Photochromic copolymers containing 3-indolylfulgides/indolylfulgimides: synthesis and photochemical properties in toluene and as films
| Autor: | Nadezhda I. Islamova, Chang-Jun Fan, Richard S. Andino, Watson J. Lees, Xi Chen |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Polymer Condensed Matter Physics Photochemistry Toluene Article Styrene chemistry.chemical_compound Photochromism Monomer chemistry Mechanics of Materials Polymer chemistry Materials Chemistry Copolymer Methyl methacrylate Isomerization |
| Zdroj: | Polymer degradation and stability. 98(9) |
| ISSN: | 0141-3910 |
| Popis: | Photochromic indolylfulgimides covalently attached to polymers have beneficial properties for optical switching. A 3-indolylfulgide and two 3-indolylfulgimides with one or two polymerizable styrene groups attached on the nitrogen atom(s) were synthesized. Copolymerization with methyl methacrylate (MMA) provided linear copolymers (one styrene group) or a cross-linked copolymer (two styrene groups). The properties of the monomers and copolymers in toluene or as thin films were characterized. The new copolymers were photochromic (reversible Z-to-C isomerization), absorbed visible light, and revealed good thermal and photochemical stability. At room temperature, all copolymer films showed no loss of absorbance after 5 weeks. At 80 °C in either toluene or as films, the Z-forms copolymers were less stable than the C-form copolymers, which showed little or no degradation after 400 h. The degradation rate due to repeated ring-closing – ring opening cycles was less than 3% per 100 cycles. The cross-linked copolymer showed photochemical stability comparable to monomeric fulgides in toluene |
| Databáze: | OpenAIRE |
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