Synthesis and Characteristic of Polysiloxane with the Side Chain of Benzophenone Groups

In the presence of alkalinity and tetraethyl ammonium bromide, 2,4-dihydroxy benzophenone reacts with allyl glycidyl ether to form an ethylenic derivative of benzophenone, 2- hydroxy-4-(β-hydroxy-γ-allyloxy) propyloxy benzophenone, which can further undergo hydrosilylation with polyhydromethylsiloxane. A new polysiloxane with the side chain of benzophenone groups is synthesized. Chemical structures of 2-hydroxy- 4-(β-hydroxy-γ-allyloxy) propyloxy benzophenone and the polysiloxane bearing side chain of benzophenone were determined by elementary analysis, IR, NMR and ultraviolet spectrum. Experiment results indicate that both the ethylenic derivative of benzophenone and the new synthesized polysiloxane are characteristic of three typical intensive and broad absorption bands in ultraviolet region at about 240nm, 288nm and 326nm, and show effective ultraviolet absorptive ability in wavelengths between 240nm and 400nm.