ma9b01797_si_001.pdf (706.98 kB)
Highly Efficient Atom Transfer Radical Polymerization System Based on the SaBOX/Copper Catalyst
journal contribution
posted on 2019-12-12, 19:38 authored by Zhi-Hao Chen, Xiao-Yan Wang, Xiu-Li Sun, Jun-Fang Li, Ben-Hu Zhu, Yong TangA side-armed bis(oxazoline)
(SaBOX)/copper catalyst, possessing a low equilibrium constant (KATRP = kact/kdeact) and bearing large side-arm groups, was
employed for supplemental activation and reducing agent atom transfer
radical polymerization (SARA ATRP) of methyl methacrylate (MMA), which
suppressed radical–radical termination events and successfully
achieved very fast and controlled polymerizations, high end group
fidelity, and ultrahigh molecular weight (up to 741 kg/mol) under
common conditions. Compared with the copper complex bearing pentamethyldiethylenetriamine
or tris[2-(dimethylamino)ethyl]amine (Me6TREN) as the ligand,
the SaBOX/copper catalyst performed much better in terms of polymerization
rate and controllability under the same conditions via lowering the
growing radical concentration and prolonging the time scale of living
polymerization, an indicative of its unprecedentedly high efficiency
in ATRP of MMA. The versatility and robustness of the SaBOX/copper
system was further demonstrated by the controlled polymerization of
various monomers, such as methacrylates, acrylates, styrenes, acrylamide,
and even methacrylic acid. In situ chain extension experiments confirmed
the very high end group fidelity, allowing the convenient preparation
of well-defined block copolymers.