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PHOTOPOLYMERIZATION OF METHYL METHACRYLATE USING PIPERAZINE-SULFUR DIOXIDE CHARGE-TRANSFER COMPLEX AS A PHOTOINITIATOR

Photopolymerization of methyl methacrylate (MMA) was kinetically studied by using piperazine (PPZ) sulfur dioxide (SO 2) charge transfer complex as a photoinitiator. It was found that the polymerization rate ( R p) was dependent on the molar ratio of piperazine to sulfur dioxide, and the complex(Ⅰ) with a composition of PPZ/SO 2=1/2 in molar ratio was the most effective. By using Ⅰ as the photoinitiator, the polymerization kinetics can be expressed as R p= K p [Ⅰ] 0.34 [MMA] 1.06 , and the apparent activation energy ( E a) value was obtained to be 23.7 kJ/mol. A possible polymerization mechanism was also proposed.