Multi-responsive fluorescence of amphiphilic diblock copolymer containing carboxylate azobenzene and N-isopropylacrylamide

Ren, Hao; Chen, Dong; Shi, Yan; Yu, Haifeng; Fu, Zhifeng

doi:10.1016/j.polymer.2016.05.074

Cited by 44 publications

(42 citation statements)

References 63 publications

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“…Additionally, the confinement increased the packing of azobenzene mesogens to the H‐ and J‐type aggregates in the micellar core, whereas azobenzene mesogens were less associated in unconfined geometries. Yu et al developed multiresponsive polymers containing carboxylic azobenzene . The formation of hydrogen bonds and self‐organization of azobenzene mesogens enabled the carboxylic azobenzene‐containing homopolymers and block copolymers to form gels and micelles, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…UV irradiation caused a destruction of gels, and gels were reformed in dark . When the block copolymers were under acid condition, micelles with closely packed carboxylic azobenzene moieties formed because of the inter/intra hydrogen bonds . In contrast, the ionization of carboxylic azo groups under basic condition reduced hydrogen bonds, leading to small aggregates.…”

Section: Introductionmentioning

confidence: 99%

“…However, a substantial amount of research has demonstrated the possibility of fluorescence emission when azobenzene chromophores are densely packed in confined geometries such as bilayers . Micelles and vesicles formed by azobenzene‐containing block copolymers can serve as the confined environment for enhancing fluorescence . Bo and Zhao reported the role of micelle formation in effectively enhancing fluorescence emission .…”

Section: Introductionmentioning

confidence: 99%

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Photoresponsive and fluorescence behaviors of azobenzene‐containing amphiphilic block copolymers

Lee

2017

J Polym Sci B Polym Phys

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The effects of solvency and mole fraction of azobenzene moieties (f PAzoMA ) on the photoresponsive and fluorescence behaviors of poly(acrylic acid)-block-poly(6-[4-(4 0methoxyphenylazo)phenoxy]hexyl methacrylate) (PAA-PAzoMA) amphiphilic diblock copolymers were investigated using UV-vis spectroscopy and fluorescence spectroscopy. The photoresponsive behavior depended strongly on the solvency and f PAzoMA . When dissolved in a PAA-selective solvent, PAA-PAzoMA formed micelles with PAzoMA in the micelle core. The confinement of azobenzene moieties caused a steric hindrance, thereby markedly reducing the kinetics of photoisomerization compared with that of the unconfined PAA-PAzoMA in a nonselective solvent. Additionally, PAA-PAzoMA dissolved in the PAA-selective solvent caused a blue shift of the maximum absorbance, Additional Supporting Information may be found in the online version of this article.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photoresponsive and fluorescence behaviors of azobenzene‐containing amphiphilic block copolymers

Lee

2017

J Polym Sci B Polym Phys

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“…85 On the other hand, H-type and J-type aggregation of azobenzenes can be used for fluorescence emission enhancement. [86][87][88] More specifically, the Yu group found that fluorescence measurements can be employed as an indicator of aggregate size and tightness, and that the aggregates in solution state can be disassembled by photoisomerizing the azobenzenes with UV light. 87,88 However, as a rule of thumb for solid-state polymer-azobenzene complexes, azobenzene aggregation, i.e.…”

Section: Interplay Of Different Interactions In Supramolecular Materimentioning

confidence: 99%

“…By synthesizing copolymers of thermoresponsive pNIPAM and carboxylic-acid-functionalized azobenzene-containing monomers, the Yu group were able to discover a region, in which fluorescence from aggregated azobenzene in the micellar structures can be enhanced by photoisomerization with UV-light. 88 Moreover, the fluorescence of the aggregates responds to changes in temperature and pH, thus showing how clever molecular design and interplay with solvent can lead to truly multiresponsive structures. Additionally, by applying the homopolymer of carboxylic acid functionalized azopolymer in DMSO, UV-irradiation was used to trigger a gel-sol phase transition.…”

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confidence: 99%

Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

2018

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a Noncovalent binding of azobenzenes to polymers allows harnessing light-induced molecular-level motions (photoisomerization) for inducing macroscopic effects, including photocontrol over molecular alignment and self-assembly of block copolymer nanostructures, and photoinduced surface patterning of polymeric thin films. In the last 10 years, a growing body of literature has proven the utility of supramolecular materials design for establishing structure-property-function guidelines for photoresponsive azobenzene-based polymeric materials. In general, the bond type and strength, engineered by the choice of the polymer and the azobenzene, influence the photophysical properties and the optical response of the material system. Herein, we review this progress, and critically assess the advantages and disadvantages of the three most commonly used supramolecular design strategies:hydrogen, halogen and ionic bonding. The ease and versatility of the design of these photoresponsive materials makes a compelling case for a paradigm shift from covalently-functionalized side-chain polymers to supramolecular polymer-azobenzene complexes.

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Recent Progress in Biomimetic Anisotropic Hydrogel Actuators

et al. 2019

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Polymeric hydrogel actuators refer to intelligent stimuli‐responsive hydrogels that could reversibly deform upon the trigger of various external stimuli. They have thus aroused tremendous attention and shown promising applications in many fields including soft robots, artificial muscles, valves, and so on. After a brief introduction of the driving forces that contribute to the movement of living creatures, an overview of the design principles and development history of hydrogel actuators is provided, then the diverse anisotropic structures of hydrogel actuators are summarized, presenting the promising applications of hydrogel actuators, and highlighting the development of multifunctional hydrogel actuators. Finally, the existing challenges and future perspectives of this exciting field are discussed.

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Multi-responsive fluorescence of amphiphilic diblock copolymer containing carboxylate azobenzene and N-isopropylacrylamide

Cited by 44 publications

References 63 publications

Photoresponsive and fluorescence behaviors of azobenzene‐containing amphiphilic block copolymers

Photoresponsive and fluorescence behaviors of azobenzene‐containing amphiphilic block copolymers

Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

Recent Progress in Biomimetic Anisotropic Hydrogel Actuators

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