Synthesis and Property of Amphiphilic Photoinitiator 4-Methoxyphenyl Thiomonoester Oxalate
An amphiphilic photoinitiator,4-methoxyphenyl thiomonoester oxalate(MO-TEA),was synthesized from 4-methoxyphenthiophenol and oxaloyl chloride,and the light absorption properties,photodegradation mechanism,solubility in water,thermostability and ability to initiate photopolymerization of MO-TEA were investigated by UV-Vis,ESR,TGA and RT-IR.The results showed that MO-TEA has low molar extinction coefficients at above 300 nm,but it is able to initiate polymerization of acrylate monomers under the irradiation of 405 nm LED through breaking of thioester bond to produce sulfur free radical and acyl free radical.Besides,MO-TEA has good water solubility,and can effectively initiate polymerization of oil-based tripropylene glycol diacrylate(TPGDA)and water-based polyethylene glycol 400 diacrylate(PEG(400)DA).The final double bond conversions reach higher than 80％.It has a great potential in the field of LED photopolymerization.
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