Abstract
AbstractRadical polymerization of acrylonitrile in liquid sulfur dioxide was carried out at 50°C. with α,α‐azobisisobutylonitrile as an initiator. When aniline (An), dimethylaniline (DMA), dimethyl‐o‐toluidine (DMoT), and diethylaniline (DEA) were added to this system, it was found that each base acted as a retarder for the polymerization. When the chain transfer constant was calculated for each base, the values were 1.0 (An), 1.5 (DMA), 3.0 (DMoT), and 9.3 (DEA). The Alfrey‐Price etr values calculated from these values were −2.79 (An), −3.14 (DMA), −3.72 (DMoT), and −4.66 (DEA). On plotting these values against pKa of each base, a linear relationship was found.
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