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

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

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.

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

scholarly journals Dissipative Particle Dynamics Study on Interfacial Properties of Symmetric Ternary Polymeric Blends

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1516
Author(s):  
Dongmei Liu ◽  
Kai Gong ◽  
Ye Lin ◽  
Tao Liu ◽  
Yu Liu ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Chain Length ◽  
Triblock Copolymer ◽  
Diblock Copolymers ◽  
Triblock Copolymers ◽  
Dissipative Particle Dynamics ◽  
Interfacial Properties ◽  
Particle Dynamics ◽  
Polymeric Blends ◽  
Polymer Component

We investigated the interfacial properties of symmetric ternary An/AmBm/Bn and An/Am/2BmAm/2/Bn polymeric blends by means of dissipative particle dynamics (DPD) simulations. We systematically analyzed the effects of composition, chain length, and concentration of the copolymers on the interfacial tensions, interfacial widths, and the structures of each polymer component in the blends. Our simulations show that: (i) the efficiency of the copolymers in reducing the interfacial tension is highly dependent on their compositions. The triblock copolymers are more effective in reducing the interfacial tension compared to that of the diblock copolymers at the same chain length and concentration; (ii) the interfacial tension of the blends increases with increases in the triblock copolymer chain length, which indicates that the triblock copolymers with a shorter chain length exhibit a better performance as the compatibilizers compared to that of their counterparts with longer chain lengths; and (iii) elevating the triblock copolymer concentration can promote copolymer enrichment at the center of the interface, which enlarges the width of the phase interfaces and reduces the interfacial tension. These findings illustrate the correlations between the efficiency of copolymer compatibilizers and their detailed molecular parameters.

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