| 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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Hietala, Sami
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2025Amorphous solid dispersions of amphiphilic polymer excipients and indomethacin prepared by hot melt extrusioncitations
- 2024Amorphous solid dispersions of amphiphilic polymer excipients and indomethacin prepared by hot melt extrusioncitations
- 2024Area-Selective Etching of Poly(lactic acid) Films via Catalytic Hydrogenolysis and Crackingcitations
- 2023Fabrication of hydrogel microspheres via microfluidics using inverse electron demand Diels-Alder click chemistry-based tetrazine-norbornene for drug delivery and cell encapsulation applicationscitations
- 2021Mild alkaline separation of fiber bundles from eucalyptus bark and their composites with cellulose acetate butyratecitations
- 2021Air oxidized activated carbon catalyst for aerobic oxidative aromatizations of N-heterocyclescitations
- 2020Methyl cellulose/cellulose nanocrystal nanocomposite fibers with high ductilitycitations
- 2017One-step carbon nanotubes grafting with styrene-co-acrylonitrile by reactive melt blending for electrospinning of conductive reinforced composite membranescitations
- 2017Titanium alkylphosphate functionalised mesoporous silica for enhanced uptake of rare-earth ionscitations
- 2016Rheological properties of thermoresponsive nanocomposite hydrogelscitations
- 2015Water-Resistant, Transparent Hybrid Nanopaper by Physical Cross-Linking with Chitosancitations
- 2015Carbocatalysed Oxidative C-sp2-C-sp2 Homocouplings of Benzo-Fused Heterocyclescitations
- 2015Carbocatalysed Oxidative C sp 2 -C sp 2 Homocouplings of Benzo-Fused Heterocyclescitations
- 2013Chemistry and water-repelling properties of phenyl-incorporating wood compositescitations
- 2013Thermoresponsiveness of PDMAEMA. Electrostatic and stereochemical effectscitations
- 2012Crystal morphology modification by the addition of tailor-made stereocontrolled poly(N-isopropyl acrylamide)citations
- 2009Rheological properties of associative star polymers in aqueous solutionscitations
- 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
Places of action
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article
Rheological properties of associative star polymers in aqueous solutions
Abstract
Rheological properties of aqueous solutions of well-defined four-armed amphiphilic star block copolymers, poly(acrylic acid)-block-polystyrene (PAA-b-PS)(4), were investigated as a function of the length of the PS blocks, polymer concentration, and temperature and compared with a corresponding triblock copolymer. These polymers, synthesized by atom transfer radical polymerization (ATRP), were found to form hydrogels due to intermolecular association originating from the PS blocks. The increasing length of the PS block was observed to lead to more elastic networks due to increased hydrophobic interaction. Polymers bearing shorter PS blocks gave gels with relatively long linear response followed by strain hardening before shear thinning while the longer PS blocks lead to formation of elastic but brittle gels with limited linear regime before shear thinning. Star-block copolymers showed more elastic behavior compared with a triblock copolymer of comparable molar mass and composition. In small-angle X-ray scattering measurements the increasing lengths of the PS blocks were observed to lead to a shift in the scattering maxima toward lower q-values. Both rheological and X-ray characterization showed that the thermal properties of the gels are changed by increasing the PS block lengths. Gels with short PS blocks soften upon heating at lower temperatures compared with the gels with longer PS blocks.