The role of mid-chain radicals in acrylate free radical polymerization: Branching and scission

2008 ◽  
Vol 46 (23) ◽  
pp. 7585-7605 ◽  
Author(s):  
Thomas Junkers ◽  
Christopher Barner-Kowollik
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Free Radical Polymerization

Role of Chain Transfer Agents in Free Radical Polymerization Kinetics

2010 ◽  
Vol 43 (4) ◽  
pp. 1823-1835 ◽  
Author(s):  
T. Furuncuoğlu ◽  
İ. Uğur ◽  
İ. Değirmenci ◽  
V. Aviyente
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Chain Transfer ◽  
Free Radical Polymerization ◽  
Polymerization Kinetics ◽  
Transfer Agents

scholarly journals On the mechanism of acrylamide emulsion polymerization with the participation of its dimers

2021 ◽  
pp. 50-56
Author(s):  
L.R. Harutyunyan ◽  
◽  
R.S. Harutyunyan ◽  
Keyword(s):  
Free Radical ◽  
Emulsion Polymerization ◽  
Radical Polymerization ◽  
Reaction Order ◽  
Free Radical Polymerization ◽  
Water Soluble ◽  
Polymerization Mechanism ◽  
Low Concentrations ◽  
Acrylamide Monomer

The role of both dimeric and monomeric forms of acrylamide monomer in the process of polymerization in emulsions initiated by different type of initiators was discussed and the reasons for the reaction order with respect to monomer greater than unity were elucidated for acrylamide free radical polymerization in emulsions. The emulsion polymerization mechanism of acrylamide is discussed separately for the processes initiated by water-soluble initiator and oil-soluble initiator. The main difference in two cases is the distribution of acrylamide and initiator in aqueous and toluene phases. In the case of using water-soluble initiator, the initiator and acrylamide are in the same phase, whereas the molecules of the initiator and acrylamide are distributed between different phases in the case of using oil-soluble initiator. As a result, the participation of the dimers in the process of acrylamide emulsion polymerization is more efficient for the system where water-soluble initiator is used. For that system, it is suggested that both dimers and monomers of acrylamide participate in the propagation reaction at relatively low concentrations of acrylamide, which explains the value of the reaction order with respect to monomer greater than unity.

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