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Why should we always use purest monomer...

Why should we always use purest monomer in free radical polymerisation?

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Because evien traces of impurities, :which can act as chain transfer agent (inhibitor), can interfere with the original polymerisation chain reaction. Hence mogomers should be free from all impurities, examples of inhibitors (or chain transfer agents) are 'CCl_J, CBr_e' amines, phenols, quinones etc.
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