Autor: Domka, L. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Structural Study of Polyethylene/Montmorillonite Systems
Autorzy:: Malicka, A.
Domka, L.
Powiązania:: https://bibliotekanauki.pl/articles/1812253.pdf
Data publikacji:: 2008-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.23.Pq
63.22.Np
68.37.Hk
81.05.Qk
Opis:: The effect of modification of montmorillonite (with 3-aminopropyltrimethoxysilane or hexadecyltrimethylammonium chloride) on the mechanical properties of the composites based on HDPE Hostalen ACP 5831 with the modified montmorillonite as filler, was studied. The structures of the fillers and nanocomposites were characterised by the scanning electron microscopy and X-ray diffraction study. The effect of the filler modification on the mechanical parameters of the nanocomposites and their structure was assessed on the basis of determination of the mechanical resistance, elongation at maximum tearing stress, bending strength, deformation at the maximum force and elasticity modulus on bending (three-point bending strength).
Źródło:: Acta Physica Polonica A; 2008, 114, 2; 423-431
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Production and Structural Investigation of Polyethylene Composites with Modified Kaolin
Autorzy:: Domka, L.
Malicka, A.
Stachowiak, N.
Powiązania:: https://bibliotekanauki.pl/articles/1812252.pdf
Data publikacji:: 2008-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.25.-g
63.22.Np
68.37.Hk
81.07.Pr
82.35.Np
Opis:: The study was undertaken to evaluate the effect of the filler (kaolin) modification with silane coupling agents on the properties of the polyethylene (HDPE Hostalen ACP 5831) composites. Powder mineral fillers are added to polymers to modify the properties of the latter and to reduce the cost of their production. A very important factor is the filler dispersion in the polymer matrix. Kaolin modified with 3-methacryloxypropyltrimethoxysilane and pure kaolin were characterised by surface area, pore size, water absorbing capacity, paraffin oil absorbing capacity, bulk density, scanning electron microscopy observations and X-ray diffraction measurements. Their performance was characterised by determination of the mechanical resistance upon static stretching and tearing, and their structure was observed in scanning electron microscopy images. The results were compared to those obtained for the composites with unmodified filler and pure HDPE.
Źródło:: Acta Physica Polonica A; 2008, 114, 2; 413-421
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Badania azbestu i materiałów zawierających azbest w obecności fosforytów ze złóż Syrii i Tunezji
Investigations of asbestos and materials containing asbestos in the presence of phosphorites from deposits in Syria and Tunisia
Autorzy:: Domka, L.
Jałoszyńska, M.
Kozak, A.
Powiązania:: https://bibliotekanauki.pl/articles/1826060.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: azbest
zagrożenia środowiskowe
Opis:: Asbestos (from the Greek word asbestos) means indestructable, inextinguishable. This is trade name regarding group of six minerals with fibrous structure, resistant to acids and bases, fire-proof, not conducting heat and electricity. These are hydrated silicates belonging to two groups of minerals: serpentinites and amphiboles. Minerals from group of serpentinites are characterized by chain structure where n of anions [SiO3] are repeated through the whole crystal along the single chain in the direction of the axis. Minerals from the group of amphibole have the ribbon type of structure, forming in the result of silica - oxygenic tetrahedrons chains overlapping. These chains are bound between themselves with bonds of interpolated cations. Sodium, magnesium, iron and calcium belong to main cations contained in amphiboles. Initially asbestos was treated as the harmless substance. Only in eighties and nineties of XX century suitable services took concrete position in the matter of harmfulness of asbestos on human health and natural environment. Investigations proving above every doubt harmfulness of asbestos filaments on human health were carried out in early seventies of the last century. Since then process of withdrawing asbestos from production has started and arduous and expensive process of removing materials containing asbestos. Samples of asbestos together with phosphorite were irradiated by microwave field of 80 W of power and then melted in muffle stove for 2 hour in the temperature 1000oC in the presence of KHSO4 as the flux, in the carried out investigations. Second series of samples (mixture of asbestos and phosphorite) was subjected to only microwave field of 80 W of power. Results of both series were followed in scanning electron microscope SEM and on the basis of derivatographic and X-ray analysis results. In both cases, when samples underwent one cycle of microwaves and ten cycles of microwaves one can see the clear change of the sample structure in the SEM photographs. In both cases fibers of asbestos melted into one piece (photo 2 and 3). Photo 3 of sample subjected to ten cycles of microwaves shows change of the sample structure from fibrous to amorphous additionally, which is devoid of carcinogenic properties
Źródło:: Rocznik Ochrona Środowiska; 2007, Tom 9; 345-358
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The effect of kaolin modification of silane coupling agents on the properties of the polyethylene composites
Autorzy:: Domka, L.
