Chain and Step Growth Polymerization Brazel & Rosen 8.1

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Presentation transcript:

Chain and Step Growth Polymerization Brazel & Rosen 8.1

Chain Growth (Addition) Polymerization Four chain growth mechanisms Free radical Cationic Anionic Coordination I . + M M. H + Dissolve in THF, acetone, DMF, DCM, DMSO C=C H H carbocation ¨ C Dissolve in formic acid, IPA, EtOH, MeOH R1 R3 R2 carbanion M-C

Stages of Chain Growth Initiation Propagation Termination

Mechanisms of Termination Combination Disproportionation H abstraction Chain Transfer Abstraction backbiting

Step Growth (Condensation) Polymerization Polycondensation Bifunctional monomers of different species react to form new molecule plus some byproduct Polyester Nylon 6,6

Step Growth (Condensation) Polymerization Self-condensation Polycaprolactone Exceptions to condensation rule Polyurethane

Polymers formed by step growth polymerization Aliphatic polyimides Polyaramids Polyesters Polyethylene terephthalate Polyurethanes Polycarbonates polyimides

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