The photopolymerization of acrylonitrile (AN) was studied by using 8-acryloyloxyquino-line (AQ) and its polymer (PAQ) as sensitizers under UV irradiation. The photopolymerization rate of AN in DMF by using AQ as sensitizer is proportional to 0.36th power of AQ concentration and 1.10th power of AN concentration. In the case of PAQ as sensitizer for the photopolymerization of AN

the rate is proportional to 0.31th power of PAQ concentration and 0.73 th power of AN concentration. From the recording of fluorescence intensity of PAN sensitized by AQ and PAQ

it is confirmed that AQ and PAQ not only sensitized the photopolymerization of AN but also entered into the PAN chains. The initiation mechanism was tantatively deduced.