Mechanism of Controlling Cross-linking Polymerization Progress

A mechanism of controlling cross-linking polymerization process is reported in this paper. Chain propagation of cross-linking polymerization system designed in term of the mechanism is controlled, and soluble cross-linked macromolecules are successfully synthesized. The main content of the mechanism is that if there is a reaction that can compete with chain propagation of cross-linking process in a cross-linking polymerization and the reaction extent is enough high, the cross-linking polymerization is controllable. The meaning of controlled cross-linking process is that molecular chain grows limitably rather than illimitably. The characteristic random coil morphology of macromolecules in solution is the basis designing the controlled cross-linking polymerization, according to the morphology, a prepolymer containing two kinds of groups on its chain that can react with each other is synthesized firstly. In the polymerization, there are a pair of competitive reactions of intra- and intermolecular reactions that is a important factor controlling cross-linking process.