High refractive index coumarin-based photorefractive polysiloxanes

Schraub, Martin; Soll, Sebastian; Hampp, Norbert

doi:10.1016/j.eurpolymj.2013.03.021

Cited by 20 publications

(15 citation statements)

References 29 publications

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“…As already described in previous works a macroscopic model is necessary to determine the samples' optical constants by a nonlinear regression method. The sample is treated with a multilayer model: the Si substrate, the organic film, and an additional layer composed of a mixture of organic material and air describing the roughness of the film.…”

Section: Methodsmentioning

confidence: 99%

“…Refractive indices of organic compounds are usually reported in the literature for polymer‐based materials synthesized in view of technological applications in a wide range of industrial fields such as microelectronics, mechatronics, opto‐electronics, electro or magneto‐optics, or medical . Different techniques based on refractometers, spectroscopic ellipsometry, prism coupled methods, interferometry, or profile analyzers are used to measure the optical constants which are determined in the UV to near IR region . The refractive indices are generally found to be between 1.4 and 1.8 in the 250–1 200 nm range.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N₂-CH₄RF Plasma

Mahjoub

Carrasco

Dahoo

et al. 2014

Plasma Process. Polym.

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A RF CCP plasma discharge in N 2 /CH 4 mixture is used to produce organic films. Here is presented the influence of a cryogenic cooling during the film synthesis on the optical refractive indices. The optical indices in the visible range are determined by spectroscopic ellipsometry. It is shown that the optical absorption is lower for a material produced at low temperature (105 K) than at room temperature. The absorption decrease is assigned to nitrogen containing products depletion confirmed both by IR absorption spectroscopy of the film on the one hand and by mass spectrometry of the reactive gas phase on the other hand.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N₂-CH₄RF Plasma

Mahjoub

Carrasco

Dahoo

et al. 2014

Plasma Process. Polym.

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“…In addition, coumarins can undergo a 2+2 photo-dimerization upon irradiations at λ> 300 nm and then revert to the starting compound upon irradiations at λ < 300 nm [19]. Since this reversible photodimerization was first disclosed in 1902 [19], enormous studies concerning coumarins have been published due to their unique photochemistry [20][21][22][23][24][25]. Moreover, in recent years, applications of this reversible reaction have been explored where coumarins can be used as phototriggers for lightsensitive amphiphilic polymers.…”

Section: Introductionmentioning

confidence: 99%

Photo-induced dynamic association of coumarin pendants within amphiphilic random copolymer micelles

et al. 2014

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The water-soluble amphiphilic random copolymer of P(DMA-co-VBC) with coumarin pendants has been designed to investigate the photo-induced dynamic association of coumarin pendants within polymer micelles in aqueous solution. Methods of absorption and emission spectra, solution transmittance, dynamic light scattering (DLS), and atomic force microscope (AFM) were applied. It was found that P(DMA-co-VBC) can form polymer micelles in aqueous solution. The time-dependent photo-dimerization degree (PD) of polymer micelles upon different intensity irradiations of 320 nm light showed saturating behaviors with an intensityindependent value of the maximum photo-dimerization extent, while the maximum photo-cleavage extent of coumarin dimers declined with the increasing intensity of 254 nm irradiation at used conditions. Furthermore, a significant emission band at 445 nm (I 2 ) evidently emerged as against the disappearance of emission band at 385 nm (I 1 ) during the photodimerization, and the time-dependent I 2 /I 1 ratios of polymer aqueous solution upon alternative irradiations of 320 and 254 nm light showed a wave-like increase as a function of irradiation cycles, indicating a wavy closeness of coumarin pendants within polymer micelles during the reversible photodimerization cycles.

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“…Hampp and co-workers developed a light adjustable IOL whose refractive index could be adjusted postoperatively through a system based on coumarin-polymer. [10,[28][29][30] Changes in the refractive index are achieved by dimerizing (formation of a cyclobutane ring) or by cleaving coumarin functions in a [2+2] cycloaddition or cycloreversion. The formation or cleavage of cyclobutene ring modifies the polarizability of the system and leads to a change of the refractive index.…”

Section: Introductionmentioning

confidence: 99%

Photoreversibility and Biocompatibility of Polydimethylsiloxane‐Coumarin as Adjustable Intraocular Lens Material

Jellali

Bertrand

Alexandre

et al. 2017

Macromolecular Bioscience

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Polydimethylsiloxane (PDMS) constitutes an interesting material for a variety of biomedical applications, especially as intraocular lenses (IOLs), for its excellent transparency. In this work, a photoreversible PDMS-coumarin network, whose shape and properties can be adjusted postoperatively in a noninvasive manner, is developed. The synthesis of PDMS-coumarin is achieved by amidation of a coumarin acid chloride derivative with amine-functionalized PDMSs. Under exposure of λ > 300 nm, these polymers can be cured by dimerization of coumarin. The cured polymers can be uncrosslinked via photocleavage of cyclobutane dimers upon illumination at λ < 290 nm. The diffusion of linear PDMSs in a crosslinked network and the controlled shape modification are studied, which demonstrate that these polymers are good candidates for adjustable IOL application. IOL disks prepared from these materials show high hydrophobicity and good transparency. In vitro cytotoxicity, lens epithelial cell adhesion assays, and rabbit host reaction against implanted disks demonstrate the biocompatibility of the polymer.

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High refractive index coumarin-based photorefractive polysiloxanes

Cited by 20 publications

References 29 publications

Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N₂-CH₄RF Plasma

Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N₂-CH₄RF Plasma

Photo-induced dynamic association of coumarin pendants within amphiphilic random copolymer micelles

Photoreversibility and Biocompatibility of Polydimethylsiloxane‐Coumarin as Adjustable Intraocular Lens Material

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High refractive index coumarin-based photorefractive polysiloxanes

Cited by 20 publications

References 29 publications

Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N2-CH4RF Plasma

Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N2-CH4RF Plasma

Photo-induced dynamic association of coumarin pendants within amphiphilic random copolymer micelles

Photoreversibility and Biocompatibility of Polydimethylsiloxane‐Coumarin as Adjustable Intraocular Lens Material

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Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N₂-CH₄RF Plasma

Effect of the Synthesis Temperature on the Optical Indices of Organic Materials Produced by N₂-CH₄RF Plasma