No abstract available

[en] The registration properties of PTFE-E (F-40, Russia; Tefzel, DuPont, USA; Hostaflon ET, Germany) having exceptional chemical and thermal (about 300 deg. C) resistance are considered. The polymer samples were irradiated with ions in a wide region of masses (from O up to Xe) and energies (from 1 to 6 MeV/amu). Alkaline KMnO₄ solutions at ∼100 deg. C were used for etching. It is shown that the polymer registration properties depend on the hydrogen content in the polymer. For a copolymer with 2-3 wt% of hydrogen the registration threshold is about 8 MeV cm²/mg. The ion tracks were not found after chemical etching for a copolymer with 1 wt% of hydrogen. Track membranes were produced and examined

[en] The brief description of the polypropylene nuclear track membranes is given. The membranes are obtained from biaxially oriented polypropylene films 10μm thick by means of irradiation with accelerated heavy ions and following chemical etching. The data on pore shape, pore size dispersion, the permeability of membranes and on the content of impurities in membrane matrix are given. It is noted that the polypropylene membranes can be used for cleaning and analysis of agressive chemical species. 9 refs.; 2 figs

[en] The results of the graft polymerization of methacrylic acid into perfluoropolymers (the copolymer of tetrafluoroethylene with hexafluoropropylene, copolymer of tetrafluoroethylene with perfluoroallylether) irradiated with heavy ions (Kr, 430 MeV) are presented. It has been found that the graft polymer quantity depends upon the polymer nature and the ion fluence. The graft polymer amount and its penetration depth were measured by the weighting methods, the dye sorption and electron microscopy methods. The graft polymerization results in significant changes in the polymer volume and structure

[en] The possibilities of application of light ions ⁴⁰Ar, ²²Ne, ¹¹B with energies 46, 27 and 136 MeV, respectively, have been examined for nuclear track membranes production. The polyvinylidene fluoride foil has been used as an irradiated material. The track etching rates and diameter dispersions of pore holes have been compared with those obtained by the use of ¹²⁹Xe ions

[en] Parameters of electromigration separation of cesium and sodium ions by means of nuclear membranes are experimentally determined. Separation was carried out in aqueous solutions of acetates of these metals (counter-current was carried out by the acetic acid solution) and it was controlled radiometrically using radioactive tracers ¹³⁷Cs,²²Na. Possibility in principle to realise the effect of counterflow electromigration separation of cesium and sodium ions at the 10μm height of a separation layer is shown. The structure of nuclear mambranes provides the homogeneity of the solution flow along the whole cross section of a separation cell, and, as a result, HETP approximates practically to a theoretically possible value

[en] The microgalvanic method for metal filling of etched ion tracks in organic foils is of particular interest for the fabrication of microsized structures. Microstructures like copper whiskers with a high aspect ratio produced in ion track membranes are suitable for the generation of high-performance heat transfer surfaces. A surface with good heat transfer characteristics is defined as a surface on which a small temperature difference causes a large heat transfer from the surface material to the liquid. It is well-known that a porous surface layer transfers to an evaporating liquid a given quantity of heat at a smaller temperature difference than does a usual smooth surface. Copper whiskers with high aspect ratio and a density 10⁵ per cm² form such a porous structure, which produces strong capillary forces and therefore a maximum of heat transfer coefficients

[en] The sensitivity and regularities of the chemical etching of the charge heavy particle detectors made of polyvinylidenfluoride (PVF) exposed to UV light and gamma-radiation have been investigated. (author)

No abstract available

[en] For preparing track membranes on the basis of perfluorinated polymer materials the potentiality of using the method of methacrylic acid graft polymerization to the range of heavy accelerated ions tracks for forming local defect regions fit for etching is studied. Films of polyhexafluropropylene and polyperfluoroallyl ether were irradiated by 430 MeV Kr ions at the ions fluence 10⁸-10¹² ion/cm². Polymerization kinetics was analyzed. Methods permitting an essential increase in the yield of the grafted polymer and realization of graft polymerization in the volume of the whole track were developed