Thin film composite membranes on polyolefin structures may be prepared by
interfacial polymerization on a polyolefin support. Polyolefin structures
may have hollow and/or solid portions. The polyolefin structure may be
hydrophilized prior to interfacial polymerization. The hydrophilized
structure may also be treated with an aqueous monomer containing solution
first, followed by the organic monomer containing solution.
Alternatively, an organic monomer solution may be introduced first,
followed by the aqueous monomer containing solution when treating a
hydrophilized structure. The formed membrane may possess advantageous
characteristics, including stability, hydrophilicity, predetermined pore
sizes and/or solvent resistance.