Highly porous polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymer membranes are... more Highly porous polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymer membranes are prepared using carbohydrates as additives. Therefore α-cyclodextrine, α-(D)-glucose, and saccharose (cane sugar) are tested for the membrane formation of three different PS-b-P4VP polymers. The addition of the carbohydrates leads to an increasing viscosity of the membrane solutions due to hydrogen bonding between hydroxyl groups of the carbohydrates and pyridine units of the block copolymer. In all cases, the membranes made from solution with carbohydrates have higher porosity, an improved narrow pore distribution on the surface and a higher water flux as membranes made without carbohydrates with the same polymer, solvent ratio, and polymer concentration.
The formation of integral asymmetric membranes from ABC triblock terpolymers by non-solvent-induc... more The formation of integral asymmetric membranes from ABC triblock terpolymers by non-solvent-induced phase separation is shown. They are compared with the AB diblock copolymer precursors. Triblock terpolymers of polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) (PS-b-P2VP-b-PEO) with two compositions are investigated. The third block supports the formation of a membrane in a case, where the corresponding diblock copolymer does not form a good membrane. In addition, the hydrophilicity is increased by the third block and due to the hydroxyl group the possibility of post-functionalization is given. The morphologies are imaged by scanning electron microscopy. The influence of the PEO on the membrane properties is analyzed by water flux, retention, and dynamic contact angle measurements.
... Composite Membranes of Polystyrene-block-Poly(2-vinylpyridine) on a Nonwoven Adina Jung, Sofi... more ... Composite Membranes of Polystyrene-block-Poly(2-vinylpyridine) on a Nonwoven Adina Jung, Sofia Rangou, Clarissa Abetz, Volkan Filiz, Volker Abetz* 1. Introduction ... Mater. 2008, 20, 869. [3] WA Phillip, J. Rzayev, MA Hillmyer, EL Cussler, J. Membr. Sci. 2006, 286, 144. ...
ABSTRACT Isoporous integral-asymmetric membranes of tailor-made poly(tert-butylstyrene)- and poly... more ABSTRACT Isoporous integral-asymmetric membranes of tailor-made poly(tert-butylstyrene)- and poly(4-trimethylsilylstyrene)-block-poly(4-vinylpyridine) diblock copolymers are reported here for the first time. The membrane development involved the optimization of the production process—which is a combination of block copolymer self-assembly and the non-solvent induced phase inversion process. The membranes showed an improved thermal and chemical stability compared to previously reported polystyrene-block-poly(4-vinylpyridine) membranes, thus the number of potential application areas for such type of isoporous membranes is increased.
Highly porous polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymer membranes are... more Highly porous polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymer membranes are prepared using carbohydrates as additives. Therefore α-cyclodextrine, α-(D)-glucose, and saccharose (cane sugar) are tested for the membrane formation of three different PS-b-P4VP polymers. The addition of the carbohydrates leads to an increasing viscosity of the membrane solutions due to hydrogen bonding between hydroxyl groups of the carbohydrates and pyridine units of the block copolymer. In all cases, the membranes made from solution with carbohydrates have higher porosity, an improved narrow pore distribution on the surface and a higher water flux as membranes made without carbohydrates with the same polymer, solvent ratio, and polymer concentration.
The formation of integral asymmetric membranes from ABC triblock terpolymers by non-solvent-induc... more The formation of integral asymmetric membranes from ABC triblock terpolymers by non-solvent-induced phase separation is shown. They are compared with the AB diblock copolymer precursors. Triblock terpolymers of polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) (PS-b-P2VP-b-PEO) with two compositions are investigated. The third block supports the formation of a membrane in a case, where the corresponding diblock copolymer does not form a good membrane. In addition, the hydrophilicity is increased by the third block and due to the hydroxyl group the possibility of post-functionalization is given. The morphologies are imaged by scanning electron microscopy. The influence of the PEO on the membrane properties is analyzed by water flux, retention, and dynamic contact angle measurements.
... Composite Membranes of Polystyrene-block-Poly(2-vinylpyridine) on a Nonwoven Adina Jung, Sofi... more ... Composite Membranes of Polystyrene-block-Poly(2-vinylpyridine) on a Nonwoven Adina Jung, Sofia Rangou, Clarissa Abetz, Volkan Filiz, Volker Abetz* 1. Introduction ... Mater. 2008, 20, 869. [3] WA Phillip, J. Rzayev, MA Hillmyer, EL Cussler, J. Membr. Sci. 2006, 286, 144. ...
ABSTRACT Isoporous integral-asymmetric membranes of tailor-made poly(tert-butylstyrene)- and poly... more ABSTRACT Isoporous integral-asymmetric membranes of tailor-made poly(tert-butylstyrene)- and poly(4-trimethylsilylstyrene)-block-poly(4-vinylpyridine) diblock copolymers are reported here for the first time. The membrane development involved the optimization of the production process—which is a combination of block copolymer self-assembly and the non-solvent induced phase inversion process. The membranes showed an improved thermal and chemical stability compared to previously reported polystyrene-block-poly(4-vinylpyridine) membranes, thus the number of potential application areas for such type of isoporous membranes is increased.
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