Termination

This proceeds in accordance with the equation

Mx + My^MxMy (combination)

or

M x + M у Mx + My (disproportionation)

Rate of termination Rt = 2k, [M ]2 which apphes to termination by combination or disproportionation.

Thus an overall equation for acrylic polymerisation can be written as

Rp = kp[M]( ^ )1/2 = кр[М]ф-

Подпись: where: [I] [M] fkd kt concentration of initiator concentration of monomer

frequency and decomposition constants for the initiator rate coefficient of chain termination

that is: Rp a [M] and Rp a [l]1/2

image25

Plots of Rp against [M] for various monomers produce a straight line graph of the type illustrated below

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