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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of extruder plasticizing systems on the selected properties of pla/graphite composite
    Autorzy:
    Kaczor, Daniel
    Bajer, Krzysztof
    Domek, Grzegorz
    Madajski, Piotr
    Raszkowska-Kaczor, Aneta
    Szroeder, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2204680.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    differential scanning calorimetry
    extrusion
    graphite
    infrared spectroscopy
    mechanical properties
    melting flow rate
    plasticizing system
    polylactide
    twin-screw extruder
    Opis:
    Twin-screw extrusion is a crucial method for the direct inserting of carbon micro- and nanomaterials into a polymer matrix using a dry procedure. The study aimed to determine the influence of the parameters of the twin-screw extruder plasticizing system on the dispersion homogeneity and distribution of graphite filler in the polylactide polymer matrix and overall quality of the composite. As a filler, a graphite micropowder with a 5 μm lateral size of platelets was used at concentration of 1 wt.%. Three configurations of screws with different mixing intensity and various types segments were considered in the extrusion experiments. Morphology and chemical structure of the obtained composites were examined using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy – attenuated total reflectance (FTIR-ATR) and Raman spectroscopy. Differential scanning calorimetry (DSC) and melting flow rate measurements (MFR) were used to asses thermal and rheological properties of the composites. Samples of the polylactide/graphite composites were also subjected to mechanical tests. The results show that the selection of the mechanical parameters of twin-screw extruder plasticizing system plays a key role in the preparation of the homogeneous PLA/graphite composites. Incorrect selection of the screw geometry results in poor mixing quality and a significant deterioration of the mechanical and thermal properties of the composites. Optimised mixing and extrusion parameters can be the starting point for the design of efficient twin-screw extruder plasticizing system for fabrication of PLA composites with carbon nanotube and graphene fillers.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 4; 316--324
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Coupled speakers directivity measurements for small acoustic omnidirectional source development
    Autorzy:
    Chojnacki, Bartłomiej
    Kamisiński, Tadeusz
    Juros, Klara
    Kaczor, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/127736.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    omnidirectional
    point sound sources
    coupled speaker set
    sound radiation patterns
    źródła dźwięku punktowego
    zestaw głośników
    wzorce radiacji dźwięków
    Opis:
    Acoustic monopole construction is unsolved task, which engineers try to solve for many years. In the past they constructed many innovative solutions, such as spark or laser-gap sound sources, but those concepts caused many equipment troubles. It is impossible to select type of the measurements signal for this kind of sound sources, also any sparks and laser beams can provide strong electromagnetic distortions around the operation zone. In current state of art we are trying to provide non-standard solutions while traditional omnidirectional sound source, based on spatial configuration of electroacoustic transducers, is not described correctly and can be expanded. Paper presents concept of acoustic monopole source based on coupled configuration for electrodynamic loudspeakers, similar to isobaric setup but non-constant volume between the speakers. By using FEM modelling we will present directivity patterns and project ideas, describing how overall results corresponds with geometrical parameters of speaker configuration and parameters. Presentation summary contain results of prototype device directivity patterns measurements. Received characteristics shows big potential in using cone-to-cone coupled speaker setup to reach acoustic monopole in frequency range defined by distance between transducers. Achieved knowledge allows to provide broadband, easy to build and small acoustic monopole with many possible applications.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-6
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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