of regranulates of polyamide 6.6, regranules of polyamide contaminated with polypropylene and regranules of polyamide contaminated with silicone. The tested materials came from the reprocessing of polyamides 6.6 originally derived from production of airbags from renowned world producers (material for the research came from production waste). The results of examination were referred to regranulates of uncontaminated polyamide but also obtained from waste from the production of these airbags. The influence of impurities on properties of regranulates such as their density and melt flow index was assessed. The tests allowed to show a significant impact of impurities on the density but above all on the mass and volume flow rate index which ranged from 47 to 116 g/10 min. In the case of standardized test specimens selected thermal and mechanical properties were analyzed. Differential scanning calorimetry was used to assess the impact of impurities on the thermal properties of polyamides, allowing primarily identification of materials and impurities (especially polypropylene) as well as characteristic temperatures and the enthalpy of melting of the materials being analyzed. The mechanical properties were assessed using a DMA device. DMA research allowed to determine changes in mechanical properties in a wide temperature range of tested materials. It allowed to obtain full characteristics of changes in material stiffness under the influence of two factors, i.e. temperature and content of impurities, like polypropylene or silicone.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 455--463
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Processing Conditions on Selected Properties of Polyamide 6 Composites Filled by Modified Bentonite
    Autorzy:
    Gnatowski, Adam
    Gołębski, Rafał
    Stachowiak, Krystian
    Powiązania:
    https://bibliotekanauki.pl/articles/2049714.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polyamide 6
    composites
    bentonite
    structure
    thermomechanical properties
    Opis:
    The aim of this study was to present the results of the examinations of the structure and thermomechanical properties of PA6/NanoBent composite. NanoBent composites composed of minerals from the smectite group (mainly montmorillonite) were used for modification of polyamide 6. PA6 composite with content of 1, 3, 5% of NanoBent was prepared in a Theysohn TSK 75-N twin screw extruder. The samples were prepared using the injection technology by means of a Krauss-Maffei KM65-160 C1 injection molding machine. The samples of composites obtained at different injection temperatures and injection mold temperatures were used for the examinations. Degree of crystallinity was examined using the DSC method whereas the material structure was examined with an optical microscope. DSC studies showed a reduction in the value of the degree of crystallinity with the increasing content of nanofiller in the polymer material. The narrowing of the peak was recorded in the DSC thermograms for nanocomposites with greater percentage of the nanofiller. Dynamical properties of polyamide 6 nanocomposite were also determined in relation to temperature and frequency. The samples were bended at frequencies of 1 Hz and 10 Hz over the temperature range from –100°C to 180°C and the heating rate of 2K/min. A significant increase in storage modulus was observed for PA6 samples with the content of 5% of NanoBent obtained at the injection temperature of 270°C and mold temperature of 70°C. smaller size of spherulites and arrangement of structural elements in clusters along the line of polymeric material flow in the mold cavity at higher contents of NanoBent were observed during structural examinations of the composites.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 2; 483-487
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Additive Manufacturing of WC-Co by Indirect Selective Laser Sintering (SLS) using High Bulk Density Powders
    Autorzy:
    Gădălean, Rares Vasile
    Jucan, Ovidiu-Darius
    Chicinaş, Horea
    Bâlc, Nicolae
    Popa, Catalin O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106562.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    selective laser sintering
    cemented carbide
    polyamide 12
    Opis:
    Research in additive manufacturing of tungsten carbide-cobalt has intensified over the last few years due to the increasing need for products designed using topology optimisation and multiscale structures (lattice). These products result in complex shapes and contain inner structures that are challenging to produce through conventional techniques, thus involving high costs. The present work addresses this problem using a two-step approach to 3D print parts with complex shapes and internal structures by employing indirect selective laser sintering (SLS) and tungsten carbide-cobalt sintering. The paper takes further our research in this field [1] to improve the part density by using high bulk density tungsten carbide-cobalt powders. Mechanically mixing tungsten carbide-cobalt with the sacrificial binder, polyamide 12, results in a homogenous powder successfully used by the selective laser sintering process to produce green parts. By further processing, the green parts through a complete sintering cycle, an average final part density of 11.72 g/cm3 representing more than 80% of the theoretical density is achieved.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 577--585
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of conditioning upon the mechanical properties of polyamide
    Wpływ kondycjonowania poliamidu na zmianę właściwości mechanicznych
    Autorzy:
    Garbarski, J.
    Fabijański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175863.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polymeric materials
    polyamide
    conditioning
    mechanical properties
    materiały polimerowe
    poliamid
    kondycjonowanie
    właściwości mechaniczne
    Opis:
    Polyamide is one of the basic engineering polymeric materials. It is used in many varieties which are characterized by different properties. Conditioning this material is necessary to obtain suitable mechanical properties. In this paper the results of strength testing of both unfilled and filled with 30% glass fiber polyamide 6 and the effect of duration of water conditioning upon the mechanical properties are presented.
    Poliamid jest jednym z podstawowych materiałów polimerowych inżynierii. Stosowany jest w wielu odmianach, które charakteryzują się różnymi właściwościami. W celu uzyskania odpowiednich właściwości mechanicznych napełnia się go włóknem szklanym, które znacząco podnosi wytrzymałość, ale również stosuje się kondycjonowanie w wodzie o odpowiedniej temperaturze, które nie pozostaje bez wpływu na właściwości gotowego wyrobu.
    Źródło:
    Advances in Manufacturing Science and Technology; 2015, 39, 2; 61-69
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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