Wyniki wyszukiwania - Biblioteka Nauki

1

Integracja nauki, doradztwa i praktyki - tematem konferencji w Radzikowie

100%

Malicka A.

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tom 43

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nr 1-2

22

2

The effect of kaolin modification of silane coupling agents on the properties of the polyethylene composites

51%

Domka L. , Malicka A. , Stachowiak N.

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tom Vol. 10, nr 2

5-10

EN

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.

3

Otrzymywanie i analiza fizykochemiczna krzemianów warstwowych modyfikowanych związkami proadhezyjnymi z grupy silanów

51%

Kozak M. , Domka L. , Malicka A.

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tom T. 85, nr 8-9

844-846

PL

W ramach prezentowanych badań zmodyfikowano naturalny bentonit sodowy (Specjal) oraz syntetyczny montmorylonit sodowy przy pomocy środków proadhezyjnych z grupy silanów (3chloropropylotrimetoksysilan, 3-metakryloksypropylotrimetoksysilan). Stopień modyfikacji powierzchni określono przy pomocy dyfrakcji promieniowania rentgenowskiego (XRD) oraz analizy termicznej (TG, DTG). W badaniach XRD zaobserwowano niewielkie zmiany profili dyfrakcyjnych, natomiast na termogramach DTG zmodyfikowanych silanami glinokrzemianów zaobserwowano w temp. 400–420°C maksima odpowiadające rozkładowi czynnika proadhezyjnego. Przy pomocy skaningowej mikroskopii elektronowej (SEM) scharakteryzowano również morfologię cząstek przed i po modyfikacji.

EN

Natural Na bentonite contg. 65% montmorillonite and synthetic Na montmorillonite were mixed 2 hrs. in aq. 50% EtOH with 2 wt. parts of 3-chloropropyl (I) or 3-methacryloxypropyl trimethoxysilane (II). The av. particle size of modified montmorillonite was 10–15 ìm vs. the 10 in the original. The II-modified bentonite had particles up to 60 ìm. The interlayer distance in Na montmorillonite was changed by I only slightly, 1.244 vs. 1.265 nm, and likewise in bentonite, regardless of the coupler type. Up to 1000°C, wt. loss was 1%. In I- or II-modified montmorillonite, the loss was 2.8 and 4.7% and the DTG peaks at 390–460 and 345–465°C, resp., were attributed to the decompg. silanes. Only the silane surface was affected and penetration of silane mols. into the interlayer space was insignificant.

4

Eksperymentalne metody wyznaczania tzw. pól martwych w ślimaku ucha wewnętrznego

51%

Skrodzka E. , Malicka A. , Sęk A.

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tom Vol. 83, nr 27

97-102

EN

Hearing impairment is often associated with damage to the hair cells in the cochlea. Complete loss of inner hair cells over a certain region of the cochlea is called a "dead region". This region can be defined in terms of the range of characteristic frequencies of the inner hair cells and/or neurons immediately adjacent to the dead region. It is difficult to diagnose dead regions taking into account audiograms only. Up to now two different methods of dead regions diagnosis have been developed: measurements of psychophysical tuning curves (PTCs) (time consuming but very accurate) and the threshold-equalising noise (TEN) method (fast but sometimes giving ambiguous results). A third method, which measures PTCs by means of a noise band whose central frequency changes gradually over a certain region, is proposed in this paper. The method is a compromise between PTCs and TEN method. The method is as fast as the TEN method is and is almost as accurate as PTCs.

5

Investigations of hydroxyapatite crystals in oral care products using the TEM method

45%

Pajchel Ł. , Malicka A. , Pajchel A. , German R. , Kolodzijski W.

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tom Vol. 21, no. 148

42