Y. Miura, Y. Yoshida
Apr 1, 2002
Citations
0
Influential Citations
20
Citations
Journal
Macromolecular Chemistry and Physics
Abstract
Three kinds of 2,2,6,6-tetramethylpiperidine-N-oxyl (EMPO)-based alkoxyamines, 1-(4-iodophenyl)- (3), 1-(4-ethynylphenyl)- (4), and 1-[4-(1, 3, 2-dioxaborinan-2-yl)phenyl]-(2,2,6,6-tetramethyl-1-piperidinyloxyl)ethanes (5) were prepared. The Pd-catalyzed cross-coupling reaction of 3 with 1,3,5-triethynylbenzene or 1,3,5-tribromobenzene with 4 gave the corresponding 1,3,5-tris(alkoxyaminophyenylethynyl)benzene 11, and the Pd-catalyzed cross-coupling reaction of 5 with 1,3,5-tribromobenzenegave the corresponding 1,3,5-tris(alkoxyaminophenyl)benzene 12. Bulk polymerization of styrene (St) at 120°C initiated with 11 and 12 were investigated. The first-order plots, linear relationships between and conversion, and low M w /M n s of the formed poly(St) showed that the polymerization proceeded in the living fashion, leading to formation of well-defined three-arm star polymers with M w /M n of 1.20-1.40.