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Polymerization

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Step polymerizations involve succesive reactions between pairs of mutually-reactive functional groups which initially are provided bu the monomers.

-polyethers

-polysulphide

-polycarbonate

-polyamide

-polyurethane

-polyurea

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Polycondensation

-step polymerizations that involve reactions in which small moledules are eliminated

–polyesters, polyamides, polyethers

RA2+RB2 type raction

RAB type reaction

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Polyaddition

-step polymerizations in which the monomers react together without the elimination of other molecules

–polyurethanes and polyureas

RA2+RB2 type raction

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Chain polymerization

-Unsaturated monomer molecules add onto the active site on a growing polymer chain one at a time

-polyethylene, polypropylene

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Carothers theory

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Kinetics of step polymerization

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Statistical distribution

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Free radical reaction

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Initiator

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Kinetics of chain growth