[en] Short communication

[en] Short communication. 2 refs, 1 fig

[en] Short communication. 6 refs, 3 figs

[en] The materials of the 3rd conference on Particle Track Membranes and Theirs Applications present actual state of art in the topic. The leading world institutions have presented their works on the technology of PTM production by interaction of ion beams with polymeric foils. The broad spectrum of PTM membranes have been shown, their properties have been described and their applicability discussed. A number of possible applications of PTM and also already realized in industry, medicine, biology and physical investigations have been presented. 29 lectures have been made in the course of conference

[en] First results of new electrolytic conductivity cell are reported concerning the initial stage of the pore opening process during track etching in vitreous solids. On the basis of the soft mode (low energy excitation) model for track etching, a distribution function for the number of performed micropores as function of time is calculated, by accounting for the radial etch rate as function of the effective pore radius. (author). 7 refs, 7 figs

[en] The problems of producing track membranes on heavy ion beams of the Flerov Laboratory are considered. The parameters of the running accelerators and equipment for the irradiation of polymer foils are presented. The process of production of track membranes based on different polymeric materials and various applications of the membranes are described. Special attention is given to the principally new applications and devices developed at the Laboratory. This report presents the results obtained by a big group of scientists and engineers working in the field of elaboration, investigation and application of track membranes (author). 21 refs, 20 figs, 1 tab

[en] The thermal stability of heavy ion latent tracks in polyimides in the temperature range of 100 C to 300 C and the temperature effect during the irradiation in temperature interval of -180 C to 20 C are investigated. The chemical etching of the latent tracks was carried out in H₂SO₄ solutions containing potassium bi-chromate or in NaOCl (8% Cl) solution. Experimental results showed that tracks in polyimides are resistant to high temperatures and the track formation is scarcely affected by the temperature during irradiation. (author). 3 refs, 3 figs, 1 tab

[en] The sample of commercial PETP (Hostaphan) and very heavy ions irradiated products were investigated by differential scanning calorimetry in nitrogen flow. Irradiation were performed with Dy ions of 13 MeV/u with fluences 5 x 10¹⁰ ions/cm². Differences were observed in melting behaviour of unirradiated and irradiated foils. The influence of irradiation conditions on the results was noticed. Moreover the samples of polyimide (Kapton) and polycarbonate (Macrofol) irradiated in similar conditions were examined by DSC. The DSC traces have been compared with those of unirradiated reference samples. (author). 8 refs, 5 figs

[en] The processes of high-energy ions etching in polyimide (PI) were studied. Comparison between characteristics of etchant with various compositions was made. A new etchant (concentrated hydrogen peroxide) with high selectivity and high etching rate was suggested. The etchant is accessible and ecologically clean. PI track membranes for ultra- and micro-filtration were created. (author). 12 refs, 1 fig., 2 tabs

[en] The results of investigations of pores formation process in polyimide films after their irradiation by argon, krypton and wolfram high energy ions with the further treatment in concentrated hydrogen peroxide are presented. The size of the destruction zone and the zone of formation of a changed polymer structure as well as chemical resistance increasing are defined. The rate of etching of polymer along tracks and etching selectivity are determined. A method of preparing the polyimide track membranes with cylindrical or conic forms of pores is shown. (author). 14 refs, 5 figs, 1 tab