Thermoresponsive unimolecular micelles with a hydrophobic dendritic core and a double hydrophilic block copolymer shell

Luo, Shi-Zhong; Ling, Congxiang; Hu, Xianglong; Liu, Xi; Chen, Shuaishuai; Han, Mengcheng; Xia, Jiang

doi:10.1016/j.jcis.2010.09.031

Cited by 27 publications

(16 citation statements)

References 48 publications

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“…Although the double phase transition of these unimolecular dendritic nanostructures was demonstrated, a recent publication also mentions that the second collapse behavior was more complicated since the outer corona was not completely collapsed, presumably because of the strong interaction with the inner PNIPAM layer. 13 Based on these results, the authors prepared a new set of dendritic nanostructures composed of PDMA and poly(N,N-diethylacrylamide) (PDEA) instead of PNIPAM, since the latter also possess a LCST of 32 °C and is less toxic than PNIPAM. The ratio of the radius of gyration to the hydrodynamic radius (<Rg>/<Rh>), which reflects the chain density, was found to be ~0.774 at 50 °C suggesting a dense sphere for these nanostructures.…”

Section: Physical-physical Dual Stimuli-responsive Macromoleculesmentioning

confidence: 99%

Multi-stimuli responsive macromolecules and their assemblies

et al. 2013

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In this review, we outline examples that illustrate the design criteria for achieving macromolecular assemblies that incorporate a combination of two or more chemical, physical or biological stimuli-responsive components. Progress in both fundamental investigation into the phase transformations of these polymers in response to multiple stimuli and their utilization in a variety of pratical applications have been highlighted. Using these examples, we aim to explain the origin of employed mechanisms of stimuli responsiveness which may serve as a guideline to inspire future design of multi-stimuli responsive materials.

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Section: Physical-physical Dual Stimuli-responsive Macromoleculesmentioning

confidence: 99%

Multi-stimuli responsive macromolecules and their assemblies

et al. 2013

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“…Besides PIPAAm, poly(N,N-diethylacrylamide) also possesses a LCST of about 32°C and is considered as an alternative thermosensitive water-soluble polymer to replace PIPAAm due to its lower toxicity [315]. Bian et al synthesized poly(styrene-b-N,N-diethylacrylamide) with controlled molecular weight and narrow polydispersity [316].…”

Section: Peo-b-pagementioning

confidence: 99%

Polymeric micelles: authoritative aspects for drug delivery

Kulthe

Choudhari

Inamdar

et al. 2012

Designed Monomers and Polymers

192

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“…In particular, interest in the design and synthesis of star block copolymers with stimuli-responsive segments has increased because the chain architecture (topology) of block copolymers affects their self-assembling behavior and stimuli-responsive properties. [29][30][31][32][33][34][35] Herein, we report the controlled synthesis of novel star block copolymers with poly(N-vinylimidazolium salt) as a poly(ionic liquid) segment and poly(NIPAAm) as a thermoresponsive segment by RAFT polymerization. In addition to the comonomer composition and chain length of each segment, the branched structure and location of the thermoresponsive segment affected the stimuliresponsive properties and assembled structure of the material.…”

Section: Introductionmentioning

confidence: 99%

Temperature-responsive self-assembly of star block copolymers with poly(ionic liquid) segments

Mori

Ebina

Kambara

et al. 2012

Polym J

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Novel star block copolymers containing poly(N-vinylimidazolium salt) as a poly(ionic liquid) segment and poly(N-isopropylacrylamide) (poly(NIPAAm)) as a thermoresponsive segment were synthesized by reversible additionfragmentation chain transfer (RAFT) polymerization. Two R-designed tetrafunctional chain transfer agents (CTAs), including a xanthate-type CTA and a dithiocarbamate-type CTA, were compared for the polymerization of 1-ethyl-3-vinylimidazolium bromide (VEI-Br), which is an ionic liquid-type monomer. The dithiocarbamate-type tetrafunctional CTA was the most efficient CTA for the controlled synthesis of four-armed poly(VEI-Br) stars with low polydispersity values and controlled molecular weights. Star block copolymers with inner thermoresponsive segments connected to their core were synthesized by the RAFT polymerization of VEI-Br, using poly(NIPAAm) stars. In contrast, the RAFT polymerization of NIPAAm using poly(VEI-Br) stars afforded star block copolymers, with block arms consisting of outer block copolymer segments of thermoresponsive poly(NIPAAm). Thermally induced phase separation behavior and assembled structures of star block copolymers were studied in aqueous solution. Keywords: block copolymer; micelle; poly(ionic liquid); self-assembly; star polymer; star block copolymer; thermoresponsive polymer INTRODUCTION Recently, considerable attention has been paid to polymerized ionic liquids or polymeric ionic liquids, which are macromolecules obtained from the polymerization of ionic liquid monomers. [1][2][3] Polymeric ionic liquids with unique and attractive properties can be obtained by adjusting the structure of the cation (for example, imidazolium, pyridinium and tetraalkylammonium) and the anion (for example, halide, tetrafluoroborate and hexafluorophosphate). Potential applications of polymeric ionic liquids include polymeric electrolytes, catalytic membranes, ionic conductive materials, CO 2 absorbents, microwave absorbents and porous materials. Imidazolium salt is the most popular cation introduced into polymer backbones. A variety of polymers containing imidazolium moieties on their side chains have been developed, including poly(meth)acrylate, 4-7 polystyrene 8,9 and poly(N-vinyl imidazolium) 10-13 derivatives. The majority of these poly(ionic liquid)s were prepared by conventional radical polymerization. In addition to the structure of the substituent on the imidazolium ring, the solubility and properties of poly(Nvinylimidazolium salt) depend on the structure of the counteranion.As a result of recent progress in controlled radical polymerization (also known as controlled or living radical polymerization or reversible deactivation radical polymerization), well-defined block copolymers containing imidazolium moieties have been synthesized. 14,15 For example, Waymouth et al. 16,17 demonstrated the

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Thermoresponsive unimolecular micelles with a hydrophobic dendritic core and a double hydrophilic block copolymer shell

Cited by 27 publications

References 48 publications

Multi-stimuli responsive macromolecules and their assemblies

Multi-stimuli responsive macromolecules and their assemblies

Polymeric micelles: authoritative aspects for drug delivery

Temperature-responsive self-assembly of star block copolymers with poly(ionic liquid) segments

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