Autor: Raszkowska-Kaczor, Aneta - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: Introduction to modelling the correlation between grain sizes of feed material and the structure and efficiency of the process of co-rotating twin-screw extrusion of non-flammable composites with a pla matrix
Autorzy:: Fiedurek, Kacper
Szroeder, Paweł
Macko, Marek
Raszkowska-Kaczor, Aneta
Borowicz, Marcin
Puszczykowska, Natalia
Powiązania:: https://bibliotekanauki.pl/articles/2204677.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: introduction to modelling
extrusion
parameters of the process
biodegradable polymers
polymers
flame retardancy
Opis:: Co-rotating twin-screw extrusion is an energy consuming process that is generally not fully optimised to a specific polymer. From the point of view of the efficiency of the extrusion process, the starting material should be characterised by small grain sizes in comparison to the screw channel area, small surface area to volume ratio and small internal friction between the pellets. To develop a model describing the effect of polylactide (PLA) grain size on the extrusion efficiency, a series of experiments with a twin-screw extruder were carried out during which the energy consumption; torque on shafts and temperature of the melt on the extruder die were monitored. As feed material, both the neat PLA with different grain sizes and the PLA with expandable graphite fillers and phosphorous-based flame retardants were used. Morphology and dispersion quality of the composites were examined using scanning electron microscopy (SEM); flammability, smoke production, mass loss and heat release rates were tested using cone calorimetry; and melt flow rate was determine using a plastometer. Moreover, the thermal properties of the obtained composites were determined using differential scanning calorimetry (DSC). The results show that the choice of the starting material affects both the efficiency of the extrusion process and the flame retardancy properties of the composite materials.
Źródło:: Acta Mechanica et Automatica; 2022, 16, 4; 301--308
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 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

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