Filled polymeric membranes, use and method of manufacturing

A filled polymeric membrane for separating a mixture of fluids, the membrane comprising:

• a glassy polymer having a glass transition temperature of at least 100° C.;
• and nanometer-sized filler particles, wherein said filler particles are arranged in aggregates, the aggregates having an average aggregate size of at least 50 nm and smaller than 200 nm, wherein between 51% and 90% of the aggregates have a size smaller than 200nm.

A filled polymeric membrane for separating a mixture of fluids, the membrane comprising:

• a glassy polymer having a glass transition temperature of at least 100° C.;
• and nanometer-sized filler particles, wherein said filler particles are arranged in aggregates, the aggregates having an average aggregate size of at least 50 nm and smaller than 200 nm, wherein between 10% and 40% of the aggregates have a size smaller than 100 nm, between 20% and 75% of the aggregates have a size between 100 nm and 200 nm and between 0% and 49% of the aggregates have a size larger than 200nm.