Poly-p-phenylene oxide

“Radical-Controlled” Oxidative Polymerization of 4-Phenoxyphenol by a Tyrosinase Model Complex Catalyst to Poly(1,4-phenylene oxide)

“…The polymerization which had almost no C-C dimer formation at the initial stage produced polymer having T m at 171-194°C. The T m values were lower than that of the PPO obtained by the Ullmann synthesis (298°C), 17 which is ascribed to the presence of the ortho C-O linkages and/or the lower molecular weight. The polymerization catalyzed by the Cu(L iPr ) complex in toluene (entry 3) was followed (Figure 4).…”

“…The spectrum patterns of the resulting polymers (entries 1-3, 5, 6) were very similar to that of PPO synthesized by Ullmann condensation. 17 However, the polymer from PPL showed a small peak at 970 cm -1 , which was not observed in the spectrum of PPO by the Ullmann synthesis. 2,4-Diphenoxyphenol 17 and o-4 each have a peak at 970 cm -1 , but neither 4-(4-phenoxyphenoxy)phenol 17 nor p-4 has this peak at 970 cm -1 .…”

“…17 However, the polymer from PPL showed a small peak at 970 cm -1 , which was not observed in the spectrum of PPO by the Ullmann synthesis. 2,4-Diphenoxyphenol 17 and o-4 each have a peak at 970 cm -1 , but neither 4-(4-phenoxyphenoxy)phenol 17 nor p-4 has this peak at 970 cm -1 . These spectral data indicate that the 970 cm -1 peak is based on the 1,2,4-trioxybenzenes (1,2,4-unit).…”

XRD data and isomorphous behavior of several bridged poly(p-phenylene)s including new poly(biphenylene)s

“…Concerning this, an orthorhombic packing cell containing bent polymer molecules has been considered for (PhO) n . 10 It is also reported that one of two types of emeraldine base poly(aniline) (partly oxidized poly(aniline)) give rise to an XRD pattern agreeing with the face-centered lattice containing bent polymer molecules. 16 The analogous XRD patterns of (PhOPh) n and (PhNHPh) n indicate that the tendency to take a similar packing mode holds for a wide range of bridged poly(pphenylene)s including the "poly(biphenylene)" type of polymers.…”

Coupling selectivity in the radical-controlled oxidative polymerization of 4-phenoxyphenol catalyzed by (1,4,7-triisopropyl-1,4,7-triazacyclononane)copper(II) complex

“…As the solvents, aromatic, halogenated, or ether solvents were selected because they were expected to have high solubility with PPO. 17 In all the solvents except 1,4-dioxane and tetrahydrofuran (THF), no COC dimers were detected, and the p-4 selectivity decreased with an increase in the dielectric constant of the solvents (entries 2, 10 -13, 15, and 16). When 1,4-dioxane (entry 9) was used, a slight amount of oo-13 (1%) was detected, and the p-4 selectivity became low (88%), although the dielectric constant of 1,4-dioxane was the lowest in these solvents.…”