Journal ArticleDOI
Photochromic behavior of copolymers of indolinospirobenzopyrane methacrylic derivatives
J. Verborgt,Georges Smets +1 more
TLDR
In this article, photochromic 3,3-dimethyl-6′-nitroindolinospirobenzopyran methacrylic derivatives have been synthesized.Abstract:
Three photochromic 3,3-dimethyl-6′-nitroindolinospirobenzopyran methacrylic derivatives have been synthesized, namely, 1-methyl 8′-methacryloxymethyl (A), 1-(β-methacrylamidoethyl) (B), and 1-(β-methacryloxyethyl) (C). They have been copolymerized with methyl, isobutyl, and n-propyl methacrylates. The photochromic behavior of these copolymers in the solid state has been compared to that of the homologous isobutyric compounds dissolved in corresponding polymeric matrices. The kinetics of decoloration were resolved in three simultaneous first-order reactions with rate constants k1, k2, and k3. The influence of the polarity of the polymeric matrix and of the photochrome incorporation has been examined. The rates of decoloration of the copolymers with isobutyl and n-propyl methacrylate are very sensitive to the glass transition temperature Tg; the activation energy of decoloration increases markedly above Tg, from 19.8 to 36.5 kcal; below Tg the entropy of activation is strongly negative (around -20 e.u.), above Tg strongly positive. These effects are interpreted on the basis of an increasing chain segment mobility above Tg.read more
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Journal ArticleDOI
Spiropyran-based dynamic materials
TL;DR: This review discusses the synthesis, switching conditions, and use of dynamic materials in which spiropyran has been attached to the surfaces of polymers, biomacromolecules, inorganic nanoparticles, as well as solid surfaces.
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Isomerization of aromatic azo chromophores in poly(ethyl acrylate) networks and photomechanical effect
TL;DR: In this article, the photochemical and thermal cis-trans isomerization of azo chromophores which were either dissolved, a pendant group or part of a crosslink in rubbery poly(ethyl acrylate) networks has been investigated.
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Diffusion-Controlled Reactions in Polymer Systems
Itaru Mita,Kazuyuki Horie +1 more
TL;DR: In this article, the process of bimolecular reaction between A and B is given by Eq. (1), taking into account the diffusion step bringing the two reactions in proximity.
Book ChapterDOI
Photochromic phenomena in the solid phase
TL;DR: In this article, photochromic phenomena occurring in the solid phase are discussed first from the point of view of the influence of a polymer medium on the photo chromic behavior and reaction reversibility.
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Luminescent probe studies of the microstructure and mobility of solid polymers
TL;DR: In this article, caracteristiques des sondes luminescentes et phosphorescentes, melanges de polymeres and separation de phase, coefficient de diffusion d'une molecule de polymere dans l'etat solide, les temperatures de transition Tg, Tβ et Tγ, volume libre.