✍ Scribed by P.K. Sengupta; M. Modak
No coin nor oath required. For personal study only.
Photopolymerization of methyl methacrylate in the presence of mercaptobenzthiazole shows some deviation from the simple reaction scheme, particularly at higher initiator concentrations and with solvents like benzene. The deviation has been explained by the participation of mercaptobenzthiazole in the thiol-thione tautomeric form. Kinetic observations are consistent with a mechanism involving an equilibrium complex between thiol and thione structures. Spectrophotometric studies on initiator decomposition and direct measurement of rates of initiation show relatively high initiator efficiency.
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Photopolymerization of MMA at 35 was studied using benzophenone (BP)-dimethylaniline (DMA) combination as photo-redox initiator. Initiator exponent was 0.13: monomer exponent was < 1.0 in chlorinated solvents and > 1.0 in other solvents. Photoreduction of BP by DMA is considered to produce chain-ini
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 de