Composite hollow fiber membrane
AssigneeNational University of Singapore
InventorsCanzeng Liang, Tai-Shung Chung
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Abstract
There is provided a composite hollow fiber membrane for gas and vapour separation comprising: a porous membrane substrate; and a selective layer of cross-linked polydimethylsiloxane (PDMS) provided on a surface of the porous membrane substrate, wherein the molecular weight of the cross-linked PDMS is ≥100 kg/mol. There is also provided a method of forming the composite hollow fiber membrane, and a method of forming the cross-linked polydimethylsiloxane (PDMS) having a molecular weight ≥100 kg/mol.
Claims17
A composite hollow fiber membrane for gas and vapour separation comprising:
- a porous membrane substrate;
- and
- a selective layer of cross-linked polydimethylsiloxane (PDMS) provided on the surface of the porous membrane substrate, wherein the molecular weight of the cross-linked PDMS is ≥500 kg/mol, and the selective layer is formed from a solution containing 0.25-0.30 weight % of the cross-linked PDMS.
A method of forming cross-linked polydimethylsiloxane (PDMS) having a molecular weight ≥100 kg/mol, the method comprising:
- mixing a PDMS elastomer base and a cross-linking agent for a first pre-determined period of time at a first pre-determined temperature to form a first mixture,
- heating the first mixture at a second pre-determined temperature for a second pre-determined period of time,
- adding a non-polar organic solvent to the heated mixture to form a solution of partially cross-linked PDMS and,
- stirring the solution of partially cross-linked PDMS for a third pre-determined period of time at a third pre-determined temperature to form a mixture of highly cross-linked PDMS.
Dependencies are inferred from the claim text.