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Determination of Polyolefine Based Composites Nanostructure Parameters by Very Cold Neutrons Scattering

100%
Kuznetsov S., Dubnikova I., Litvin V., Meshkov I., Shelagin A., Udovenko A.
Acta Physica Polonica A
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2010
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vol. 117
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issue 5
727-732
EN
Very cold neutrons (VCN) scattering method was used to study the morphology of polyolefine based nanocomposites. The nanocomposites were prepared by the melt mixing method. The special surface active additions and the fillers surface modification were used to improve the polymer-filler compatibility. The multiwalled carbon nanotubes (MWCNT), the calcium carbonate (CC) submicron particles and the layered natural mineral montmorillonite (MMT) nanoparticles were used as the fillers. The fractal structural model was used to describe the VCN scattering on the nanofillers agglomerates. It was shown by VCN scattering that the volume part of isolated MWCNTs in polypropylene (PP) based composites decreases with the increase of the filler loading, the density of MWCNT packing in agglomerates increases with the total volume nanotube concentration and decreases with the nanotube surface modification. It was revealed that the isolated CC particles are dominated in the CC/PP samples with low CC (5 vol.%) loading. It was shown that practically full MMT exfoliation within polyethylene (PE) matrix can be achieved by both polymerization exfoliation method and by melt mixing compounding with using special polar polymer additions.
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Slow Positron Beam Studies of the Stainless Steel Surface Exposed to Sandblasting

68%
Horodek P., Dryzek J., Kobets A., Kulik M., Lokhmatov V., Meshkov I., Orlov O., Pavlov V., Rudakov A., Sidorin A., Siemek K.
Acta Physica Polonica A
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2014
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vol. 125
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issue 3
714-717
EN
The paper presents slow positron beam studies of the stainless steel grade 304 AISI samples annealed in the flow N_2 atmosphere and sandblasted under different pressure from 1 to 7 bar. Heating of specimens caused formation of an additional layer on the surface which can be identified as oxides. Sandblasting reduces the thickness of the oxide layer and also defects concentration (vacancies as we suppose) decreases in dependence on pressure applied during blasting. Additionally, the atomic concentrations of oxygen have been obtained using nuclear methods (Rutherford backscattering and nuclear reactions) in the near surface layers of the studied samples.
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