Reactions of gaseous hydrogen peroxide with titanium isoproproxide-hydroxypropylcellulose films and coatings prepared through sol-gel formation were investigated. When exposed to peroxide vapors between 0 and 50 ppm, these films and coatings underwent a dramatic color change from clear to yellow within minutes. To determine the reaction kinetics, an experimental setup was developed to quantify the reflected light during exposure. The phenomenological reaction rate was first-order with respect to peroxide concentration and zero-order with respect to the titania loading, although lower loadings resulted in films which were not as colored and saturated faster with exposure. In addition, coatings produced on the cellulose substrate were over three times as sensitive as films produced on polycarbonate slides. Using this setup, reactions with various organic peroxides were investigated.  It was determined that increasing the acidity of the films and coatings significantly increased the sensitivity.

Reactions of hydrogen and organic peroxides with titania impregnated films and coatings

247th National Meeting (2014)

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