Controlled thermoreversible transfer of poly(oxazoline) micelles between an ionic liquid and water

Guerrero‐Sánchez, Carlos; Gohy, Jean‐François; D'Haese, Cécile; Thijs, Hanneke M. L.; Hoogenboom, Richard; Schubert, Ulrich S.

doi:10.1039/b804179b

Cited by 49 publications

(54 citation statements)

References 21 publications

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“…The PNonOx was found to be fully stretched by SANS while the PMeOx is coiled in the corona [59]. The formation of PEtOx-b-NonOx micellar aggregates in both water and a hydrophobic ionic liquid was reported by Schubert et al revealing temperature-induced shuttling of the micelles [60]. At low temperature, the micelles are present in water while the decreasing solubility of PEtOx in water at elevated temperatures leads to reversible transfer of the micelles to the ionic liquid.…”

Section: Micellesmentioning

confidence: 88%

Bioinspired Poly(2-oxazoline)s

2011

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Poly(2-oxazoline)s are regarded as pseudopeptides, thus bioinspired polymers, due to their structural relationship to polypeptides. Materials and solution properties can be tuned by varying the side-chain (hydrophilic-hydrophobic, chiral, bioorganic, etc.), opening the way to advanced stimulus-responsive materials and complex colloidal structures. The bioinspired -smart‖ solution and aggregation behavior of poly(2-oxazoline)s in aqueous environments are discussed in this review.

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Section: Micellesmentioning

confidence: 88%

Bioinspired Poly(2-oxazoline)s

2011

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“…140, 141 The aggregation of triblock copolymers in ILs was further exploited with the aim of forming physical ion gels, where it was demonstrated that the P(St-b-EO-b-St) triblock copolymer and [C 4 mim]PF 6 binary system yields a physical ion gel at block copolymer loadings as low as 5 wt %. 142 As mentioned above, block copolymer melts, the solids or theirs concentrated solutions, are macroscopically homogeneous but possess predictable structural heterogeneity at length scales of a few nanometers up to several micrometers.…”

Section: Self-assembly Of Block Copolymers In Ionic Liquidsmentioning

confidence: 99%

Polymers in Ionic Liquids: Dawn of Neoteric Solvents and Innovative Materials

Ueki

Watanabe

2011

Bulletin of the Chemical Society of Japan

154

144

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In this paper, we review recent advances in the use of polymers in ionic liquids (ILs) from the view point of the "dawn of neoteric solvents and innovative materials." The first part of this paper presents a brief review of the solubility parameters of ILs, which are expected to serve as a qualitative guide for predicting polymer solubility in ILs; however, this concept cannot be used to rationalize a number of cases in which strong Coulombic interactions dominate the solubility parameters of the ILs. Thus, solubility of 24 different common synthetic polymers is experimentally demonstrated under dilute conditions (3 wt %) in four different common ILs. It is found that the Lewis basicities of the counter anions in the ILs play an important role in determining the solubility of the polymers. ILs can also be used as good solvents for low-solubility biopolymers and as good dispersion media of carbon nanotubes, which contributes to the fields of biorefinery processes and advanced materials. Certain combinations of polymers in ILs undergo phase separations as the temperature of the solutions is varied. The solubility of a nonionic polymer in water generally decreases with increasing temperature, and certain combinations exhibit lower critical solution temperature (LCST) phase separation, whereas the solubility of a polymer in an organic solvent generally increases with increasing temperature and in some cases upper critical solution temperature (UCST) phase separation is observed. Interestingly, both LCST and UCST phase separations are observed for certain polymers in ILs. After presenting possible explanations of the solubility of polymers in ILs, recent developments in the field of thermosensitive polymers in ILs are discussed from the perspective of materials science, where such phase separations are exploited to trigger abrupt changes in polymer properties. The final part of this review describes the thermosensitive self-assembly of block copolymers in ILs. Similar to conventional molecular solvents, block copolymers in ILs exhibit variable self-assemblies in solution and in the bulk.

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“…They revealed that the architecture of the micelles formed by the copolymers characteristically correlated with their composition. Schubert and co-workers prepared p n NonOx-block-pEtOx block copolymers to provide micelles suitable for the thermoreversible phase transfer between hydrophobic ionic liquids and water [177]. Schubert and co-workers prepared triblock amphihpilic and fluorophilic copolymers of the composition pEtOx-block-p(Et) n PeOx-block-p(2F)PhOx via microwave-assisted polymerizations [178].…”

Section: Self-assembly Of Triblock Copoly(2-oxazoline)smentioning

confidence: 99%

Design Strategies for Functionalized Poly(2-oxazoline)s and Derived Materials

2013

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Abstract:The polymer class of poly(2-oxazoline)s currently is under intensive investigation due to the versatile properties that can be tailor-made by the variation and manipulation of the functional groups they bear. In particular their utilization in the biomedic(in)al field is the subject of numerous studies. Given the mechanism of the cationic ring-opening polymerization, a plethora of synthetic strategies exists for the preparation of poly(2-oxazoline)s with dedicated functionality patterns, comprising among others the functionalization by telechelic end-groups, the incorporation of substituted monomers into (co)poly(2-oxazoline)s, and polymeranalogous reactions. This review summarizes the current state-of-the-art of poly(2-oxazoline) preparation and showcases prominent examples of poly(2-oxazoline)-based materials, which are retraced to the desktop-planned synthetic strategy and the variability of their properties for dedicated applications.

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Controlled thermoreversible transfer of poly(oxazoline) micelles between an ionic liquid and water

Cited by 49 publications

References 21 publications

Bioinspired Poly(2-oxazoline)s

Bioinspired Poly(2-oxazoline)s

Polymers in Ionic Liquids: Dawn of Neoteric Solvents and Innovative Materials

Design Strategies for Functionalized Poly(2-oxazoline)s and Derived Materials

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