Abstract
The major product of the irradiation of benzaldehyde vapour at 366 nm and at 338 K and 353 K is a yellowish polymer. Trace quantities of CO, benzene and toluene are also formed. Under the initial conditions the rate of pressure decrease is first order with respect to the incident light intensity and about 1/2 order with respect to the benzaldehyde concentration. Although the quantum yields for benzaldehyde disappearance lie in the range 0.8 – 2.1, these correspond to quantum yields for photopolymer formation of only 0.07 – 0.71. Possible initiation mechanisms are discussed.
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