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Photopolymerization of methyl methacrylate using a morpholine–sulfur dioxide charge-transfer complex as the photoinitiator

✍ Scribed by Premamoy Ghosh; Ganeschandra Pal

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
191 KB
Volume
36
Category
Article
ISSN
0887-624X

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✦ Synopsis

Photopolymerization of the vinyl monomer (M) of methyl methacrylate (MMA) was kinetically studied by using near-UV/visible light at 40ЊC and employing a morpholine (MOR) -sulfur dioxide (SO 2 ) charge-transfer (C-T) complex as the photoinitiator. The rate of polymerization ( R P ) was found to be dependent on the morpholine: sulfur dioxide mole ratio; the 1 : 2 (MOR-SO 2 ) complex acted as the latent initiator complex C which underwent further complexation with the monomer molecules to give the actual initiating complex I. Using the 1 : 2 (MOR-SO 2 ) C-T complex as the latent initiator, the observed kinetics may be expressed as R P ϰ [MOR-SO 2 ] 0.27 [M] 1.10 . Benzoquinone behaved as a strong inhibitor. Polymers obtained tested positive for the incorporation of a sulphonate-type end group. Polymerization followed a radical mechanism. Kinetic nonideality as revealed by a low initiator exponent and monomer exponent of greater than unity was explained on the basis of a prominent primary radical termination effect.

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