Porous polymer material and process for production thereof

摘要

PCT No. PCT/RU92/00023 Sec. 371 Date Jan. 10, 1994 Sec. 102(e) Date Jan. 10, 1994 PCT Filed Jan. 31, 1992 PCT Pub. No. WO93/21263 PCT Pub. Date Oct. 28, 1993.The material contains interrelated micro- and anisodiametric macropores which latter are disposed mainly on peripheral portions. The volume ratio of micro- and macropores is 1:3-7. The process involves freezing a polymer dispersion at a temperature ensuring a 3-11:1 ratio of dispersed phase to the noncrystallized dispersion medium, seasoning the conjugate-dispersed system at a temperature and within a time sufficient for reversal of phases, followed by thawing. The used polymer dispersion contains a liquid crystallizable dispersion medium and a polymer phase capable of autohesion at temperatures below the initial melting temperature of crystals in the dispersion medium.