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Ferrocene-Modified Block Copolymers for the Preparation of Smart Porous Membranes

Schöttner, Sebastian and Hossain, Rimjhim and Rüttiger, Christian and Gallei, Markus :
Ferrocene-Modified Block Copolymers for the Preparation of Smart Porous Membranes.
[Online-Edition]
In: Polymers, 9 (10) ISSN 2073-4360
[Article], (2017)

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Item Type: Article
Title: Ferrocene-Modified Block Copolymers for the Preparation of Smart Porous Membranes
Language: English
Abstract:

The design of artificially generated channels featuring distinct remote-switchable functionalities is of critical importance for separation, transport control, and water filtration applications. Here, we focus on the preparation of block copolymers (BCPs) consisting of polystyrene-block-poly(2-hydroxyethyl methacrylate) (PS-b-PHEMA) having molar masses in the range of 91 to 124 kg mol−1 with a PHEMA content of 13 to 21 mol %. The BCPs can be conveniently functionalized with redox-active ferrocene moieties by a postmodification protocol for the hydrophilic PHEMA segments. Up to 66 mol % of the hydroxyl functionalities can be efficiently modified with the reversibly redox-responsive units. For the first time, the ferrocene-containing BCPs are shown to form nanoporous integral asymmetric membranes by self-assembly and application of the non-solvent-induced phase separation (SNIPS) process. Open porous structures are evidenced by scanning electron microscopy (SEM) and water flux measurements, while efficient redox-switching capabilities are investigated after chemical oxidation of the ferrocene moieties. As a result, the porous membranes reveal a tremendously increased polarity after oxidation as reflected by contact angle measurements. Additionally, the initial water flux of the ferrocene-containing membranes decreased after oxidizing the ferrocene moieties because of oxidation-induced pore swelling of the membrane.

Journal or Publication Title: Polymers
Volume: 9
Number: 10
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: 07 Fachbereich Chemie
Date Deposited: 18 Oct 2017 10:45
Last Modified: 18 Oct 2017 10:45
Official URL: https://doi.org/10.3390/polym9100491
URN: urn:nbn:de:tuda-tuprints-68905
URI: http://tuprints.ulb.tu-darmstadt.de/id/eprint/6890
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