Temat: low-density polyethylene

Skocz do pozycji: 1.

Tytuł:: Assessment of the resistance to external factors of low-density polyethylene modified with natural fillers
Autorzy:: Głogowska, K.
Majewski, Ł.
Gajdoš, I.
Mitaľ, G.
Tematy:: natural filler
low-density polyethylene
injection molding; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102811.pdf Link otwiera się w nowym oknie
Opis:: The study reports the results of investigation of basic processing and thermal properties of low-density polyethylene modified with two types of natural filler: wheat bran and pumpkin seed hulls, their content ranging from 5% to 15% relative to the matrix. In addition, physical properties of the produced granulates are determined, i.e. the relationship between their density and the applied contents of the tested fillers. Furthermore, the study reports the results concerning longitudinal shrinkage, abrasion resistance and cold water absorption of injection molded tensile specimens.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of HNT Nano-Additives on the Hardness of Thermoplastic Composites
Autorzy:: Kiszka, Bogusław
Dulebová, Ľudmila
Martina, Dulebová
Wydawca:: Ústav technológií a manažmentu Strojnícka fakulta – Technická univerzita v Košiciach
Opis:: The European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie
Nanocomposites are a new class of composites that are particle- filled composites in which at least one dimension of the dispersed particles is in the nanometer range. One of the interesting aspects of the use of nanofillers is the low concentration of that filler that needs to be added to the polymer system to obtain desired property improvements. Nanocomposites based on low-density polyethylene (LDPE), containing 2,4 and 6wt% of Halloysite nanotubes (HNT) were used for experiments. The specimens were prepared by injection molding and were tested by Shore hardness test.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of HNT Nano - Additives on the Hardness of Thermoplastic Composites
Autorzy:: Kiszka, Bogusław
Dulebová, Ľudmila
Dulebová, Martina
Współwytwórcy:: Dulebová, Martina
Wydawca:: Technical University of Košice
Cytata wydawnicza:: L. Dulebová, B. Kiszka, M. Dulebová, Influence of HNT nano-additives on the hardness of thermoplastic composites, Transfer inovácií. 36, 22-25 (2017).
Opis:: Nanocomposites are a new class of composites that are particle-filled composites in which at least one dimension of the dispersed particles is in the nanometer range. One of the interesting aspects of the use of nanofillers is the low concentration of that filler that needs to be added to the polymer system to obtain desired property improvements. Nanocomposites based on low-density polyethylene (LDPE), containing 2, 4 and 6wt% of Halloysite nanotubes (HNT) were used for experiments. The specimens were prepared by injection molding and were tested by Shore hardness test.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 4.

Tytuł:: The influence of nanofillers on LDPE mechanical properties
Autorzy:: Dulebová, Ludmila
Sikora, Janusz
Kiszka, Bogusław
Greškovič, František
Wydawca:: Politechnika Lubelska
Opis:: Polymer nanocomposite has been known as one of the early success stories of realizing the potential of nanomaterial as reinforcement filler to improve the properties of neat polymers. By adding the nano sized organic compounds, the properties of polymers are improved. Properties of the produced nanocomposites depend on the inorganic materials present in the polymers matrix
European Union
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 5.

Tytuł:: Wybrane aspekty oznaczania gęstości polietylenu małej gęstości
Selected aspects of low-density polyethylene density measurements
Autorzy:: Liszyńska, B.
Zieliński, J.
Marszałek, G.
Kowalska, L.
Kościańczuk, D.
Tematy:: polietylen małej gęstości
polimery termoplastyczne
gęstość
low-density polyethylene
thermoplastic polymers
density; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Powiązania:: https://bibliotekanauki.pl/articles/278167.pdf Link otwiera się w nowym oknie
Opis:: Określono wpływ sposobu przygotowania próbek do oznaczeń na wartość gęstości polietylenu malej gęstości oraz podjęto próbę korelacji tych wielkości z wielkościami wyliczonymi na podstawie badań DSC. Przedmiot badań stanowiło osiem gatunków PE-LD. Gęstość oznaczano metodą zanurzeniową stosując próbki przygotowane w dwojaki sposób. Ustalono, że sposób kondycjonowania próbki ma widoczny, ale nieznaczny wpływ na wartość gęstości. Nie uzyskano zadowalającej korelacji pomiędzy wartościami gęstości oznaczonymi metodą zanurzeniową a wyliczonymi na podstawie DSC.
The influence was determined of the preparation of samples for the measurements on the density of low-density polyethylene and an attempt was made to correlate these values with density values calculated basing on DSC studies. The subject of this research were eight types of LDPE. The density was measured using immersion method for samples prepared in two ways. It was determined that the method of sample preparation has an observable but small influence on the measured value of density. No acceptable correlation was found between the values of density measured using the immersion method and the values calculated basing on DSC.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The Effect of Adding Nano-additives on the Properties of Thermoplastic Polymers
Autorzy:: Stanislav, Benco
Jaroslav, Hajek
Głogowska, Karolina
Wydawca:: Technical University of Košice
Opis:: Nanotechnology is a rapidly growing interdisciplinary field of knowledge, spanning many areas of research. Depending on its nature, the introduction of a nano-additive into the matrix is intended to give the composites certain mechanical, thermal, optical, surface or biological properties. Significant improvements in nanocomposite properties are mainly due to the shape and size of the nano-additive, the surface area, level of surface development, surface energy and spatial distribution of nanoparticles in the polymer matrix. The paper presents the results of research on basic processing and thermal properties, i.e. the mass flow rate index (MFR) and the Vicat softening temperature of low density polyethylene modified by carbon nanotubes with a mass share of up to 6% of the matrix. The paper is closed with appropriate conclusions.
European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 734205
Investigation and development of a new generation of machines for the processing of composite and nanocomposites materials
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 7.

