Polyarylene ether nitrile (PEN) random copolymers were prepared from 6AF, BHPF, and 2, 6-dichlorobenzonitrile according to the nucleophilic aromatic substitution polymerization. The chemical structure of PEN random copolymers was characterized by the FT-IR and ¹H-NMR spectrum, respectively. The thermal properties of the PEN random copolymers were investigated by using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The resulting PEN copolymers have excellent thermal stability with high glass transition temperature (T_g) ranging from 187℃ to 271℃ and the 5% weight loss temperature (T_5%) of PEN copolymers greater than 490℃ in nitrogen atmospheres. Meanwhile, the PEN films have excellent mechanical property, the tensile strength ranges from 55 to 95 MPa. Moreover, the dielectric properties of the PEN random copolymers were investigated by dielectric tests. The dielectric constants (k) and loss tangent (tan δ) of PEN (PEN-6-AF/BHPF100) film is only 2.3 and 0.03 at 1 kHz, respectively. More importantly, the dielectric properties were found to be relatively stable until the T_g, which can be attributed to the existence of BHPF units in the molecular backbone.

根据亲核芳香取代聚合反应，由6AF，BHPF和2，6-二氯苄腈制备了聚亚芳基醚腈（PEN）无规共聚物。PEN无规共聚物的化学结构分别通过FT-IR和¹ H-NMR光谱表征。通过差示扫描量热法（DSC）和热重分析（TGA）研究了PEN无规共聚物的热性能。所得的PEN共聚物具有出色的热稳定性，在187℃至271℃的高玻璃化转变温度（T _g）和5％失重温度（T _5％氮气氛下大于490℃的PEN共聚物）。同时，PEN膜具有优异的机械性能，拉伸强度范围为55至95 MPa。此外，通过介电试验研究了PEN无规共聚物的介电性能。PEN（PEN-6-AF / BHPF100）薄膜的介电常数（k）和损耗角正切（tanδ）在1 kHz时分别仅为2.3和0.03。更重要的是，发现介电性能在T _g之前是相对稳定的，这可以归因于分子主链中BHPF单元的存在。