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Ch 14 pt 3 - Polymerization Free radical(addition...

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Chapter 14 - 20 Polymerization Free radical ( addition ) polymerization: Monomer units daisy-chained 1 at a time to form linear macromolecule 3 stages: initiation, propagation & termination… C C H H H H monomer (ethylene) R + free radical Initiator or catalyst R C C H H H H Initiation Propagation R C C H H H H C C H H H H + R C C H H H H C C H H H H dimer ± = unpaired e - Termination: ² Active ends of 2 propagating chains may link - combination ² Dead chains also possible, e.g. via H atom - disproportionation Chain forms via sequential addition of monomer units Active site (unpaired e - ) transfers to each successive end monomer
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