Photoinitiated Free Radical Polymerization Using Benzoxazines as Hydrogen Donors

Macromolecular Rapid Communications


M. Atilla Tasdelen, Baris Kiskan, Yusuf Yagci


Free radical polymerization of methyl methacrylate (MMA) is initiated upon irradiation at > 350 nm in CH2Cl2 solution containing benzoxazine (P-a) and one of the following photosensitizers: benzophenone (BP), thioxanthone (TX), (CTX), 2-isopropyl-thioxanthone (ITX) and camphorquinone (CQ). The postulated mechanism is based on the intermolecular reaction of excited photosensitizer with the tertiary amino moiety of the ground state P-a and subsequent hydrogen abstraction reaction. The resulting aminoalkyl radicals initiate the polymerization. Incorporation of P-a groups into polymers was demonstrated by spectroscopic methods. The possibility of deep curing using described photoinitiating system followed by the thermal ring opening of the incorporated P-a groups was also demonstrated.

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