POLYMERISATION OF ACRYLIC MONOMERS

1. Initiation

Initiation proceeds in two stages:

a) decomposition of initiator into free radicals

I kd 2R’

b) attack by the free radical on the monomer molecule forming a monomer radical

R ‘ + M * RM ‘

If every radical from each initiator molecule reacts with a monomer molecule the rate of reaction will be given by:

Ri = 2kd[l]

where: kd is the rate dissociation constant

[I] is the initiator concentration

Usually it is not every free radical, produced by initiator decomposition, which reacts with a monomer molecule and the equation is modified to become

Ri = f2kd[l]

where: f is the initiator frequency

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