Thermal, optical and photoinduced properties of a series of homo and co-polyimides with two kinds of covalently bonded azo-dyes and their supramolecular counterparts

Konieczkowska, Jolanta; Wójtowicz, Magdalena; Sobolewska, Anna; Noga, Joanna; Jarczyk-Jedryka, Anna; Kozanecka-Szmigiel, Anna; Schab‐Balcerzak, Ewa

doi:10.1016/j.optmat.2015.07.033

Cited by 21 publications

(9 citation statements)

References 56 publications

(95 reference statements)

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“…The highest obtained SRG modulation depth was 28 nm. 31 This value is similar to the lower modulation depth value of our heterocyclic azo polymers (P6(OCH 3 )) and 4 times lower than the highest modulation depth value of our heterocyclic azo polymers (P5(CH 3 )). Borger and co-workers investigated surface relief grating formation of a series of azobenzene-containing polymers with varying molecular weight.…”

Section: Surface Relief Grating Inscriptionsupporting

confidence: 86%

Photoresponsive Behavior of Heterocyclic Azo Polymers with Various Functional Groups

et al. 2019

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Here, we report on efficiency of light-induced processes in a series of methacrylic polymers containing heterocyclic azo moieties covalently attached to the polymer backbone. The optical response of the polymers was investigated in experiments on photoinduced birefringence measurements and surface relief gratings inscription upon irradiation with polarized blue light. The experimental results indicate that the presence of acceptor-type (Br) substituent in the side benzene ring linked to the heterocyclic ring has a beneficial effect on efficiency of birefringence generation, while incorporation of donor-type (CH3, OCH3) substituents lowers the level of photoinduced birefringence. Moreover, the process of surface relief structure formation was successfully observed for all studied polymers. The obtained surface-modulation depth reached up to 100 nm for two out of four investigated materials. No straightforward relation between the induced azo chromophore alignment level and the efficiency of mass-transport process is observed.

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Section: Surface Relief Grating Inscriptionsupporting

confidence: 86%

Photoresponsive Behavior of Heterocyclic Azo Polymers with Various Functional Groups

et al. 2019

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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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“…However, the stability and durability of its composition materials have a restriction in its application, especially in wearable devices. Konieczkowska and co-workers have made some explorations in this regard by introducing AzPy into the polymer main chain or crosslinker to form an elastomer [125][126][127]. Finally, based on the improved mechanical properties and precise modulations of AzPy materials, they may have extensive application prospects in the field of 4D printing.…”

Section: Discussionmentioning

confidence: 99%

Recent Progress in Azopyridine-Containing Supramolecular Assembly: From Photoresponsive Liquid Crystals to Light-Driven Devices

Ren

Yang

2022

Molecules

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Azobenzene derivatives have become one of the most famous photoresponsive chromophores in the past few decades for their reversible molecular switches upon the irradiation of actinic light. To meet the ever-increasing requirements for applications in materials science, biomedicine, and light-driven devices, it is usually necessary to adjust their photochemical property from the molecular level by changing the substituents on the benzene rings of azobenzene groups. Among the diverse azobenzene derivatives, azopyridine combines the photoresponsive feature of azobenzene groups and the supramolecular function of pyridyl moieties in one molecule. This unique feature provides pH-responsiveness and hydrogen/halogen/coordination binding sites in the same chromophore, paving a new way to prepare multi-functional responsive materials through non-covalent interactions and reversible chemical reactions. This review summarizes the photochemical and photophysical properties of azopyridine derivatives in supramolecular states (e.g., hydrogen/halogen bonding, coordination interactions, and quaternization reactions) and illustrates their applications from photoresponsive liquid crystals to light-driven devices. We hope this review can highlight azopyridine as one more versatile candidate molecule for designing novel photoresponsive materials towards light-driven applications.

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Thermal, optical and photoinduced properties of a series of homo and co-polyimides with two kinds of covalently bonded azo-dyes and their supramolecular counterparts

Cited by 21 publications

References 56 publications

Photoresponsive Behavior of Heterocyclic Azo Polymers with Various Functional Groups

Photoresponsive Behavior of Heterocyclic Azo Polymers with Various Functional Groups

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

Recent Progress in Azopyridine-Containing Supramolecular Assembly: From Photoresponsive Liquid Crystals to Light-Driven Devices

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