POROUS POLYMERIC MEMBRANE WITH HIGH VOID VOLUME

摘要

Microporous membranes comprising a single integral layer having first and second microporous surfaces; and, a porous bulk between the microporous surfaces, wherein the bulk comprises at least a first region and a second region; the first region comprising a first set of pores having outer rims, prepared by removing introduced silica dissolvable nanoparticles, the first set of pores having a first controlled pore size, and a second set of pores connecting the outer rims, the second set of pores having a second controlled pore size, and a polymer matrix supporting the first set of pores, wherein the first controlled pore size is greater than the second controlled pore size; the second region comprising a third set of pores prepared by phase inversion, the third set of pores having a third controlled pore size, filters including the membranes, and methods of making and using the membranes, are disclosed.

主权项

1. A microporous membrane comprising
(A) a single integral layer having
(i) a first microporous surface;(ii) a second microporous surface; and,(iii) a porous bulk between the first microporous surface and the second microporous surface, wherein the bulk comprises at least a first region and a second region;
(a) the first region comprising a first set of pores having outer rims, prepared by removing introduced dissolvable silica nanoparticles, the first set of pores having a first controlled pore size, and a second set of pores connecting the outer rims of the first set of pores, the second set of pores having a second controlled pore size, and a polymer matrix supporting the first set of pores, wherein the first controlled pore size is greater than the second controlled pore size;(b) the second region comprising a third set of pores prepared by phase inversion, the third set of pores having a third controlled pore size wherein the third controlled pore size is at least about 10% less than, or at least about 10% greater than, the first controlled pore size.