科研之友
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摘要
The effect of UV radiation on both pure and additive-containing polyaniline thin films is described. Experimental investigations included optical transmittance spectroscopy and electrical conductivity measurements. Exposure to UV radiation in the range of 380 to 400 nm was seen to increase film transmittance by 4% through photobleaching. Different gas ambients were employed for this experiment and progressively more photobleaching was observed for nitrogen, air and oxygen atmospheres. This effect arises due to the destruction of quinoid and benzenoid chromophores on the polymer backbone. Concomitantly, a decrease in film resistivity was also observed and this can be attributed to increased oxidative doping of the film material. The addition of controlled amounts of Tinuvin 213-an ultraviolet absorber (UVA) material-was seen to reduce the UV-induced degradation of polyaniline thin films by absorption of UV photons through regenerative intramolecular photolysis.
- 出版日期2010-4
