Abstract
Thin films of 1,2–polybutadiene were crosslinked by exposure to filtered UV (ultraviolet) radiation at 365 nm in the presence of benzophenone (BP) as photoinitiator. By means of FTIR (Fourier transform infrared) spectra recorded during irradiation, the partial loss of both unsaturation and allylic hydrogen was observed. The photoreduction of BP was continuously monitored through the infrared absorption of its carbonyl bonds at 1665 cm−1. The presence of a labile hydrogen atom, as well as of the vinyl group, ensured different reactivity toward triplet BP and led to a structural variety of the photoproducts, from which the main chemical reactions leading to photocrosslinking of 1,2-polybutadiene could be deduced. It was found that the homopolymerization of vinyl groups takes place simultaneously with the BP—induced crosslinking and that all BP originating products are bonded into the network of crosslinked chains. The obtained networks were characterized with respect to their insolubility and structural properties.
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