Photoconductive films of poly-N-vinylindole-based blends for high-voltage photorefractive electrooptic cells

Castè, Claudia; Castelvetro, Valter; Ciardelli, Francesco; Colligiani, A.; Mazzotta, A.; Michelotti, D.; Ruggeri, Giacomo; Veracini, C. A.

doi:10.1016/s0379-6779(03)00035-3

Cited by 15 publications

(4 citation statements)

References 11 publications

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“…[45] Investigation of polymer photoconducting, photorefractive, and non-linear optical properties is still in progress and will constitute the subject of a forthcoming paper. …”

Section: Resultsmentioning

confidence: 99%

“…Because of the presence of a large number of chromophores endowed with non‐linear optical properties neighboring charge‐transfer centers, some of the investigated systems could be exploited as photorefractive materials 45. Investigation of polymer photoconducting, photorefractive, and non‐linear optical properties is still in progress and will constitute the subject of a forthcoming paper.…”

Section: Resultsmentioning

confidence: 99%

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Photoactive Azobenzene Polymers Containing Carbazole Chromophores

Altomare

Ciardelli

Mellini

et al. 2004

Macro Chemistry & Physics

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Polymeric systems containing side-chain photoactive chromophores were prepared by free-radical copolymerization of N-vinylcarbazole with 4-methacryloyloxyazobenzene and 4-methacryloyloxy-4'-cyanoazobenzene. The resulting materials were characterized by size exclusion chromatography, TGA and DSC thermal analysis, FT-IR, H-1 NMR, UV-vis, and fluorescence spectroscopy and photoisomerization experiments. In all cases, the copolymer composition was almost independent of the feed composition, in agreement with the strong tendency of the investigated monomers to alternating copolymerization. Spectroscopic and thermal data clearly highlighted the occurrence of charge-transfer electronic interactions between electron-rich carbazole rings and electron-poor azobenzene chromophores. These interactions facilitate the trans-cis photoisomerization of azobenzene side-chains

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“…[45] Investigation of polymer photoconducting, photorefractive, and non-linear optical properties is still in progress and will constitute the subject of a forthcoming paper. …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Photoactive Azobenzene Polymers Containing Carbazole Chromophores

Altomare

Ciardelli

Mellini

et al. 2004

Macro Chemistry & Physics

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“…Polymers containing carbazole groups have been extensively studied and employed in photoconductivity and photorefractive materials owing to its excellent photoconductivity properties. 14,15 Nevertheless, in spite of the good results, carbazole-based materials suffer from some drawbacks that can limit their technical applications. These drawbacks concern the very high glass transition temperature of the related polymers, the poor availability, and the carbazole high molecular symmetry.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of highly organosoluble aromatic polyimides containing N-(4-(di(1H-indole-3-yl)methyl)phenyl) moieties

Khalili

Rafiee

2019

High Performance Polymers

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A new diamine monomer containing indole unit, 3,5-diamino- N-(4-(di(1H-indol-3-yl)methyl)phenyl)benzamide, was successfully synthesized and applied in the preparation of a series of polyimides (PIs) via a conventional two-step polymerization procedure with three aromatic tetracarboxylic dianhydrides. The prepared polymers showed excellent solubility in organic solvents such as N-methyl-2-pyrrolidinone (NMP), N, N-dimethylacetamide, and N, N-dimethylformamide. Flexible and strong films of PIs were obtained via casting from their solutions. The glass transition temperature of these polymers was in the range of 223–264°C. They were fairly stable up to a temperature around 300°C and lost 10% weight at 372°C in nitrogen atmosphere. All of the polymers revealed absorption maxima around 323 nm with a fluorescence emission maxima around 378–406 nm in NMP. The cyclic voltammetry of the PIs exhibited an oxidation wave with a peak at 1.07 V. The resulting polymer films had tensile strengths from 83 MPa to 107 MPa, elongates at break of 7–10%, and tensile moduli of 2.2–2.3 GPa.

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“…Therefore, the quality of resulting composite is directly bound to the amount of SWNTs and the choice of the reactionnal medium and method. In parallel, it was shown that Poly(N-vinylcarbazole) (PVK) is an attractive polymer owing to its photoconductive properties (Caste et al, 2003;Tang et al, 2008) and it has be used in xerographic systems (Moisan et al, 1991). This non-conjugated polymer is currently used as a good hole transporting material in photovoltaic devices (Barlier et al, 2009) or as a luminescent polymer emitting in the blue part when prepared in nanoparticles (Yoon et al, 2008).…”

Section: Introductionmentioning

confidence: 99%