Explanation

The reaction process in which the active chain of chain polymerization reacts with other substances to terminate the original active center and generate a new active center at the same time. The active chain can chain transfer to monomer, solvent, initiator, macromolecule chain and chain transfer agent. The ability to transfer to monomer is related to monomer structure, temperature and other factors. The transfer of free radicals to initiator leads to induced decomposition, which reduces initiator efficiency and degree of polymerization. In solution polymerization, chain transfer reaction to solvent should be considered. chain transfer reaction has a great influence on the molecular weight of polymer. In practical production, chain transfer reaction is often used to control the molecular weight of polymer and synthesize graft copolymer. For example, the molecular weight of polyvinyl chloride is adjusted by temperature, and the molecular weight of polypropylene eye is adjusted by isopropanol.

Classification