Chain growth or addition polymerisation : It involve a series of reaction each of which consumes a reactive particle and produces another same one. The reactive molecule can be free radicals or ion (cation or anion) to which monomers get added by a chain reaction. The polymers thus created are called as chain growth polymers. Chain growth polymerisation is a very important reaction of alkenes and conjugated dienes or indeed of all kinds of compounds that contain carbon-carbon double bond polypropylene, polybutadiene, teflon PVC, polythene, polystyrene are some of chain polymers. It is dependent on three mechanisms
(i) Free radical mechanism (ii) Cation mechanism (iii) Anion mechanism
Each mechanism of polymerisation reaction involves an initiator of their related nature. The addition polymerisation process is very rapid and is also characterized by three basic types i.e. chain initiation, chain propogation and chain termination step.
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