Hybrid dual-cure polymer networks via sequential thiol-ene photopolymerisation and thermal ring-opening polymerization of benzoxazines

摘要

Thiol-ene networks are readily prepared by the photopolymerisation of multifunctional thiols and alkenes (practically any alkene will participate in the reaction). The photopolymerisation has a number of attractive features including high gel-point monomer conversions, low shrinkage, low susceptibility to oxygen inhibition and homogeneity in mechanical properties. However, the inherent flexibility of the thioether linkages means these materials have a low glass transition temperature, often at or below room temperature. Therefore applications requiring high Tg materials are inaccessible via thiol-ene polymerisations.