6 июля, 2015 
Malyar Commercial polymerisations usually employ between 0.2-4% of initiator. When the concentration of initiator is reduced, the molecular weight of the polymer is increased, but the conversion of monomer to polymer is reduced. Higher concentrations of initiator form a greater number of polymer chains. These chains are shorter and hence molecular weight and viscosity are lower.
(ii) Chain Transfer Agents
As discussed earlier, a chain transfer agent terminates a propagating chain, whilst making the free radical available to initiate the propagation of another chain.
The higher the concentration of the chain transfer agent, the lower the molecular weight and hence, the lower the solution viscosity for a given solvent.
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