Synthesis of Macrocyclic Polymers Formed via Intramolecular Radical Trap-Assisted Atom Transfer Radical Coupling

2012 ◽  
Vol 1 (8) ◽  
pp. 1066-1070 ◽  
Author(s):  
Andrew F. Voter ◽  
Eric S. Tillman ◽  
Peter M. Findeis ◽  
Scott C. Radzinski
Keyword(s):  
Atom Transfer ◽  
Radical Trap ◽  
Radical Coupling ◽  
Macrocyclic Polymers

Dimerization of Poly(methyl methacrylate) Chains Using Radical Trap-Assisted Atom Transfer Radical Coupling

2014 ◽  
Vol 47 (7) ◽  
pp. 2226-2232 ◽  
Author(s):  
Christopher J. Valente ◽  
Autumn M. Schellenberger ◽  
Eric S. Tillman
Keyword(s):  
Methyl Methacrylate ◽  
Atom Transfer ◽  
Poly Methyl Methacrylate ◽  
Radical Trap ◽  
Radical Coupling

scholarly journals Effect of Trapping Agent and Polystyrene Chain End Functionality on Radical Trap-Assisted Atom Transfer Radical Coupling

Polymers ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 2737-2751 ◽  
Author(s):  
Elizabeth Carnicom ◽  
Jessica Abruzzese ◽  
Yacouba Sidibe ◽  
Kenneth Myers ◽  
Eric Tillman
Keyword(s):  
Atom Transfer ◽  
Radical Trap ◽  
Radical Coupling ◽  
Trapping Agent

Radical Trap-Assisted Atom Transfer Radical Coupling of Diblock Copolymers as a Method of Forming Triblock Copolymers

2016 ◽  
Vol 217 (22) ◽  
pp. 2473-2482 ◽  
Author(s):  
Benjamin D. McFadden ◽  
Maya M. Arce ◽  
Elizabeth M. Carnicom ◽  
Julie Herman ◽  
Jessica Abrusezze ◽  
...  
Keyword(s):  
Diblock Copolymers ◽  
Triblock Copolymers ◽  
Atom Transfer ◽  
Radical Trap ◽  
Radical Coupling

scholarly journals Universal Chain-End Coupling Conditions for Brominated Polystyrenes, Polyacrylates, and Polymethacrylates

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1001
Author(s):  
Joseph J. Andry ◽  
Jaenic J. Lee ◽  
Jessica Wu ◽  
Katherine Xia ◽  
Eric S. Tillman
Keyword(s):  
Copper Catalysts ◽  
Polymeric Chain ◽  
Atom Transfer ◽  
Controlled Polymerization ◽  
Reaction Conditions ◽  
Radical Trap ◽  
Radical Coupling ◽  
Radical Traps ◽  
Effective Reaction ◽  
Single Set

Atom transfer radical coupling (ATRC), performed with or without radical traps, has allowed for high extents of coupling (Xc) for a variety of brominated polymers, yet structurally different polymeric chain ends require unique reagents and reaction conditions. Inspired by a similar study that focused on universal conditions for the controlled polymerization of different monomers using atom transfer radical polymerization (ATRP), this work focuses on developing a single set of conditions (or conditions with as little variation as possible) that will achieve extents of coupling greater than 80% or end-brominated chains of polystyrene (PSBr), poly(methyl methacrylate) (PMMABr), and poly(methyl acrylate) (PMABr). The radical traps α-phenyl-tert-butylnitrone (PBN), 2-methyl-2-nitrosopropane (MNP), and nitrosobenzene (NBz) were chosen in this study, along with copper catalysts, reducing agents, and nitrogen-based ligands. Ultimately, a single set of effective reaction conditions was identified with the only difference being the radical trap used: MNP was effective for coupling PSBr and PMABr while NBz was necessary to achieve similarly high extents of coupling for PMMABr.

scholarly journals A new approach to multiblock copolymers using atom transfer radical coupling

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
René Nagelsdiek ◽  
Helmut Keul ◽  
Hartwig Höcker
Keyword(s):  
Block Copolymers ◽  
Bisphenol A ◽  
Coupling Efficiency ◽  
Chain Extension ◽  
Multiblock Copolymers ◽  
Atom Transfer ◽  
Radical Species ◽  
New Approach ◽  
Radical Coupling ◽  
Phenylene Oxide

AbstractAtom transfer radical coupling (ATRC) is a method for chain extension of styrene homopolymers prepared by atom transfer radical polymerization (ATRP). This concept is used to produce multiblock copolymers from block copolymers prepared via ATRP of styrene using various macroinitiators. ATRC comprises the reactivation of the dormant species at the chain ends. In the absence of monomer, the active radical species recombine to give chain extension (from polystyrene, PS) or multiblock copolymers (from block copolymers). The application of ATRC to PSblock- poly(bisphenol A carbonate)-block-PS (PS-b-PC-b-PS) was not successful because chain degradation of the PC block occurs. However, poly(phenylene oxide)-block-PS (PPO-b-PS) and PS-b-PPO-b-PS were successfully transformed into tri- and multiblock copolymers by ATRC, although the coupling efficiency is not as high as observed for PS oligomers under similar conditions.

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