High‐Content Photochromic Polymers Based on Dithienylethenes

Wigglesworth, Tony J.; Myles, Andrew J.; Branda, Neil R.

doi:10.1002/ejoc.200400623

Cited by 76 publications

(44 citation statements)

References 36 publications

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“…Some examples of these stimuli include heat, [1][2][3][4][5][6][7][8][9] deformation, [10][11][12][13][14][15][16][17][18][19][20] chemicals, [21][22][23] light, [24][25][26] and others, [27,28] which make the sensors useful for a wide range of technologies. [29,30] We recently reported on a new class of polymers with built-in optical deformation [31][32][33][34][35] and threshold temperature [33,34,36] sensors.…”

Section: Introductionmentioning

confidence: 99%

Threshold Temperature Sensors with Tunable Properties

Crenshaw

Kunzelman

Sing

et al. 2007

Macro Chemistry & Physics

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Thermochromic polymer/dye blends based on small amounts (0.6–2.3 wt.‐%) of chromogenic sensor dyes and glassy amorphous polymers were prepared. Subjecting melt‐processed, quenched blends to temperatures above Tg leads to permanent and pronounced changes of their absorption and fluorescence spectra as a result of phase separation and assembly of dye aggregates. The influence of dye structure and polymer Tg on the aggregation kinetics of these blends was investigated. It is shown that increasing the length of the dye's rigid core leads to slower aggregation rates due to limited mobility in the polymer. The threshold of the color change can be tailored by adjusting the polymer Tg, as was shown by the systematic investigation of blends based on poly(alkyl methacrylate) copolymers of varying composition.magnified image

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Section: Introductionmentioning

confidence: 99%

Threshold Temperature Sensors with Tunable Properties

Crenshaw

Kunzelman

Sing

et al. 2007

Macro Chemistry & Physics

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“…To achieve such goals, we proposed backbone photochromic polymers, where the photochromic units are part of the polymer main chain [11][12][13]. In particular, it has been shown that polyurethanes are good candidates, showing good resistance to solvents and allowing for versatile polymerization and processing.…”

Section: Introductionmentioning

confidence: 99%

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

et al. 2017

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Photochromic polymers have been studied as rewritable systems for optical elements with tunable transparency in the visible and refractive index in the NIR. Six diarylethene monomers have been synthesized to give thin films of photochromic polyurethanes. The absorption properties of the monomers in solution and of the corresponding polymeric films have been evaluated showing that a transparency contrast in the visible spectrum of the order of 10 3 can be obtained by a suitable choice of the chemical structure and illumination wavelength. The change in the refractive index in the NIR have been determined by ellipsometry showing changes larger than 10 −2 . A trend of this variation with the absorption properties has been also highlighted. Fresnel lenses working on the basis of both a change of the transparency and the refractive index (amplitude and phase) have been demonstrated.

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“…6.1.1.2 Reactions Involving Carbon-Carbon Bond Cleavage: Diarylethenes (DTEs), Fulgides, and Fulgimides The photogenerated isomers of diarylethenes (DTEs) and fulgides are thermally irreversible (P-type) and lend themselves to being very useful photochromic switches because they exhibit bistability and high quantum efficiencies for forward and reverse reactions [7,27,28]. DTEs exhibit better fatigue resistance and have higher durability than fulgides.…”

Section: Examples Of Photochromic Systemsmentioning

confidence: 99%