Rapid Decoloration of Photochromic 3H-Naphthopyran Attached to Three-Dimensional Poly(dimethylsiloxane) Network
| Autor: | Masako Saito, Yasushi Yokoyama, Ken-ichiro Hiwatari, Takashi Ubukata, Yasushi Ozawa |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Hydrosilylation
Doping 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Elastomer 01 natural sciences 0104 chemical sciences Reaction rate chemistry.chemical_compound Photochromism chemistry Degradation (geology) Molecule 0210 nano-technology |
| Zdroj: | Bulletin of the Chemical Society of Japan. 91:563-570 |
| ISSN: | 1348-0634 0009-2673 |
| DOI: | 10.1246/bcsj.20170396 |
| Popis: | The attachment of 3H-naphthopyran to a three-dimensional network of polysiloxane elastomer was carried out by hydrosilylation reactions using 3H-9-(5-hexenyloxy)naphthopyran. The photochemical coloration and subsequent thermal decoloration behaviors of polysiloxane-bound 3H-naphthopyran molecules were examined by comparing their properties with those of a model 9-hexyloxy-3H-naphthopyran compound doped in a polysiloxane film, a PMMA film, and in solutions. The decoloration reaction rate of polysiloxane-bound naphthopyran was basically the same as that in the polysiloxane-doped system and in solutions. However, the polysiloxane-bound system is superior to the doped system due to: (1) more concentrated incorporation of naphthopyran molecules in the polysiloxane film; (2) less degradation of naphthopyran molecules during film preparation; and (3) less temperature dependence in the thermal decoloration rate. |
| Databáze: | OpenAIRE |
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