Helmholtz-zentrum Hereon Gmbh

Helmholtz-zentrum Geesthacht Zentrum Fuer Material- Und Kuestenforschung Gmbh

Helmholtz-zentrum Geesthacht Zentrum Fur Material Und Kustenforschung Gmbh

Futurecarbon Gmbh

Volker Abetz

Klaus-Viktor Peinemann

Sergio De Traglia Amancio Filho

Joachim Koll

Meiling Wu

Nazia Noor

Ortrud Aschenbrenner

Kirti Sankhala

Sofia Rangou

Janina Hahn

Volkan Filiz

Ulrich Handge

Clarissa Abetz

Wiebke Sophie Junior

Juliana Isabel Clodt

Christian Otto

Brigitte Lademann

Peter F W Simon

Maryam Radjabian

Kristian Buhr

M Volkan Filiz

Greta Johannsen

Karl Schulte

Juliana Clodt

Marcio Rodrigo Loos

Jorge Fernandez Dos Santos

The present invention provides a coated hollow fiber membrane which has an isoporous inner skin and a porous outer support membrane, i.e. an inside-out isoporous composite hollow fiber membrane, and to a method of preparing such membranes. The coated hollow fiber membrane is prepared by a method comprising providing a hollow fiber support membrane having a lumen surrounded by the support membrane, and coating and the inner surface thereof by first passing a polymer solution of at least one amphiphilic block copolymer in a suitable solvent through the lumen of the hollow fiber support membrane and along the inner surface thereof, thereafter pressing a core gas stream through the lumen of the coated hollow fiber mebrane, and thereafter passing a non-solvent (precipitant) through the lumen of the coated hollow fiber membrane. In order to remove the solvent or solvents completely, the membranes are kept in water for 1-2 days and washed prior to use. In order to maintain the porosity of support membrane, membrane pretreatment is advantageous prior to coating which reduces the infiltration of block copolymer solution. The membranes are useful infiltration modules, in particular microfiltration modules, ultrafiltration modules, nano-filtration modules.

Method for preparing isoporous hollow fiber composite membranes

The present invention is directed towards a method for the preparation of macroporous or mesoporous polymer films in hollow fiber geometry. The method according to the present invention reliably produces macroporous or mesoporous homopolymer or copolymer films in hollow fiber geometry having an ordered porous structure. Preferably, the pores are isoporous. The method involves the purging or casting a polyol adjacent to a film forming polymer solution of at least one homopolymer or at least one copolymer in a suitable solvent while polyol diffuses in and then condenses out of the film forming solution before the solution is immersed into a coagulation bath. The methods also require the presence of a carrier solution or carrier substrate during spinning or casting. The method makes macroporous or mesoporous film formation possible with a single step processing method.

Macroporous or mesoporous polymer films in hollow fiber geometry

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Lüneburg, Germany

Volker Abetz