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Polymerization Reactions

Polymerization Reactions. Chemistry II. Types of Polymerization Reactions. Addition polymerization – monomers are added together, with no other products formed Condensation polymerization – small molecule, like water, is formed in the polymerization. Types of Polymers.

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Polymerization Reactions

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  1. Polymerization Reactions Chemistry II

  2. Types of Polymerization Reactions • Addition polymerization – monomers are added together, with no other products formed • Condensation polymerization – small molecule, like water, is formed in the polymerization

  3. Types of Polymers • Copolymer – Two different monomers form the chain • Homopolymer – All of the monomers are the same • Thermoset– when molded to a certain shape it cannot be softened again or dissolved, like Bakelite • Thermoplastic – can be remelted after molded

  4. Addition Polymerization • Process initiated by free radical (has unpaired electron) • Free radical attacks double bond to form a new free radical • Termination of the reaction occurs when 2 radicals react to form a bond

  5. Condensation Polymerization • Formation of Nylon dimer • Dimer – two monomers joined • Amino group on left or Acid group on right can continue to react, extending the polymer

  6. Polymers based on Ethylene • LDPE – Low Density Polyethylene • Highly branched • Not tightly packed • HDPE – High Density Polyethylene • Mostly straight-chain molecules • Tightly packed

  7. Examples • Polypropylene – monomer is propylene, so X is CH3 • Isotactic chain vs. Syndiotactic vs. Atactic

  8. Polystyrene • Polyvinyl chloride (PVC)

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