Graphene oxide grafted with polyoxazoline as thermoresponsive support for facile catalyst recycling by reversible thermal switching between dispersion and sedimentation

The future of poly(2-oxazoline)s

“…[77] The group of Mulhaupt exploited thermoresponsive poly(2oxazoline)s with LCST behavior to gain thermal control over the aggregation and dispersion behavior of silver nanoparticles and graphene oxide, providing opportunities for efficient catalyst recycling by a mild increase of temperature. [78,79] Furthermore, it was demonstrated that thermoresponsive poly(2-oxazoline)-coated particles with LCST behavior could be shuttled between water and ethyl acetate by variation of the temperature allowing efficient transport of a loaded cargo in between the phases of this biphasic solvent system. [80] Similar shuttling of poly(2-oxazoline) block copolymer micelles has previously also been demonstrated in biphasic water-ionic liquid systems.…”

Countercation Engineering of Graphene-Oxide Nanosheets for Imparting a Thermoresponsive Ability

“…Owing to their solution processability, large-scale production, and low production cost, GO nanosheets are regarded as a promising building block for functional soft materials. In particular, thermoresponsive GO nanosheets have been widely employed for the development of smart membranes/ surfaces, 8−11 hydrogel actuators, 12−16 recyclable systems, 17,18 and biomedical applications. 19−22 However, current synthetic strategies for generating such thermoresponsive GO nanosheets have relied exclusively on the covalent or non-covalent modification of their surfaces with thermoresponsive polymers, such as poly(N-isopropylacrylamide).…”

“…Owing to their solution processability, large-scale production, and low production cost, GO nanosheets are regarded as a promising building block for functional soft materials. In particular, thermoresponsive GO nanosheets have been widely employed for the development of smart membranes/surfaces, − hydrogel actuators, − recyclable systems, , and biomedical applications. − However, current synthetic strategies for generating such thermoresponsive GO nanosheets have relied exclusively on the covalent or non-covalent modification of their surfaces with thermoresponsive polymers, such as poly­( N -isopropylacrylamide). − Their synthetic processes are usually complicated, and the presence of these thermoresponsive polymers on the surfaces of GO nanosheets may hinder their further functionalization. If GO nanosheets themselves could become thermoresponsive without using such thermoresponsive polymers by a simple method, the design strategies for functional soft materials would be greatly expanded.…”

Polyoxazoline‐modified graphene oxides with improved water and epoxy resin dispersibility and stability towards composite applications

“…However, due to the toxicity and steric reasons, it is generally used as partially modified PEI conjugates 35,36 . Aside from drug delivery, 37–40 gene delivery, 35,41 and photothermal therapy applications, 42 poly(2‐ethyl‐2‐oxazoline), 43 poly(2‐methyl‐2‐oxazoline), 44,45 partially hydrolyzed poly(2‐methyl‐2‐oxazoline), 46 and branched polyethyleneimine 47–49 were also integrated into the graphene‐based nanomaterials to increase the interfacial interactions, dispersion stability, mechanical, dielectric, and gas barrier properties of the polymer nanocomposites. Tong et al prepared nanocomposite films of poly(vinylidene‐co‐hexafluoropropylene) (PVDF‐HFP) and PEI‐modified graphene sheets.…”

“…The grafting was performed in the termination step of the polymerization and the highest grafting extent was found to be 30 wt%. Despite the improvements in the aqueous dispersion of reduced GO, the effects of the modification conditions on the extent of the polymer grafting and the changes in the structure of the reduced GO and PEOZ after the performed modifications were not investigated 44 …”