Abstract
AbstractN‐(3‐Dimethylaminopropyl) acrylamide (DMAPAA) and N‐(3‐dimethylaminopropyl) methacrylamide (DMAPMA) were prepared and polymers with pendant amino groups were synthesized via copolymerization of methyl methacrylate (MMA) with DMAPMA. With benzophenone (BP) as a sensitizer, the photo‐grafting reaction of acrylonitrile (AN) onto poly(MMA‐co‐DMAPMA) was investigated. The formation of a graft copolymer is confirmed by means of IR spectroscopy, elemental analysis and viscometry. The photoreaction of BP with polymers having pendant amino groups was studied by means of electron paramagnetic resonance (EPR) spectroscopy. It revealed that an alkylaminomethylene radical and a semipinacol radical are produced by the photoreaction. Amino end‐group analysis also proved that the radical formed from the amino component can initiate radical polymerization. Based on the EPR studies and amino end group analysis, the photo‐grafting reaction mechanism is proposed.
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