Abstract
Photopolymerization of pentaerythritol triacrylate in poly(methylmethacrylate) (PMMA) film using a series of dimethylphenacylsulfonium butyltriphenylborate initiators was investigated. Photopolymerization was studied using real time Fourier transform infrared spectroscopy (RT-FTIR) by irradiating UV light at 365nm. When two aromatic ketones, 2, 4-diethylthioxanthone and 4, 4′-bis(diethylamino)benzophenone, were used as sensitizers, the rate of polymerization (Rp) for the sulfonium borate was higher than for the corresponding sulfonium salt and ammonium borate. The Rp value increased with increasing the reduction potential of the sulfonium cations of the sulfonium borates. The photoreaction between the sulfonium borates and the sensitizers occurred through a photoinduced electron transfer.
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