From Fig. 5, it is observed that the conversion of
styrene monomer promptly increased in the initial period
of polymerisation and then approached about 100%.
With the increase in the amount of BPO, the rate of
polymerisation increased and the time required for
complete conversion was reduced, i.e., within about 20
and 16 h from 0.4 to 1.0% of BPO.