Ionic azo-codendrimers: Influence of the acids contents in the liquid crystalline properties and the photoinduced optical anisotropy

Hernández‐Ainsa, Silvia; Alcalá, R.; Barberá, Joaquín; Marcos, Mercedes; Sánchez, Carlos; Serrano, José Luís

doi:10.1016/j.eurpolymj.2010.11.013

Cited by 18 publications

(12 citation statements)

References 43 publications

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“…Ionic interactions were used by Bazuin and coworkers for grafting azobenzene derivatives to methylated poly(4-vinylpyridine), yielding liquid crystalline polyelectrolytes 27 , and by Marcos and coworkers for the preparation of azobenzene containing poly(propyleneimine) codendrimers by simple acid-base titration. [28][29][30] Alternatively, hydrogen bonding combines ease of preparation with high specificity and directionality between components. Priimagi and coworkers pioneered the research on hydrogen bonded supramolecular side chain azopolymers by complexing poly(4-vinylpyridine) with a variety of azobenzene molecules.…”

Section: Introductionmentioning

confidence: 99%

Light-Responsive Self-Assembled Materials by Supramolecular Post-Functionalization via Hydrogen Bonding of Amphiphilic Block Copolymers

et al. 2016

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A new class of light-responsive supramolecular amphiphilic block copolymers (BCs) based on the association through multiple H-bonding between 4-isobutyloxyazobenzene motifs and 2,6diacylaminepyridine units is reported. Block copolymers containing 2,6-diacylaminopyridine side units, as hydrophobic block, and poly(ethylene glycol), as a hydrophilic segment, were functionalized with either a carboxylic acid azodendron, via double H-bonding, or a thymine azobenzene, via triple H-bonding. The structural and thermal characterization of these supramolecular azo-copolymers in bulk and solution is presented. The work emphasizes the selfassembly of these supramolecular polymers in water and the study of their UV-light responsive properties by UV-vis spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM), and synchrotron small-angle X-ray (SAXS). The present noncovalent postpolymerization functionalization strategy has provided stable self-assemblies in water with light responsive properties that can be used to load and trigger the delivery of small fluorescent molecules.

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Section: Introductionmentioning

confidence: 99%

Light-Responsive Self-Assembled Materials by Supramolecular Post-Functionalization via Hydrogen Bonding of Amphiphilic Block Copolymers

et al. 2016

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“…The ionic attachment of moieties to the periphery of dendrimers to obtain LC dendrimers emerged as a very straightforward approach for functionalising dendrimers. [19,20,[38][39][40][41][42][43][44][45][46][47] The ionic fluorinated LC dendrimers described so far, consist of PPI and PAMAM dendrimers having amine groups at the periphery that have been modified with carboxylic acids bearing fluorinated chains in their structure. [48][49][50][51][52] Essentially this binding consists of a proton exchange between the carboxylic acid (acid group) and the amine group (base) present at the periphery of PAMAM or PPI, which results in the formation of an ionic salt.…”

Section: 2ionic Fluorinated Lc Dendrimersmentioning

confidence: 99%

Fluorinated liquid crystalline dendrimers

Hernández‐Ainsa

Barberá

2015

Journal of Fluorine Chemistry

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“…The initial works on the photosensitive polymers were basically limited to a detailed study of LC azobenzene-containing homopolymers and random copolymers. [1][2][3][4][5][6][7][8][9][10] However, further development of these works received a bright continuation in the creation of more complex hybrid systems based on LC dendrimers [11][12][13] and LC block copolymers (PLCBCs) [14][15][16][17] of different architecture in which photochromic groups can be covalently attached to the backbone of polymers or as small guest molecules by noncovalent interactions (hydrogen bonds, ionic bonds, and so on). As a rule, block copolymers successfully combine the properties of their constituent subblocks, which allows creating new functional materials combining photochromism and optical properties of liquid crystals.…”

Section: Doi: 101002/marc202000384mentioning

confidence: 99%

Photopatterning of Azobenzene‐Containing Liquid Crystalline Triblock Copolymers: Light‐Induced Anisotropy and Photostabilization

Audia

Bugakov

Boiko

et al. 2020

Macromol. Rapid Commun.

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Photochromic liquid crystalline block copolymers (PLCBCs) are currently playing a significant role as light‐responsive materials because of their light controllable features over multiple length scales. Herein, a study of the photoinduced optical anisotropy derived by the combination of orientation phenomena at molecular and supramolecular levels in a novel kind of side‐chain PLCBCs with mesogenic phenyl benzoate groups and pyridine units that is hydrogen bonded with azobenzene‐containing phenol is reported. Based on the polymeric architectures and composition, the supramolecular configuration self‐organizes in different microphases that affect the material response to the external stimuli. Simple, 1D, polarization holograms are recorded to evaluate the photoinduced birefringence. The first step, light patterning, involves the orientation of the azobenzene units and precedes a thermal treatment that amplifies the induced anisotropy through the cooperative orientation of the mesogenic units. By selective extraction, the azobenzene units can be removed, making the material transparent to the visible light. Excellent photostability of the material birefringence is obtained, whose final value is strongly affected by the block copolymer's architecture. The versatility in the molecular design, the fine control of the photoinduced features by external parameters, and, finally, the possibility to achieve photostability make these materials of great potential for developing optical and photonic devices.

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Ionic azo-codendrimers: Influence of the acids contents in the liquid crystalline properties and the photoinduced optical anisotropy

Cited by 18 publications

References 43 publications

Light-Responsive Self-Assembled Materials by Supramolecular Post-Functionalization via Hydrogen Bonding of Amphiphilic Block Copolymers

Light-Responsive Self-Assembled Materials by Supramolecular Post-Functionalization via Hydrogen Bonding of Amphiphilic Block Copolymers

Fluorinated liquid crystalline dendrimers

Photopatterning of Azobenzene‐Containing Liquid Crystalline Triblock Copolymers: Light‐Induced Anisotropy and Photostabilization

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