Wet chemical modification

We have developed a variety of different polymers for the wet chemical coating of membranes. These polymers are thermally or photo-chemically cross-linkable and therefore the resulting coatings are long term stable. The properties are ranging from hydrophilic to hydrophobic and also functional groups (e.g. amines) can be introduced which are good starting points for a further chemical modification.

We have the infrastructure to make continuous roll-to-roll coatings both for hollow fiber and flat membranes. By controlling the wetting of the membranes it is possible to control whether the coating is on the surface of the membrane or inside the pores. In addition, there are coating systems available which are also suitable for a coating inside hollow fibers. Besides the coating with polymers other technologies, like interfacial polymerization or grafting-from are also available. Doing so thin film composite membranes are available with favorable properties for forward osmosis applications.

Our research

Dense metal membranes for hydrogen purification

Membranes for the separation of hydrogen from other gases.

Supported ionic liquid membranes

Due to their unique chemical and thermal properties ionic liquids are used as absorbers and in supported liquid membranes for the separation of gases, like CO2.

Membranes for humidification

Membranes for humidification or dehumification applications, for the dehydration of gases and for air conditioning of buildings.

Reference projects

MAVO MEGA – Functional membranes for save and energy efficient gas separation


So far, the industrial use of technical separation membranes has been largely set to liquid filtration and less to gas separation. In the MEGA project, mixed‑matrix membranes were developed at the Fraunhofer IGB in cooperation with three other Fraunhofer institutes, which have great potential for gas separation due to their improved separation properties compared to pure polymer coatings.