Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 27, Issue 18, Pages 1539-1544Publisher
WILEY-BLACKWELL
DOI: 10.1002/marc.200600424
Keywords
benzoxazine; hydrogen abstraction; photopolymerization; ring opening polymerization
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Free radical polymerization of methyl methacrylate (MMA) is initiated upon irradiation at lambda > 350 nm in CH(2)Cl(2) that contains benzoxazine (P-a) and one of the following photosensitizers: benzophenone (BP), thioxanthone (TX), 2-chlorothioxanthone (CTX), 2-isopropyl thioxanthone (ITX), and camphorquinone (CQ). The postulated mechanism is based on the intermolecular reaction of the excited photosensitizer with the tertiary amino moiety of the ground state P-a and a subsequent hydrogen abstraction reaction. The resulting aminoalkyl radicals initiate the polymerization. The incorporation of P-a groups into polymers is demonstrated by spectroscopic methods. The possibility of deep curing using the described photoinitiating system followed by the thermal ring opening of the incorporated P-a groups is also demonstrated.
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