| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tenhu, Heikki
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (35/35 displayed)
- 2024Clay Composites by In Situ Polymerization of Ionic Liquid-Based Dispersions
- 2023Clay Composites by In Situ Polymerization of Ionic Liquid-Based Dispersions
- 2022Well-dispersed clay in photopolymerized poly(ionic liquid) matrixcitations
- 2020Poly(N,N-dimethylaminoethyl methacrylate) for removing chromium (VI) through polymer-enhanced ultrafiltration techniquecitations
- 2018Poly(N,N-dimethylaminoethyl methacrylate) for removing chromium (VI) through polymer-enhanced ultrafiltration techniquecitations
- 2017Water-Dispersible Silica-Polyelectrolyte Nanocomposites Prepared via Acid-Triggered Polycondensation of Silicic Acid and Directed by Polycationscitations
- 2016Rheological properties of thermoresponsive nanocomposite hydrogelscitations
- 2016AuNP-Polymeric Ionic Liquid Composite Multicatalytic Nanoreactors for One-Pot Cascade Reactionscitations
- 2016Water-dispersible silica-polyelectrolyte nanocomposites prepared via acid-triggered polycondensation of silicic acid and directed by polycations.citations
- 2016Water-Dispersible Silica-Polyelectrolyte Nanocomposites Prepared via Acid-Triggered Polycondensation of Silicic Acid and Directed by Polycationscitations
- 2016AuNP−polymeric ionic liquid composite multicatalytic nanoreactors for one-pot cascade reactionscitations
- 2013pH dependent polymer surfactants for hindering BSA adsorption to oil-water interface
- 2013Thermoresponsiveness of PDMAEMA. Electrostatic and stereochemical effectscitations
- 2013Imidazolium-Based Poly(ionic liquid)s as New Alternatives for CO2 Capture.citations
- 2012Polymer-Modulated Optical Properties of Gold Solscitations
- 2012Polymer-Modulated Optical Properties of Gold Solscitations
- 2012IR-sintering of ink-jet printed metal-nanoparticles on papercitations
- 2012Screening of the effect of biocidal agents released from poly (acrylic acid) matrices on mould growthcitations
- 2012Crystal morphology modification by the addition of tailor-made stereocontrolled poly(N-isopropyl acrylamide)citations
- 2011Characterization of Water-Dispersible n-Type Poly(benzimidazobenzophenanthroline) Derivatives.citations
- 2009Poly(ethylene imine) and Tetraethylenepentamine as Protecting Agents for Metallic Copper Nanoparticlescitations
- 2009Grafting of montmorillonite nano-clay with butyl acrylate and methyl methacrylate by atom transfer radical polymerization: Blends with poly(BuA-co-MMA).citations
- 2009Tuning the structure of thermosensitive gold nanoparticle monolayerscitations
- 2009Rheological properties of associative star polymers in aqueous solutionscitations
- 2009Grafting of montmorillonite nano-clay with butyl acrylate and methyl methacrylate by atom transfer radical polymerizationcitations
- 2009Rheological Properties of Associative Star Polymers in Aqueous Solutions: Effect of Hydrophobe Length and Polymer Topologycitations
- 2009Association behavior and properties of copolymers of perfluorooctyl ethyl methacrylate and eicosanyl methacrylatecitations
- 2008Direct Imaging of Nanoscopic Plastic Deformation below Bulk Tg and Chain Stretching in Temperature-Responsive Block Copolymer Hydrogels by Cryo-TEMcitations
- 2007Metallic nanoparticles in a polymeric matrix
- 2007Metallic nanoparticles in a polymeric matrix:Electrical impedance switching and negative differential resistance
- 2007Phase behavior and temperature-responsive molecular filters based on self-assembly of polystyrene-block-poly(N-isopropylacrylamide)-block-polystyrenecitations
- 2006A New method for measuring free drug concentrationcitations
- 2005Physical Properties of Aqueous Solutions of a Thermo-Responsive Neutral Copolymer and an Anionic Surfactantcitations
- 2005Association in Aqueous Solutions of a Thermoresponsive PVCL-g-C11EO42 Copolymer.citations
- 2004Complexation of DNA with Poly(methacryl oxyethyl trimethylammonium chloride) and Its Poly(oxyethylene) Grafted Analogue.citations
Places of action
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article
Phase behavior and temperature-responsive molecular filters based on self-assembly of polystyrene-block-poly(N-isopropylacrylamide)-block-polystyrene
Abstract
This work describes the synthesis of temperature-responsive polystyrene-block-poly(N-isopropylacrylamide)-block-polystyrene triblock copolymers, i.e., PS-b-PNIPAM-b-PS, their self-assembly and phase behavior in bulk, and demonstration of aqueous thermoresponsive membranes. A series of PS-b-PNIPAM-b-PS triblock copolymers were synthesized using reversible addition-fragmentation chain transfer (RAFT) polymerization. The hydrophobic PS end blocks were selected to form the minority component, whereas the temperature-responsive PNIPAM midblock accounted for the majority component. The self-assembly and phase behavior in bulk of PS-b-PNIPAM-b-PS as well as selected blends with low molecular weight PNIPAM homopolymers were studied using transmission electron microscopy (TEM). Classical lamellar, cylindrical, spherical, and bicontinuous double gyroid morphologies were observed in the dried state. In aqueous solutions, the glassy PS domains act as physical cross-links, and hydrogels were therefore formed. The bulk block copolymer morphology had a strong effect on the degree of swelling in aqueous solutions upon cooling below the coil-globule transition temperature of the PNIPAM midblock. Bulk compositions with spherical PS domains and PNIPAM continuous phase swelled in water up to 58 times by weight, whereas composition having cylindrical PS domains or bicontinous gyroid structure in bulk swelled 20 or 10 times by weight, respectively. Finally, lamellar compositions did not show any swelling. Composite membranes for separation studies were prepared by spin-coating thin films of PS-b-PNIPAM-b-PS on top of meso/macroporous polyacrylonitrile (PAN) support membrane. The permeability was measured as a function of temperature using aqueous mixture of poly(ethylene glycol) (PEG) with several well-defined molecular weights. The permeability showed a temperature switchable on/off behavior, where higher permeability is obtained below transition temperature of PNIPAM, and the molecular cutoff limits for the PEG molecules are surprisingly lowbetween 108 and 660 g/mol. The results encourage to further develop and optimize these materials for responsive nanofiltration applications.