he absorption spectra and the stability of CTC of Fc/BPO in acetonitrile were investigated . The association constant

(K=4lmol-1)

and the extinction coefficient

(ε= 240M-1 cm-1 ) of CTC were measured. It was found that the CTC is quite stable under - 20 ℃. But

it can be decomposed rapidly then to initiate polymerization of MMA efficiently by producing radical under room temperature.