Photoinduced properties of “T-type” polyimides with azobenzene or azopyridine moieties

Bujak, Karolina; Sava, Ion; Stoica, Iuliana; Tiron, Vasile; Topală, Ionuț; Węgłowski, Rafał; Schab‐Balcerzak, Ewa; Konieczkowska, Jolanta

doi:10.1016/j.eurpolymj.2020.109563

Cited by 11 publications

(10 citation statements)

References 57 publications

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“…Scientific research on the modification and functionalization of PIs in order to endow them with smart functions is of particular challenge nowadays, one perspective route being the incorporation of ABn structural unit in their macromolecular chains. In this context, several synthetic routes have been developed so far, most of them involving the general condensation reaction of ABn-functionalized monomers ,− or the postfunctionalization strategy which allows ABn chromophores to be introduced into reactive precursor polymers. − The first method is the most used because of the better control of sequence chromophore distribution.…”

Section: Introductionmentioning

confidence: 99%

Structural Chemistry-Assisted Strategy toward Fast Cis–Trans Photo/Thermal Isomerization Switch of Novel Azo-Naphthalene-Based Polyimides

Constantin¹,

Sava²,

Damaceanu³

2021

Macromolecules

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Pursuing the research toward smart material development, novel azopolyimides containing highly photoresponsive azo-naphthalene moieties are synthesized and fully characterized toward efficient, fast, and stable cis−trans photo/ thermal isomerization switch. To this aim, a novel triphenylmethane diamine carrying a photochromic receptor is prepared and used in polycondensation with aromatic dianhydrides. Insights into molecular weights and thermal, optical, and electrochemical characteristics are employed to accomplish basic characterizations. To prove the switching characteristics insufficiently explored for polyimides (PIs), trans−cis and cis−trans photo/thermal isomerizations are surveyed by UV−vis and 1 H NMR investigations. UV− vis absorption studies reveal unprecedented fast trans−cis switches (47−130 s) through rotation mechanism in dimethylformamide, with one of the highest efficiencies reported nowadays for PIs, up to 90.2%. Slower thermal cis−trans relaxation is experienced owing to a nonpolarity-assisted inversion mechanism. After 15 repetitive trans−cis−trans switching cycles, an excellent stability up to 96.29% is recorded. The PI films obtained without any dilution in solid state reach the photostationary state after longer irradiation time but with excellent efficiency, up to 75.7%, and trans−cis−trans conversion stability, up to 92.68%, after 10 cycles. The photoisomerization studies are completed by 1 H NMR that evidences spectral profiles change during irradiation. Perspective optoelectronic applications that demand photocontrollable functions are foreseen.

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Section: Introductionmentioning

confidence: 99%

Structural Chemistry-Assisted Strategy toward Fast Cis–Trans Photo/Thermal Isomerization Switch of Novel Azo-Naphthalene-Based Polyimides

Constantin¹,

Sava²,

Damaceanu³

2021

Macromolecules

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“…Stdi close to 1 indicates that the sample surface is isotropic, with a random surface texture that does not have any texture that stands out, with no preferential orientation and presenting identical characteristics regardless of the direction of measurement. Meanwhile, Stdi close to zero shows a dominant direction of the surface morphology [ 14 , 57 ]. This can indicate an oriented surface or a periodic structure.…”

Section: Resultsmentioning

confidence: 99%

“…The first method is the most used due to the better control of sequence chromophore distribution. The azobenzene-functionalized monomers can be the diamines or dianhydrides or both of them [ 3 , 12 , 13 , 14 , 15 , 16 ]. Many azodiamines have been obtained and used for the synthesis and characterization of the azopolyimides, usually containing substituted or unsubstituted azobenzene side chains.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the azo-polymer photo-fluidization due to the above-described phenomenon can appear in the exposed regions [ 20 , 21 ]. Moreover, the cyclic photo-isomerization can lead to a large-scale mass transport of the polymer chains, which appear as a surface relief grating (SRG) [ 13 , 14 , 22 , 23 ]. Mainly, this mass displacement can take place from UV laser-exposed areas to the unexposed areas.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Local Mechanical and Chemical Properties via AFM as a Tool for Understanding the Formation Mechanism of Pulsed UV Laser-Nanoinduced Patterns on Azo-Naphthalene-Based Polyimide Films

Stoica¹,

Epure

Constantin³

et al. 2021

Nanomaterials

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Aromatic polyimides containing side azo-naphthalene groups have been investigated regarding their capacity of generating surface relief gratings (SRGs) under pulsed UV laser irradiation through phase masks, using different fluencies and pulse numbers. The process of the material photo-fluidization and the supramolecular re-organization of the surface were investigated using atomic force microscopy (AFM). At first, an AFM nanoscale topographical analysis of the induced SRGs was performed in terms of morphology and tridimensional amplitude, spatial, hybrid, and functional parameters. Afterward, a nanomechanical characterization of SRGs using an advanced method, namely, AFM PinPoint mode, was performed, where the quantitative nanomechanical properties (i.e., modulus, adhesion, deformation) of the nanostructured azo-polyimide surfaces were acquired with a highly correlated topographic registration. This method proved to be very effective in understanding the formation mechanism of the surface modulations during pulsed UV laser irradiation. Additionally to AFM investigations, confocal Raman measurements and molecular simulations were performed to provide information about structured azo-polyimide chemical composition and macromolecular conformation induced by laser irradiation.

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“…To increase the thermal stability of optically induced birefringence the combination of high glass transition temperature (Tg) polymers, such as polyimides, was used by many authors. [9][10][11][12][13][14] The incorporation of azobenzene chromophore into the polymers can introduce structural diversity and processability into the functional materials. Laser-induced surface relief gratings on azobenzene polymer films have attracted considerable attention since first reported by different authors.…”

Section: Introduction *mentioning

confidence: 99%

Investigation of surface relief gratings on azo-copolyimide films using atomic force microscopy

Sava¹,

Stoica²,

Mihăilă³

et al. 2021

Rev.Roum.Chim.

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Azo-copolyimide films were explored regarding the surface relief gratings formation under the action of pulsatory laser irradiation. The azo-copolyimides have been synthesized by the polycondensation reaction of benzophenonetetracarboxylic dianhydride and a mixture of two diamines, one of which contains substituted phenyl groups and the other one contains two pendent substituted azobenzene group, taken in the molar ratio 3 : 1, respectively. Atomic force microscopy was used to investigate the surface relief gratings characteristics in different conditions and for different structures of the azo-copolyimide films.

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Photoinduced properties of “T-type” polyimides with azobenzene or azopyridine moieties

Cited by 11 publications

References 57 publications

Structural Chemistry-Assisted Strategy toward Fast Cis–Trans Photo/Thermal Isomerization Switch of Novel Azo-Naphthalene-Based Polyimides

Structural Chemistry-Assisted Strategy toward Fast Cis–Trans Photo/Thermal Isomerization Switch of Novel Azo-Naphthalene-Based Polyimides

Evaluation of Local Mechanical and Chemical Properties via AFM as a Tool for Understanding the Formation Mechanism of Pulsed UV Laser-Nanoinduced Patterns on Azo-Naphthalene-Based Polyimide Films

Investigation of surface relief gratings on azo-copolyimide films using atomic force microscopy

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