In situ xanthate deprotection to generate thiol chain transfer agents for conventional free radical linear and branched vinyl polymerization

2017 ◽  
Vol 55 (24) ◽  
pp. 3963-3967 ◽  
Author(s):  
Sean Flynn ◽  
Simon D. Dale ◽  
Andrew B. Dwyer ◽  
Pierre Chambon ◽  
Steve P. Rannard
Keyword(s):  
Free Radical ◽  
Chain Transfer ◽  
Vinyl Polymerization ◽  
Transfer Agents

Facile and cost-effective branched acrylic copolymers from multifunctional comonomers and multifunctional chain transfer agents

2015 ◽  
Vol 6 (41) ◽  
pp. 7333-7341 ◽  
Author(s):  
M. S. Chisholm ◽  
I. K. Martin ◽  
A. T. Slark
Keyword(s):  
Free Radical ◽  
Functional Groups ◽  
Chain Transfer ◽  
Cost Effective ◽  
High Conversion ◽  
Acrylic Copolymers ◽  
Transfer Agents

Branched acrylic copolymers were synthesised via facile conventional free-radical polymerisations taken to high conversion using comonomers containing 2-6 acrylate functional groups and chain transfer agents containing 1-8 thiol functional groups.

scholarly journals Methylenelactide: vinyl polymerization and spatial reactivity effects

2016 ◽  
Vol 12 ◽  
pp. 2378-2389 ◽  
Author(s):  
Judita Britner ◽  
Helmut Ritter
Keyword(s):  
Free Radical ◽  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Chain Transfer ◽  
Free Radical Polymerization ◽  
Controlled Radical Polymerization ◽  
Experimental Results ◽  
Cyclic Monomer ◽  
Vinyl Polymerization ◽  
Reversible Addition

The first detailed study on free-radical polymerization, copolymerization and controlled radical polymerization of the cyclic push–pull-type monomer methylenelactide in comparison to the non-cyclic monomer α-acetoxyacrylate is described. The experimental results revealed that methylenelactide undergoes a self-initiated polymerization. The copolymerization parameters of methylenelactide and styrene as well as methyl methacrylate were determined. To predict the copolymerization behavior with other classes of monomers, Q and e values were calculated. Further, reversible addition fragmentation chain transfer (RAFT)-controlled homopolymerization of methylenelactide and copolymerization with N,N-dimethylacrylamide was performed at 70 °C in 1,4-dioxane using AIBN as initiator and 2-(((ethylthio)carbonothioyl)thio)-2-methylpropanoic acid as a transfer agent.

New chain transfer agents for free radical polymerizations

1991 ◽  
Vol 26 (4) ◽  
pp. 239-244 ◽  
Author(s):  
Gordon F. Meijs ◽  
Ezio Rizzardo ◽  
Tam P. T. Le
Keyword(s):  
Free Radical ◽  
Chain Transfer ◽  
Radical Polymerizations ◽  
Transfer Agents

Plasticization by in Situ Grafted Acrylates II—Effect of Graft Structure

1985 ◽  
Vol 58 (1) ◽  
pp. 146-153
Author(s):  
Roger J. Eldred
Keyword(s):  
Low Temperature ◽  
Chain Transfer ◽  
Direct Result ◽  
Acrylate Monomer ◽  
A Chain ◽  
Low Temperature Flexibility ◽  
Acrylate Monomers ◽  
Better Than ◽  
Transfer Agents

Abstract Grafting of acrylate monomers, such as 2-ethylhexyl acrylate, onto nitrile rubber during the cure cycle leads to improved low temperature flexibility. The effect of graft structure on the improvement was determined by utilizing chain transfer agents to reduce the molecular weight and increase the number of grafts. In every instance, incorporation of a chain transfer agent led to a compound with greater low-temperature flexibility than a control. The amount of improvement was correlated with the effectiveness of each additive in chain transfer reactions. Since there was no evidence of either degradative chain transfer or changes in cure state, it was concluded that the increased low-temperature flexibility was a direct result of alterations in the graft structure. The plasticization achieved with chain transfer agents and 2-ethylhexyl acrylate monomer was better than previously obtained using more effective acrylic monomers without the additives. This means that the structure of the graft is the major factor in determining the effectiveness of in situ grafted acrylate monomers as plasticizers.

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