Experimental study of sensitized photooxidation reaction of compounds with anthracene structure in poly(methyl methacrylate)

Попов, А. П.; Shelekhov, N. S.; Bandyuk, O. V.; Ratner, O. B.; Vember, T. M.; Rebezov, A. O.; Lashkov, G. I.

doi:10.1007/bf00519199

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…The chemical mechanism is shown in Figure . Light exposure in the presence of ambient O 2 produces an endoperoxide form of DBA by (4π + 2π) cycloaddition with singlet oxygen . Subsequent heating yields free radicals that chemically modify the PiBMA film in a number of potential ways.…”

Section: Resultsmentioning

confidence: 99%

Surface energy gradient driven convection for generating nanoscale and microscale patterned polymer films using photosensitizers

Kim

Janes

McGuffin

et al. 2014

J. Polym. Sci. Part B: Polym. Phys.

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The Marangoni effect describes how fluid flows in response to gradients in surface energy. This phenomenon could be broadly harnessed to pattern the surface topography of polymer films if generalizable techniques for programming surface energy gradients existed. Here, a near UV–visible light (NUV–vis) photosensitizer, 9,10‐dibromo‐anthracene (DBA), was doped into thin films of a model polymer, poly(isobutyl methacrylate). After exposure to light through a photomask and heating above the glass transition, thermolysis of photo‐oxidized DBA and grafting to the polymer promoted flow of the film material into the exposed regions. This mechanism did not significantly alter the molecular weight of PiBMA or the film's glass transition temperature, but resulted in an increase in film surface energy as indicated by a decrease in water contact angle. Film height variations of 580 nm were produced using a mask with 12.5 μm features; a mask with 800 nm features was also employed to generate topographic features of corresponding width without expensive contacting equipment. Due to the broad absorbance spectra of DBA, highly accessible and/or unconventional light sources may be employed in this process; this advantage was demonstrated by patterning with sunlight. The nonspecific radical‐mediated nature of the DBA grafting reaction makes this a promising approach for many classes of polymers. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 1195–1202

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Section: Resultsmentioning

confidence: 99%