Prediction of the directional effect of pressure on the reactivity ratios in free‐radical copolymerizations

The Q–e concept of the Alfrey and Price1 has been applied successfully to the prediction of the pressure effect on the individual reactivity ratios in free‐radical copolymerizations. Although the Q value of a given monomer is generally little affected by an increase in pressure, the e value is pressure dependent. The knowledge of the Q and e values at high pressures permits the prediction of variations in reactivity ratios with pressure. Some important consequences have been drawn from this concept.