Visible light induced polymerization of maleimide-vinyl and maleimide-ally ether based systems

摘要

The photoinitiated polymerization reaction of maleimde-vinyl ether and maleimide-allyl ether under visible light in the presence of several visible photoinitiating systems have been investigated.Remarkable hight rates of polymerization with nearly 100% of conversions are obtained.Photoinitiator free polymerization of maleimide-allyl ether systems exhibits also a quite good efficiency,comparable to that of maleimide-vinyl ether.Photoinitiators working through hydrogen abstraction like camphorquinone were shown to be able to initiate very well the visible curing of amleimide-allyl ether.The curing of a maleimide-allyl or vinyl ether formulation can be achieved within I s in the presence of a 4-component photoinitiating system under low light intensity.The role of a large variety of photoinitiating systems and the mechanisms involved in the initiation step are discussed.