Abstract: On the basis of former studies found in literatures,the mechanism of group transfer polymerization (GTP) activated by ionic field was proposed.In this mechanism,initiator is activated by a special ionic field produced by anionic catalyst.The intensity of the field enjoyed by each molecule of imtiator(Q_i) is directly proportional to total intensity of the field (Q) which is directly proportional to the equivalent concentration of catalyst,and is inversely proportional to the equivalent concentration of initiator (n),i.e.Q_i=Q/n.Along as Q_i reach a certain value,i.e.Q_i≥Q_mm,GTP will take place.Along with the raise of Q_i value,activation extent of initiator increases,induction period of polymerization shortens,and the speed of polymerization increases.

Key words: Group transfer polymerization, Polymerization mechanism, Ionic field activation