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Photoinitiated Free Radical Polymerization Using Benzoxazines as Hydrogen Donors

✍ Scribed by M. Atilla Tasdelen; Baris Kiskan; Yusuf Yagci

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
163 KB
Volume
27
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: Free radical polymerization of methyl methacrylate (MMA) is initiated upon irradiation at λ > 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.

Schematic of the photoinitiated free radical polymerization using benzoxazines as hydrogen donors.

magnified imageSchematic of the photoinitiated free radical polymerization using benzoxazines as hydrogen donors.

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