Photoinitiated polymerization of multifunctional monomers
Polimery 2001, No 2, 88
This review article is devoted to the radical photopolymerization of multifunctional (met)acrylates. The main emphasis was laid on the effect of a heteroatom (S or O) present in the monomer (general formula IV) or an additive molecule, such as linear or cyclic sulfid [e.g. formula (III)], on the photopolymerization, including temperature behavior, initiation and termination mechanisms as well as side reaction e.g. reinitiation or degradation. The influence of the heteroatom present in the monomer or the additive molecule is advantageous both for the polymerization rate as well as for the double bond conversion, especially in air. This effect is much stronger for the sulfide than the ether group. Generally, the effect of the hetero atom is a result of various accelerating and decelerating processes associated with hydrogen abstraction reaction [e.g. equation (7)]. The occurrence and relative importance of these processes depend on polymerization conditions and the structure of additive used.
Keywords: radical photopolymerization, multifunctional (meth)acrylates, polymerization kinetics, (meth)acrylates with sulfide or ether group, apliphatic sulfides