A method for preparing a highly porous, high surface area degradable or
partially degradable material. The method comprises the steps of mixing a
degradable or partially degradable polymer with a mixed solvent
comprising a first solvent and a second solvent, wherein the mixed
solvent comprises a ratio higher than 1:1, first solvent to second
solvent; gelling the mixture; and treating the gel under conditions
whereby a substantially solvent free porous structure is created having a
porosity greater than about 80%; wherein the material is mechanically
strong and has a complex porous structure with nano fibrous architecture.