Siloxane-grafted membranes
First Claim
1. A siloxane-grafted cellulosic semipermeable composite membrane comprising chemical structure for providing a substantially constant flux as a function of time, consisting essentially of non-crosslinked covalently bonded reaction product of hydroxyl-reactive functional groups of a polysiloxane with hydroxyl groups of an asymetric cellulosic semipermeable membrane, wherein said hydroxyl-reactive functional groups are selected from acid halides, aminoacid halides, sulfonyl halides, and phosphoryl halides.
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Abstract
Composite cellulosic semipermeable membranes are disclosed which are the covalently bonded reaction product of an asymmetric cellulosic semipermeable membrane and a polysiloxane containing reactive functional groups. The two reactants chemically bond by ether, ester, amide or acrylate linkages to form a siloxane-grafted cellulosic membrane having superior selectivity and flux stability. Selectivity may be enhanced by wetting the surface with a swelling agent such as water.
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Citations
7 Claims
- 1. A siloxane-grafted cellulosic semipermeable composite membrane comprising chemical structure for providing a substantially constant flux as a function of time, consisting essentially of non-crosslinked covalently bonded reaction product of hydroxyl-reactive functional groups of a polysiloxane with hydroxyl groups of an asymetric cellulosic semipermeable membrane, wherein said hydroxyl-reactive functional groups are selected from acid halides, aminoacid halides, sulfonyl halides, and phosphoryl halides.
Specification