The large and stable photomechanical effect in the glassy guest-host azopolymers

Konieczkowska, Jolanta; Bujak, Karolina; Nocoń, Klaudia; Schab‐Balcerzak, Ewa

doi:10.1016/j.dyepig.2019.107659

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…Consequently, they are assessed as being very good hosts for supramolecular azo systems devoted to the inscription of stable optical anisotropy. Ten years ago, the scientific group of E. Schab-Balcerzak reported for the first time the obtaining of hydrogen-bonded supramolecular azo-polyimides [ 25 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Testing the Performance of the Azo-Polyimide Supramolecular Systems as Substrate for Sensors Based on Platinum Electrodes

Sava¹,

Asăndulesa²,

Barzic³

et al. 2023

Materials

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Azo-polyimide films with supramolecular structure were obtained by casting onto glass plates a mixture based on polyamidic acid and different quantities of azochromophore, followed by thermal treatment to realize the final azo-polyimide structure. The dielectric characteristics of the supramolecular structure of polymer films were investigated by broad-band dielectric spectroscopy measurements at different temperatures and frequencies. The free-standing films proved to be flexible and tough and maintained their integrity after repeated bending. The work of adhesion at the polymer/platinum interface was calculated after the evaluation of the surface energy parameters before and after plasma treatment. Atomic force microscopy was used to image the surface morphology, the evolution of the roughness parameters, and the adhesion force between the platinum-covered tip and the polymer surface, registered at the nanoscale with the quantity of the azo dye introduced in the system. The simulation of the columnar growth of a platinum layer was made to provide information about the deposition parameters that should be used for optimal results in the deposition of platinum electrodes for sensors.

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Section: Introductionmentioning

confidence: 99%

Testing the Performance of the Azo-Polyimide Supramolecular Systems as Substrate for Sensors Based on Platinum Electrodes

Sava¹,

Asăndulesa²,

Barzic³

et al. 2023

Materials

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“…Although the red-colored azobenzenes (AB) have been known for years as dyes, their applications nowadays span from energy and information storage [1][2][3][4][5], organocatalysis [6], photobiology and photopharmacology [7], host-guest chemistry [8], molecular mechanics [9,10], to molecular machines [11]. This popularity is due to the ability of ABs to isomerize from their energetically more stable (E)-to the meta-stable (Z)-isomer by irradiation with light [12].…”

Section: Introductionmentioning

confidence: 99%

Continuous flow synthesis of azobenzenes via Baeyer–Mills reaction

Griwatz¹,

Kunz²,

Wegner³

2022

Beilstein J. Org. Chem.

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Azobenzene, as one of the most prominent molecular switches, is featured in many applications ranging from photopharmacology to information or energy storage. In order to easily and reproducibly synthesize non-symmetric substituted azobenzenes in an efficient way, especially on a large scale, the commonly used Baeyer–Mills coupling reaction was adopted to a continuous flow setup. The versatility was demonstrated with a scope of 20 substances and the scalability of this method exemplified by the synthesis of >70 g of an azobenzene derivative applied in molecular solar thermal storage (MOST) systems.

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“…For this purpose, a synergism among concepts of chemical design, surface engineering, and laser physics must be simultaneously considered to attain a supramolecular polymer architecture that renders to the desired PI film morphology. The strategy of SRG preparation on azo-PI layers via the hydrogen-bonded supramolecular arrangement of PI chains had been first evidenced by the group of E. Schab-Balcerzak [ 30 , 31 , 32 , 33 , 34 , 35 ]. They employed chromophores which included a pyridine ring as a replacement for the phenyl unit of azobenzene or a matrix modified to comprise pyridine.…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Azo-Chromophore Sort on the Features of the Supramolecular Azopolyimide Films Desired to Be Used as Substrates for Flexible Electronics

Stoica¹,

Epure

Barzic³

et al. 2022

IJMS

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High-performance supramolecular polyimide systems were synthesized via a simple and innovative approach using two types of azo-chromophores, leading to concomitant special properties: high thermostability, the ability to be processed in the form of films with high flexibility, adequate morphological features, and good structuring capacity via phase mask ultraviolet (UV) laser irradiation, induced by the presence of the azo groups (–N=N–). The dimension and the anisotropy degree of the micro/nano patterns obtained on the surface of the flexible films (determined by atomic force microscopy) depend on the azo-dye type used in the supramolecular azopolyimide synthesis, which were higher when the azo-chromophore containing a –cyano group (−C≡N) was used. The molecular dynamics method, an excellent tool for an in-depth examination of the intermolecular interactions, was used to explain the morphological aspects. Energetic, dynamic and structural parameters were calculated for the two systems containing azo-chromophores, as well as for the pristine polymer system. It was highlighted that the van der Waals forces make a major contribution to the intermolecular interactions. The results from the combination of the dynamic analysis and the concentration profile explain the better mobility of the polyimide chains with a maximum content of azo groups in the cis configuration compared to the other systems. Taking all these data into account, the surfaces of the films can be tuned as required for the proposed applications, namely as substrates for flexible electronis.

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The large and stable photomechanical effect in the glassy guest-host azopolymers

Cited by 10 publications

References 30 publications

Testing the Performance of the Azo-Polyimide Supramolecular Systems as Substrate for Sensors Based on Platinum Electrodes

Testing the Performance of the Azo-Polyimide Supramolecular Systems as Substrate for Sensors Based on Platinum Electrodes

Continuous flow synthesis of azobenzenes via Baeyer–Mills reaction

The Impact of the Azo-Chromophore Sort on the Features of the Supramolecular Azopolyimide Films Desired to Be Used as Substrates for Flexible Electronics

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