The synthesis and subsequent thiol-alkene photopolymerization of a tetrafunctional alkene monomer based on a thiol-benzoxazine reaction is reported. An allyl-functional benzoxazine was reacted with pentaerythritol tetra(3-mercaptopropionate) (PETMP) to form a tetrafunctional alkene monomer (PETMP-4ene) with pendent phenols. The effect of the PETMP-4ene monomer concentration on the thermomechanical properties, tensile properties and thermal stability of a ternary thiol-alkene system consisting of PETMP and triallyl isocyanurate (TTT) was evaluated using DMA, tensile testing and TGA, respectively. Photopolymerization kinetics were monitored using real-time FTIR. Increasing the loading concentration of PETMP-4ene led to a decrease in glass transition temperature, a decrease in initial thermal stability, an increase in char yield and an increase in toughness. The changes in thermomechanical properties are presented in terms of crosslink density and functional group conversions.

Ternary thiol-ene photopolymerizations using multifunctional monomers derived from the thiol-benzoxazine reaction

245th National Meeting (2013)

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