Temperature‐Dependent Gelation Behaviour of Double Responsive P2VP‐b‐PEO‐b‐P(GME‐co‐EGE) Triblock Terpolymers: A SANS Study
Identifieur interne : 006696 ( Main/Merge ); précédent : 006695; suivant : 006697Temperature‐Dependent Gelation Behaviour of Double Responsive P2VP‐b‐PEO‐b‐P(GME‐co‐EGE) Triblock Terpolymers: A SANS Study
Auteurs : Matthias Karg [Australie] ; Stefan Reinicke [Allemagne] ; Alain Lapp [France] ; Thomas Hellweg [Allemagne] ; Holger Schmalz [Allemagne]Source :
- Macromolecular Symposia [ 1022-1360 ] ; 2011-09.
Descripteurs français
- Wicri :
- topic : Droit d'auteur, Polymère.
English descriptors
- KwdEn :
- Cloud point, Copyright, Core radius, Corona, Deutero gmbh, Form factor, Gaussian, Gaussian coils, Gmbh, High temperature, Higher order, Hydrogel, Internal structure, Kgaa, Macromol, Macromolecule, Micellar, Micelle, Modulus, Neutron, Open association, Outer blocks, Overall micelle radius, P2vp, P2vp block, P2vp core, P2vp cores, Physical crosslinking, Polym, Polymer, Previous work, Relative peak positions, Room temperature, Sans, Sans data, Sans intensity, Sans measurements, Soft matter, Solid lines, Solvent mixture, Storage modulus, Structural changes, Structure factor, Structure factor contribution, Symp, Terpolymer, Triblock, Triblock terpolymer, Triblock terpolymers, Verlag, Verlag gmbh, Volume fraction, Weinheim, Weinheim macromol.
- Teeft :
- Cloud point, Copyright, Core radius, Corona, Deutero gmbh, Form factor, Gaussian, Gaussian coils, Gmbh, High temperature, Higher order, Hydrogel, Internal structure, Kgaa, Macromol, Macromolecule, Micellar, Micelle, Modulus, Neutron, Open association, Outer blocks, Overall micelle radius, P2vp, P2vp block, P2vp core, P2vp cores, Physical crosslinking, Polym, Polymer, Previous work, Relative peak positions, Room temperature, Sans, Sans data, Sans intensity, Sans measurements, Soft matter, Solid lines, Solvent mixture, Storage modulus, Structural changes, Structure factor, Structure factor contribution, Symp, Terpolymer, Triblock, Triblock terpolymer, Triblock terpolymers, Verlag, Verlag gmbh, Volume fraction, Weinheim, Weinheim macromol.
Abstract
Aqueous solutions of a double responsive P2VP62‐b‐PEO452‐b‐P(GME36‐co‐EGE36) triblock terpolymer were investigated by means of small‐angle neutron scattering (SANS) in order to derive information about structural changes going along with the temperature triggered gel‐sol‐gel transition at pH = 7, and the sol‐gel transition at pH = 3.5, respectively, observed by rheology. SANS measurements on dilute samples at different pH and temperature confirmed the formation of core‐shell‐corona micelles under conditions, where only one of the outer blocks is insoluble. In addition, temperature‐dependent scattering experiments were performed for higher volume fractions, that is, the concentration range where hydrogels were formed. This allowed us to identify the structural transitions, being responsible for the gel‐sol‐gel transition at pH = 7, and the structure of the gel phase formed at low pH and elevated temperatures.
Url:
DOI: 10.1002/masy.201000142
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ISTEX:5244B9FEA3B11F75A983C521B0B71614B1A61447Le document en format XML
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<term>Deutero gmbh</term>
<term>Form factor</term>
<term>Gaussian</term>
<term>Gaussian coils</term>
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<term>Previous work</term>
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<term>Sans intensity</term>
<term>Sans measurements</term>
<term>Soft matter</term>
<term>Solid lines</term>
<term>Solvent mixture</term>
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<term>Structural changes</term>
<term>Structure factor</term>
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<term>Weinheim macromol</term>
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<term>Gaussian coils</term>
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<term>High temperature</term>
<term>Higher order</term>
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<term>P2vp block</term>
<term>P2vp core</term>
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<term>Physical crosslinking</term>
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<term>Polymer</term>
<term>Previous work</term>
<term>Relative peak positions</term>
<term>Room temperature</term>
<term>Sans</term>
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<term>Sans intensity</term>
<term>Sans measurements</term>
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<term>Structure factor contribution</term>
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<front><div type="abstract" xml:lang="en">Aqueous solutions of a double responsive P2VP62‐b‐PEO452‐b‐P(GME36‐co‐EGE36) triblock terpolymer were investigated by means of small‐angle neutron scattering (SANS) in order to derive information about structural changes going along with the temperature triggered gel‐sol‐gel transition at pH = 7, and the sol‐gel transition at pH = 3.5, respectively, observed by rheology. SANS measurements on dilute samples at different pH and temperature confirmed the formation of core‐shell‐corona micelles under conditions, where only one of the outer blocks is insoluble. In addition, temperature‐dependent scattering experiments were performed for higher volume fractions, that is, the concentration range where hydrogels were formed. This allowed us to identify the structural transitions, being responsible for the gel‐sol‐gel transition at pH = 7, and the structure of the gel phase formed at low pH and elevated temperatures.</div>
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