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Unformatted text preview: ± Radical from intiation adds to alkene to generate alkene derived radical ± This radical adds to another alkene, and so on many times 7 Polymerization: Termination ± Chain propagation ends when two radical chains combine ± Not controlled specifically but affected by reactivity and concentration 8 Other Polymers ± Other alkenes give other common polymers 3 9 Unsymmetrical Monomers ± If alkene is unsymmetrical, reaction is via more highly substituted radical 10 Chain Branching During Polymerization ± During radical propagation chain can develop forks leading to branching ± One mechanism of branching is short chain branching in which an internal hydrogen is abstracted 11 Long Chain Branching ± In long chains, a hydrogen from another chain is abstracted 12 Cationic Polymerization ± Vinyl monomers react with Brønsted or Lewis acid to produce a reactive carbocation that adds to alkenes and propagates via lengthening carbocations...
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