Abstract: The invention provides methods for purifying caustic feed streams using membranes that comprise polysulfonamide matrices.

Abstract: Membranes as well as a methods of treating membranes are disclosed. The method of treating a membrane includes contacting the membrane with a first solvent, contacting the membrane with an inert solvent, and contacting the membrane with an amine reactive compound. The first solvent includes a solvent having a Hansen solubility parameter in a range from about 10.0 to about 18. The membrane includes a polymer having an amine group.

Abstract: The invention provides a method for modifying the surface of a solid material (e.g. a polymeric matrix). The method is versatile and can be used to prepare polymeric matrices having altered, improved, or specifically engineered properties. Additionally, the method can be used to prepare polymeric matrices that have reactive groups that can be used to immobilize upon the matrices a variety of other “ligand” groups, e.g. a bio-selective affinity group, a chromophore, a dye, an amphiphile, a chiral group, a peptide, a protein, an antibody, an amino acid, an ion exchange group, a detectable group, a carbohydrate, a nucleic acid, a catalyst, a substrate for enzyme binding thereto, an enzyme inhibitor or enzyme co-factor for enzyme binding, or the like.

Abstract: The invention provides porous matrices that comprise one or more surfactants that can be used in non-aqueous environments.