Journal ArticleDOI
The thiol/dimethyl sulfoxide system as initiator of polymerization in benzene medium, 1. General features
TLDR
In this paper, the effect of butanethiol as well as that of dimethyl sulfoxide individually on the AIBN-catalysed polymerization of methyl methacrylate (MMA) in benzene medium was examined.Abstract:
Thiol/dimethyl sulfoxide systems are good initiators for the polymerization of methyl methacrylate (MMA) and some other acrylate monomers in benzene medium, but they fail to initiate the polymerization of styrene, vinyl acetate and acrylonitrile. The rate of polymerization of MMA is dependent on the chain length of the thiol used and dodecanethiol is found to be the most reactive one. The presence of traces of oxygen increases the rate of polymerization probably by forming a co-redox system with the thiol. The polymerization is completely inhibited by 2,2-diphenyl-1-picrylhydrazyl and benzoquinone indicating the free radical nature of the reaction.
The effect of butanethiol as well as that of dimethyl sulfoxide (DMSO) individually on the AIBN-catalysed polymerization of MMA in benzene medium was examined. Butanethiol does not affect the rate of the radical polymerization, but reduces the molecular weight of the polymers formed due to a chain transfer. DMSO has no effect on the radical polymerization up to a concentration of 6,42.10−2 mol 1−1, above which it reduces the rate and also the molecular weight probably by forming a growing radical-DMSO adduct of a reactivity lower than that of the original growing radicals.read more
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Journal ArticleDOI
Revisiting aromatic thiols effects on radical photopolymerization
TL;DR: In this article, the influence of thiols on the kinetics of acrylate radical photopolymerization in the presence and absence of photoinitiators was studied.
Journal ArticleDOI
Polymerization of Acrylonitrile with Ceric lon-2-Propanethiol as Initiator System
TL;DR: In this paper, the rate of polymerization was found to be proportional to the square root of both ceric ion and thiol concentrations, and the monomer exponent was close to 1.5.
Journal ArticleDOI
Aqueous polymerization of methacrylamide with potassium persulphate/thiomalic acid redox pair
G. S. Misra,S. L. Dubey +1 more
TL;DR: In this paper, the effect of monomer, K2S2O8 and thiomalic acid concentrations and temperature on the rate of polymerization was studied and the role of complexing metal ions and a series of aliphatic alcohols was also investigated.