Question:

Chain transfer reagent is

Updated On: Aug 1, 2023
  • $CCI_4$
  • $CH_4$
  • $O_2$
  • $H_2$
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A substance that is able to cause a chain transfer in a chain polymerisation is called a chain transfer agent. It gives an atom to the radical at the growing end of a polymer chain and in doing so it results into a radical which can start the growth of a new chain. $CCl_4$ is a chain transfer reagent.
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Ans: It is a chemical compound that can be used in the process of polymerization. This helps to control the length and the molecular weight of the polymer that is to be formed. The reagent will be used as both regulator and the terminator of this process. 

The process involves the usage of monomers to form polymers. In this the monomers link together to form a polymer of long chains. If this is uncontrolled it can form long polymers chains that have a higher molecular weight. This will further have highly reduced processability and also higher viscosity. A chain transfer reagent such as CCl4 is used so that this process can be controlled and an accurate polymer is formed. The reagent will compete with the active species that are responsible for chain propagation reaction. The chain gets terminated so that a chain of lower molecular weight can be obtained. Some of the effects of chain transfer reagents are as follows:

  • Shorter polymer chains 
  • Controlling the properties of polymers 
  • Narrowing the molecular weight of the polymer 
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