“…This might be achieved via specific interactions. 19 In our laboratory, various phosphine oxide-containing polymers, such as poly(arylene ether)s, 20 polyim-ides, 21 and cyanate oligomers, 22 were prepared, and investigations on a poly(arylene ether phenyl phosphine oxide/sulfone) copolymer/phenoxy resin model blend system showed that the miscibility of the two components could be achieved; this depended on the molar content of phosphine oxide in the copolymer. 23,24 The specific interaction (hydrogen bonding) between the phosphonyl groups of the copolymer and hydroxyl groups of the phenoxy resin was demonstrated to be the driving force for miscibility.…”