Initiation of 1,6-hexanedioldiacrylate polymerization by three component photoinitiators incorporating 2,3-dimethylmaleic anhydride

摘要

three component photoinitiators mixtures comprised of benzophenone (BP),4-benzoylbiphenyl(BBP),or isopropylthioxanthone (ITX)with a tertiary amine and an electron deficient anhydride ene result in rapid photoinitiation rates of acrylate polymerization.Concentrations of less whan 0.1 weight percent 2,3-dimethylmaleic anhydride (DMMA0added to 1,6-hexanedioldiacylate (HDDA)containing any of the aforementined diarylketones and N-methyl-N,N-diethanolamine (MDEA)results in an increase in the polymerization rate maximum by a factor of as much as three times that attained for samples with only MDEA and BP,BBP,or ITX.Laser flash photolysis results confirm that BP,BBP,and ITX are readily quenched by MEDA and DMMA.An initiatin mechanism is proposed.