Tytuł:: Properties of moldings prepared from LDPE-pumpkin seed hulls blend
Autorzy:: Głogowska, K.
Sikora, J.
Dulebova, L.
Tematy:: natural filler
low-density polyethylene
pumpkin seed hulls
injection molding; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102641.pdf Link otwiera się w nowym oknie
Opis:: In recent decades, standard polymer blends for different applications have been more and more often replaced by blends containing raw materials. The use of natural materials as filler in thermoplastics brings both economic and environmental benefits. The use of a given vegetable filler depends on the geographic location and natural occurrence of the vegetables in a given geographic region. In Poland, for instance, the pumpkin is one of such vegetables. They are used for producing oil which is pressed from pumpkin seeds. Pumpkin seeds are then collected, dried and purified to produce waste material in hull form. Particles of ground pumpkin seed hulls with varying sizes and weight-in-weight concentration ranging from 0% to 20% relative to the matrix are used as filler in low-density polyethylene. Pumpkin seed hulls are ground and sieved. Four fractions of hulls with different particle sizes are produced: <0.2 mm, 0.2-0.4 mm, 0.4-0.6 mm, 0.6-0.8 mm. The paper reports the results of investigation of the mechanical properties, i.e., strength properties determined by static tensile testing and hardness measurement, of injection molds produced at constant processing parameters. In addition, the cross sections of the obtained products are subjected to microscopic examination. Relationships are determined between tensile modulus, maximum tensile stress, tensile stress at yield, maximum tensile strain, tensile strain at yield as well as Shore hardness and weigh-in-weight concentration of the powdered natural filler and its grain sizes. Finally, relevant conclusions are drawn.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Influence of temperature on breakdown voltage of 10 MeV electron beam irradiated LDPE and HDPE
Autorzy:: Borhani, M.
Ziaie, F.
Bolorizadeh, M.
Mirjalili, G.
Tematy:: breakdown voltage
dielectric constant
temperature effect
electron beam
low-density polyethylene; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146157.pdf Link otwiera się w nowym oknie
Opis:: The paper presents measurements of the breakdown (dielectric strength) and dielectric constant of the low density polyethylene (LDPE) and high density polyethylene (HDPE) thin sheets, which were irradiated with a 10 MeV electron beam in the range of 0-470 kGy using a Rhodotron accelerator system. The tests were performed at temperatures ranging from 20°C to 110°C. Variation of the measured parameters vs. radiation absorbed dose and temperature were discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dose rate effect on LDPE cross-linking induced by electron beam irradiation
Autorzy:: Ziaie, F.
Anvari, F.
Ghaffari, M.
Borhani, M.
Tematy:: dose rate
electron beam
low-density polyethylene
cross-linking
chain scission; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148862.pdf Link otwiera się w nowym oknie
Opis:: In this project, the radiation induced cross-linking in low-density polyethylene (LDPE) samples irradiated with the different dose rates of 5 MeV electron beam in the dose range of 20 up to 200 kGy were investigated and compared. The dose rate values were ranged from 13 to 300 kGy/min. The cross-linking of the samples were studied on the basis of gel content measurement and a hot set test. The yield of gel content showed slight increases with decreasing dose rate values. The same results were more clearly observed using the hot set test. It was concluded that, to irradiate the product based on LDPE, any variation in electron beam current causes different dose rates which, in turn, affect the absorbed dose value in materials.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Polyethylene-Matrix Composites with Halloysite Nanotubes with Enhanced Physical/Thermal Properties
Autorzy:: Gajdoš, Ivan
Sikora, Janusz
Puszka, Andrzej
Wydawca:: MDPI
Cytata wydawnicza:: Sikora, J., Gajdos, I. & Puszka, A. (2019). Polyethylene-Matrix Composites with Halloysite Nanotubes with Enhanced Physical/Thermal Properties. Polymers. 11 (5), 787. 10.3390/polym11050787.
Opis:: European Union
The aim of the present work is to investigate the e ect of halloysite nanotubes (HNT) on the mechanical properties of low-density polyethylene composites modified by maleic anhydride-grafted PE (PE-graft-MA). Polyethylene nanocomposites were prepared using an injection molding machine, Arburg Allrounder 320 C 500–170; the HNT content was varied at 0 wt %, 2 wt %, 4 wt % and 6 wt %, and the PE-graft-MA content was varied at 5 wt %. The composites were examined for their ultimate tensile stress, strain at ultimate stress, hardness, impact strength, melt flow rate, heat deflection temperature, Vicat softening temperature, crystallinity degree and phase transition temperature. It was found that the addition of halloysite nanotubes to low-density polyethylene (LDPE) led to an increased heat deflection temperature (HDT, up to 47 C) and ultimate tensile strength (up to 16.00 MPa) while the Vicat softening temperature, strain at ultimate stress, impact strength and hardness of examined specimens slightly decreased. Processing properties of the materials specified by the melt flow rate (MFR) deteriorated almost twice. The results have demonstrated that the nanoparticles can reinforce enhance LDPE at low filler content without any considerable loss of its ductility, but only when halloysite nanotubes are superbly distributed in the polyethylene matrix.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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