A. Morikawa
Aug 15, 1998
Citations
0
Influential Citations
43
Citations
Journal
Macromolecules
Abstract
New AB2 type monomers, with a various number of phenylene units, were prepared and converted to hyperbranched poly(ether ketones) by polymerization. Four kinds of AB2 type monomers, 4-hydroxy-3‘,5‘-bis(4-fluorobenzoyl)-biphenyl, 1, 4-hydroxy-3‘‘,5‘‘-bis(4-fluorobenzoyl)-p-terphenyl, 2, 4-hydroxy-3‘‘‘,5‘‘‘-bis(4-fluorobenzoyl)-p-quarterphenyl, 3, and 4-hydroxy-3‘‘‘‘,5‘‘‘‘-bis(4-fluorobenzoyl)-p-quinquephenyl, 4, were synthesized in a stepwise manner starting from 3,5-bis(4-fluorobenzoyl)phenol, 5, repeating a series of conversions of the hydroxy group to the triflate, cross-coupling reaction of the triflate with (p-methoxyphenyl)boronic acid, and cleavage of the methyl ether. Four kinds of hyperbranched poly(ether ketones) were prepared by the polymerization of the four AB2 type monomers. Obtained hyperbranched poly(ether ketones) from 1 and 2 were soluble in various organic solvents including N-methyl-2-pyrrolidone, m-cresol, chloroform, and tetrahydrofuran, but those from 3 and 4 were insoluble in organi...