Study of Photoinitiation Properties of Thioxanthone Compounds by Laser-Nephelometry

The photoinitiation properties of thioxanthone compounds in pentaervthritol triacrylate system were investigated by Laser-Nephelometry,Experimental results showed that theinitiation efficiency of thioxanthone compound is better than that of benzophenone and benzoinether.The initiation efficiency of thioxanthone compound is markedly influenced by the kindsand positions of the substituents in it and the properties of photoactivatos. The oxygen inhibitionof photopolymerization in this system can be neglected. The best initiation concentration of thiox-anthone compounds is about 1.5%～2.5%(ω_B).