1. Chain and Step Growth Polymerization Brazel & Rosen 8.1

2. 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

3. Stages of Chain Growth
Initiation
Propagation
Termination

4. Mechanisms of Termination
Combination
Disproportionation
H abstraction
Chain Transfer
Abstraction
backbiting

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

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

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