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Double Stimuli-Responsive Porous Mem- branes from Polystyrene-block-poly(N,N- dimethyl-aminoethyl methacrylate) Diblock Copolymers
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schacher, Felix H. Rudolph, Tobias Ulbricht, Mathias Chemie, Makromolekulare |
| Copyright Year | 2009 |
| Abstract | INTRODUCTION Block copolymers represent an ambitious class of materials as their scope of applicability is still rising. Mostly, this is due to their inimitable self-assembling properties, rendering them suitable for applications in solution, in thin films or as components of porous composite membranes. Also in the field of industrially important membrane production processes, in particular via controlled phase separation (“phase-inversion”) of polymer solutions, block copolymers are becoming more and more popular. This is mainly attributed to the constantly increasing number of processes in which the desired separation problem cannot be solved with state-of-the-art membranes. One of the key features of block copolymers is the facile implementation of “smart” materials, containing compartments with the ability to change conformation or properties upon application of environmental stimuli like pH, temperature or light. Non-solvent-induced phase separation (NIPS) is the most important industrial process for the fabrication of “asymmetric” membranes, having a very thin “skin” layer supported by a macroporous substructure. Recently, this process has been applied for the first time to well-defined block copolymers, polystyrene-block-poly(4vinylpyridine) (PS-b-P4VP). However, the reported procedures yield membranes which can react to a single stimulus only. Here we present the formation of double stimuli-responsive porous membranes for the possible applications in ultrafiltration or microfiltration. These materials combine a rather narrow pore-size distribution with mechanical stability and high water flux. The membranes were prepared via NIPS from amphiphilic polystyrene-block-poly(N,Ndimethylaminoethyl methacrylate) (PS-b-PDMAEMA) diblock copolymers in THF/DMF mixtures. The resulting structures are selfsupporting and defect-free over several hundred μm. The advantage of using PDMAEMA as the hydrophilic block is that its solubility in aqueous solution can be triggered by two stimuli, pH and temperature. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.chemie.uni-bayreuth.de/mcii/de/pub/html/32687/327.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
