Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Improvement of the Photochromic Properties of WO3-Based Composite Films by Phosphorus Addition
Hidetoshi MiyazakiTakumi IshigakiHisao SuzukiToshitaka Ota
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2014 Volume 87 Issue 7 Pages 838-841


Phosphorus tungstic heteropolyacid was synthesized by mixing P2O5 and peroxoisopolytungstic acid (W-IPA) in methanol solution. WO3-based composite films fabricated from phosphorus tungstic heteropolyacid and transparent urethane resin showed reversible photochromic properties. The coloring reaction rate constants of the films with P/W ratios of 0, 0.05, 0.083, and 0.20 were 1.55 × 10−2, 1.29 × 10−2, 1.88 × 10−2, and 1.76 × 10−2 min−1, respectively, while the bleaching half-life periods τ were 21.5, 14.9, 12.6, and 10.2 h, respectively; thus, the bleaching speed of the composite films was accelerated by phosphorus addition.

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© 2014 The Chemical Society of Japan
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