Tech Area / Field

• CHE-RAD: Chemistry / Photo and Radiation Chemistry
• PHY-PFA: Physics / Particles, Fields and Accelerator Physics

Brief Description of Technology
The technology of polymeric track membranes was developed at FLNR JINR. The technology comprises irradiation of thin polymer foils by accelerated heavy ions, sensitization and chemical treatment resulting in formation of uniform micro- or nanopores in the polymeric matrix. The pores are straight cylindrical channels with the precisely defined diameter. The surface pore density is also precisely pre-determined by irradiation conditions. Special etching procedures provide manufacturing of pore channels as small as 15-50 nm. The pore shape can be also changed at will.

Some monomers can be grafted onto track membranes with the aim to modify the membrane properties. A series of hydrophilic polymers were attached to the polyester and polypropylene track membrane surfaces which improved the wettability of the membranes.

The grafting of thermosensitive hydrogels allows us to synthesize the membranes which show temperature-dependent and temperature-controlled permeation properties. N-isopropyl acrylamide was grafted to polyester track membranes with relatively large (~1 mm) pores. The membranes exhibit the permeability which changes drastically at the hydrogel transition temperature.

The grafing of hydrogels to small-pore membranes will provide manufacturing of membranes with a very rapid response to temperature or pH.

Legal Aspects
There is a series of Russian patents concerning the methods of production of polyester and polypropylene track membranes with pre-determined porous structure.

Special Facilities in Use and Their Specifications
The irradiation of polymer foils is carried out on the U-400 cyclotron of FLNR JINR. It provides a unique possibilty of performing homogeneous treatment of large sample areas. The accelerated Kr and Xe ions with the energies of 4-6 MeV/amu are available.

Scientific Papers
Apel P.Yu. Polymeric materials research with cyclotrons // In: Proc. XIV Intern. Conf. on Cyclotrons and Their Applications. Cape Town, South Africa, 8-13 Oct. 1995 (Ed. J.C.Cornell), World Scientific, Singapore. 1996. P.136-143.

Oganessian Yu.Ts., Apel P.Yu., Didyk A.Yu., Dmitriev S.N., G.G.Gulbekian. Applied Research with Cyclotron Beams at FLNR JINR. In: Proc. 7th Intern. Symp. on Advanced Nucl. Energy Research (Takasaki, Gunma, Japan, March 18-20, 1996) p.197-200.

Rostovtseva T.K., Bashford C.L., Alder G.M., Hill G.H., McGiffert C., Apel P.Yu., Lowe G., Pasternak C.A. Diffusion through narrow pores: movement of ions, water and nonelectrolytes through track-etched PETP membranes // J. Membrane Sci. 1996. V.151, P.29-43.

Дата добавления: 2015-07-20