Question

4 a)draw the structure of any trithiocarbonate chain transfer agent employed in the reversible addition -fragmentation chain transfer (RAFT ) polymerisation process

b)outline a reaction pathway for the preparation a- carboxyl functionalised polystyrene by (RAFT) methods

Answer 1

Ans. 4

RAFT polymerisation refers to the Reversible Addition Fragmentation chain Transfer polymerization. It is a form of living radical polymerisation. This process involves conventional free radical polymerization of a substituted monomer in the presence of a suitable chain transfer agent (RAFT agent). Commonly used RAFT agents include compounds like trithiocarbonates. (a)​ Trithiocarbonates

​​Characteristics :

1. High transfer constants

2. More hydrolytically stable .

3. Cause less retardation .

  

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