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What are chain transfer agents ? Giving a suitable example , explain the overall effect of these agents on the process of vinyl polymerization. |
Answer» Solution :Compounds which bring about the termination of the original polymer chain with the simultaneous initiation of another polymer chain are called chain transfer AGENTS. For example , in presence of `C CI_4`, styrene undergoes polymerization at the same rate as in its absence but the polystyreneformed has a lower AVERAGE molecular mass. Furthermore , it also contains small AMOUNTS of chloride. This may be explained as follows . The growing polystyrene radical chain (I) which would NORMALLY react with another MONOMER molecule instead reacts with chain transfer aget `(C CI_4)` to terminate the original chain and the new free radical produced initiates a new polymerization chain incorporating chloride atom. Thus : 
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