Preparation, Photochromic Properties of Keggin Type Tungstophosphoric Acids Based on Polyacrylamide

Abstract

Abstract: A new photochromic complex of Keggin type Tungstophosphate acid/polyacrylamide system was prepared in aqueous solution, and its thin films was made by the dip-coating technique. Their properties were investigated by FT-IR, UV-Vis, as well as TG-DTA measurement. The results showed that this type of system had different properties in solution and in thin films. ESRspectra g values for the one-electron blues were the characteristic of tetragonal W⁵⁺ complex in aqueous solution and thin films. The formation of a radical signal of ESRspectra indicated that polyacrylamide was a proton donor, the reversibility for photochromism was relative to the presence and diffusion of oxygen in polymeric network.

Key words: 12-Tungstophosphoric acid, Polyacrylamide, Photochromism, Proton donor, Diffusion-control

CLC Number:

O635

TrendMD:

FENG Wei, ZHAGN Tie-Rui, LIU Yan, LU Ran, ZHAO Ying-Ying, YAO Jian-Nian. Preparation, Photochromic Properties of Keggin Type Tungstophosphoric Acids Based on Polyacrylamide[J]. Chem. J. Chinese Universities, 2000, 21(10): 1563.

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Preparation, Photochromic Properties of Keggin Type Tungstophosphoric Acids Based on Polyacrylamide

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