| 摘要 |
Composite membranes comprising a layer having first and second microporous surfaces and a bulk between the surfaces, the bulk comprising a first set of pores having outer rims, and a second set of pores connecting the rims, and a polymer matrix supporting the first set of pores; and, a second layer having first and second porous surfaces and a second bulk between the porous surfaces, wherein the second bulk comprises a fibrous matrix; or, first and second microporous surfaces and a second bulk between the microporous surfaces, the second bulk comprising: a third set of pores having outer rims and a fourth set of pores connecting the rims, and a polymer matrix supporting the third set of pores; a third set of pores prepared by phase inversion; or, a fibrous matrix; or, a third set of pores prepared by stretching, track etching or e-beam, are disclosed. |
| 主权项 |
1. A composite microporous membrane comprising
(A) a first layer having
(i) a first microporous surface;(ii) a second microporous surface; and,(iii) a first porous bulk between the first microporous surface and the second microporous surface of the first layer, wherein the first porous bulk comprises 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 first polymer matrix supporting the first set of pores, wherein the first controlled pore size is greater than the second controlled pore size; and, (B) a second layer having
(i) a first porous surface;(ii) a second porous surface; and,(iii) a second porous bulk between the first porous surface and the second porous surface of the second layer, wherein the second porous bulk comprises a fibrous matrix;or(iv) a first microporous surface;(v) a second microporous surface; and,(vi) a second porous bulk between the first microporous surface and the second microporous surface of the second layer, wherein the second porous bulk comprises:
(a) a third set of pores having outer rims, prepared by removing introduced dissolvable silica nanoparticles, the third set of pores having a third controlled pore size, and a fourth set of pores connecting the outer rims of the third set of pores, the fourth set of pores having a fourth controlled pore size, and a second polymer matrix supporting the third set of pores, wherein the third controlled pore size is greater than the fourth controlled pore size;(b) a third set of pores prepared by phase inversion, the third set of pores having a third controlled pore size; or(c) a fibrous matrix; or,(d) a third set of pores prepared by stretching or track etching or e-beam, the third set of pores having a third controlled pore size. |
