Novel photochromic materials, H 3 PW 11 MoO 40 /Poly (vinyl alcohol) (PVA) ultra-fine fibre mats containing different weight percentages of H 3 PW 11 MoO 40 , have been prepared from different H 3 PW 11 MoO 40 /PVA solutions by an electrospinning technique. IR spectroscopy, wide-angle x-ray diffraction, and scanning electron microscope spectroscopy are used to characterize the fibre mats. Results of viscosity and conductivity measurements of the solutions indicate that lower viscosity and higher conductivity favour the formation of thin fibres without beads. When irradiated with ultraviolet light (313.2 nm), the colour of the fibre mats changes from white to blue, and the mats show reversible photochromism. IR and ESR spectra of the irradiated fibre mats indicate a conceivable photochromic mechanism, i.e. Mo VI is reduced under ultraviolet irradiation. Meanwhile, PVA is oxidized to unsaturated ketone or aldehyde.
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Yang et al. (2004) studied this question.
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