Malicka, A.
Stachowiak, N.
Powiązania:: https://bibliotekanauki.pl/articles/779702.pdf
Data publikacji:: 2008
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: kompozyty kaolin/HDPE
napełniacze modyfikowane
silanowe środki sprzęgające
kaolin/HDPE composites
modified fillers
silane coupling agents
Opis:: This paper shows the results of using the modified kaolin by silane coupling agents in HDPE composite and the effect of surface modifications of fillers on the properties of polyethylene composites. In the first stage pure and modified kaolin was subjected to a number of tests in order to determine the backfill density, water and paraffin oil absorbability, the surface area and pore volume, the morphology of their grains, thermal analysis and the FT-IR spectroscopy. In the second stage the composites, which were moulded into the samples that could be subjected to further tests, were produced. The samples were characterised by the determination of the hardness according to Shore, the elasticity modulus, the tensile strength and tearing strength. The modification of the kaolin surface has resulted in a substantial improvement of the strength parameters of the obtained polyethylene composites.
Źródło:: Polish Journal of Chemical Technology; 2008, 10, 2; 5-10
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Infrared Spectroscopic Identification of Chosen Dental Materials and Natural Teeth
Autorzy:: Hędzelek, W.
Marcinkowska, A.
Domka, L.
Wachowiak, R.
Powiązania:: https://bibliotekanauki.pl/articles/1812261.pdf
Data publikacji:: 2008-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 82.80.Gk
33.20.Ea
87.15.B-
87.85.J-
Opis:: Studies using solid phase infrared spectroscopy in the range of 400 to 4000 wave numbers were conducted in order to quickly identify solid tooth fragments and differentiate them from dental materials used in the dental practice. The frequently employed dental materials were evaluated. Natural chemical structure of permanent teeth obtained from donors of various ages provided the reference material. The infrared vibrations detected in infrared transmission spectra depended on the chemical structure of examined compound. Comparable distinctive peaks in infrared spectra of natural teeth and inorganic dental materials (porcelain) were exhibited. Analogous infrared spectra of dental materials consisting of organic matrix with inorganic fillers were found. In the case of acrylic materials specific organic groups were enhanced. The prepared database of infrared transmission spectra included 23 dental materials, facilitating their appropriate identification. Application of infrared spectroscopy allowed for a quick differential identification of typical dental materials produced from organic compounds for inorganic restorations (porcelain) and of tooth structure-resembling hydroxyapatite and its contaminate forms with fluoride and carbonate ions.
Źródło:: Acta Physica Polonica A; 2008, 114, 2; 471-484
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Mechanical Characterisation of Modified Aramid Fibres Used in Dentistry
Autorzy:: Malicka-Soczka, A.
Domka, L.
Gajdus, P.
Hędzelek, W.
Powiązania:: https://bibliotekanauki.pl/articles/1810276.pdf
Data publikacji:: 2009-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.20.-x
68.37.Hk
61.41.+e
Opis:: Reconstructive phase of medical treatment, especially in dentistry, requires the use of different polymers. A common laboratory method to increase the fracture resistance of acrylic resin dentures is to include high-resistance synthetic fibres in the processing protocol. However, in the case of aramid fibres the problem of ensuring high durability of bonding between the fibre and acrylic resin has not been solved yet. The aim of the study is to evaluate the mechanical properties and microstructure of acrylic resin reinforced with modified aramid fibres used as fillers or as fibres treated with epoxy resin. In this study mechanical strength of 10 samples of aramid fibres Kevlar (DuPont) and 10 samples of acrylic resin ProBase (Ivoclar) was determined. The controls were unreinforced samples. The three point loading tests were carried out on a universal testing machine Hounsfield. The structures of the fillers and composites were characterised by the scanning electron microscopy. The results are presented graphically in diagrams and table.
Źródło:: Acta Physica Polonica A; 2009, 115, 2; 599-601
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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