Novel hybrid inorganic-organic film based on the tungstophosphate acid-polyacrylamide system: Photochromic behavior and mechanism

Wei Feng; Tie Rui Zhang; Yan Liu

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Novel hybrid inorganic-organic film based on the tungstophosphate acid-polyacrylamide system: Photochromic behavior and mechanism

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A novel photochromic complex composed of Keggin-type tungstophosphate acid (PW_(12)) and polyacrylamide (PAM) was prepared. Atomic force microscopy (AFM), thermogravimetric study, Fourier transform infrared spectra (FTIR), ultraviolet-visible absorption spectra (UV-VIS), and electron resonance spectra (ESR) were used to investigate the surface topography, composition, and photochromic behavior and mechanism of the film. Under UV irradiation, the film was reduced photochemically to yield a blue species. AFM images indicated that surface topography of the polymer matrix changed after adding PW_(12). FTIR results showed that the Keggin geometry of PW_(12) was still preserved inside the matrix, and a charge-transfer bridge was built between PW_(12) and PAM by hydrogen bonding. The characteristic signal of W(V) and the formation of a radical signal in ESR spectra indicated that PAM was a hydrogen donor and the photoreduced process was in accordance with the radical mechanism. The diffusion of oxygen in the polymeric network plays an important role in the reversibility of Photochromism.

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《Journal of Materials Research》 |2002年第1期|133-136|共4页
作者
Wei Feng; Tie Rui Zhang; Yan Liu;
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作者单位

Fachbereich Physik, Universitat Kassel, 34109 Kassel, Germany;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
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Novel hybrid inorganic-organic film based on the tungstophosphate acid-polyacrylamide system: Photochromic behavior and mechanism

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