.3 Write down a reaction scheme for polymerization of styrene initiated by thermolysis of azobisisobutyronitrile, including both combination and disproportionation as possible modes of termination. A sample of polystyrene, prepared by bulk polymerization at 60C using radioactive (14C) azobisisobutyronitrile (14CAIBN) as initiator, was found to have a number-average molar mass Mn of 1000kgmol1 and a radioactivity of 6103 counts s s1g1 (measured using a liquid-scintillation counter). Given that the 14CAIBN has a radioactivity of 6109 counts s1mol1, determine the mode of termination that operated during preparation of the polystyrene sample