Poly(biphenylene oxide)s (PBPOs) containing two pendent trifluoromethyl groups were synthesized from AB-type monomers, 4ʹ-hydroxy-4-fluoro-3,5-bis(trifluoromethyl)biphenyl and its 3ʹ-hydroxyl isomer. The displacement reaction of fluorine leaving group activated by the two trifluoromethyl groups at the ortho-positions produced high-molecular-weight polymers with M_n up to 101,000 g/mol, indicating the nucleophilic aromatic substitution reaction proceeded effectively. PBPOs with para-, meta-, and mixed ether linkages were obtained and well characterized by FTIR and ¹H/¹⁹F NMR spectroscopies. All PBPOs were amorphous and soluble in a wide range of organic solvents, and exhibited even more enhanced thermal stability than the previously reported two meta-trifluoromethyl substituted analogues. Increasing the para-linkage fraction in the polymer generally improved solubility and increased T_g in contrast to the meta-trifluoromethyl case, where para-linked polymer was poorly soluble and semicrystalline. This suggests that the ortho-trifluoromethyl substituents are more effective for the synthesis of para-linked PBPOs. They also showed low refractive indices and birefringence values.

由AB型单体4′-羟基-4-氟-3，5-双（三氟甲基）联苯及其3′-羟基异构体合成了含两个悬垂的三氟甲基的聚（联苯醚）（PBPOs）。由两个三氟甲基在邻位活化的氟离去基团的置换反应产生了M _n高达101,000 g / mol的高分子量聚合物，表明亲核芳族取代反应有效地进行了。获得了具有对，间和混合醚键的PBPO ，并通过FTIR和¹ H / ^19对其进行了很好的表征F NMR光谱学。所有的PBPO都是无定形的，可溶于多种有机溶剂，并且比以前报道的两个间-三氟甲基取代的类似物表现出更高的热稳定性。增加对位在聚合物通常改善的溶解性-键部分和增加Ť_克在对比的间位-三氟甲基的情况下，其中对位-连接的聚合物是难溶的和半结晶的。这表明邻-三氟甲基取代基对于合成对位连接的PBPO更有效。它们还显示出低折射率和双折射值。