Wyniki wyszukiwania - BazTech

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Badania wpływu temperatury i wilgotności na rezystywność powierzchniową materiałów kompozytowych ekranujących pole elektromagnetyczne

Ziaja J., Krawczyk K.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 7

321--323

PL

W pracy przedstawiono wyniki badań wpływu temperatury i wilgotności na rezystywność powierzchniową kompozytów złożonych z włókniny polipropylenowej, z naniesionymi warstwami metalicznymi otrzymanymi metodą impulsowego rozpylania magnetronowego targetów cynkowo-indowych (80%Zn-20%In) oraz tytanowych. Kompozyty starzono w temperaturach 23 i 40 °C, a wilgotność względną otaczającego powietrza zmieniano od 20 % do 90 %. Badania wykazały silny wpływ temperatury i wilgotności. Stwierdzono również małą odporność starzeniową warstw cynkowo-indowych.

EN

Authors describe research over influence of temperature and humidity on the surface resistivity of composites made of polypropylene nonwoven fabric coated with pulls magnetron sputtering method with targets made of zinc-indium (80%Zn-20%In) and titanium. These materials were aged in two temperatures 23 C and 40 °C, and relative humidity of surrounding air was changed from 20 % to 90 %. It was found also that temperature has significant influence on the value of surface resistivity of composite material with 80%Zn-20%In layer. Research revealed low ageing resistance of zinc-indium layer.

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Barrier properties of hydrogenated acrylonitrile-butadiene rubber composites containing modified layered aluminosilicates

Krzemińska S., Rzymski W. M.

Materials Science Poland

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2011

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Vol. 29, No. 4

285--291

EN

The resistance to permeation by the selected solvents of flat membranes made of cured hydrogenated acrylonitrile-butadiene rubber (HNBR) materials without any fillers and containing 5 phr of layered aluminosilicate nanofiller (bentonite), modified with various types of ammonium salts or N330 type carbon black, was investigated. The barrier properties were assessed on the basis of the breakthrough time of a liquid with low (cyclohexane) or average (butyl acetate) thermodynamic affinity to HNBR, determined according to EN 6529:2001, through a cured elastomer sample. The addition of bentonite, irrespectively of the method of modification of its particles, was found to increase the cured HNBR breakthrough time by 20 - 35 % in the case of slowly permeating non-polar cyclohexane, and by 50 - 130 % in the case of polar butyl acetate permeating more rapidly, in comparison with the barrier material containing no filler. The layered aluminosilicate nanofillers increased the breakthrough time of the material sample for both the tested solvents. In particular, the breakthrough time for polar butyl acetate was even longer than for conventional carbon black. Additionally, the increase of the breakthrough time was observed to depend on the modifier of bentonite particle surface.

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Barrierity of Hydrogenated Butadiene-Acrylonitrile Rubber and Butyl Rubber After Exposure to Organic Solvents

Krzemińska S., Rzymski W. M.

International Journal of Occupational Safety and Ergonomics

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2011

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Vol. 17, No. 1

41--47

EN

Resistance of antichemical clothing primarily depends on the type of material it is made from, in particular on the type of polymer used for coating the fabric carrier. This paper reports on systematic investigations on the influence of the cross-linking density of an elastomer and the composition of a cross-linked elastomer on its resistance to permeation of selected organic solvents. Tests of barrier material samples made from nonpolar butyl rubber (IIR) and polar hydrogenated butadiene-acrylonitrile rubber (HNBR) showed that (a) in rubber–solvent systems with medium thermodynamic affinity, cross-linking density influenced resistance to permeation and (b) the polarity of the system had a significant influence on barrierity.