Semicrystalline poly(aryl ether ketone)s (PAEKs) represent an industrially important class of high-performance engineering thermoplastics with excellent physicochemical and mechanical properties, and the synthesis of PAEKs with enhanced glass transition temperatures (T_g) and moderate melting temperatures (T_m) is highly desirable. In the work reported, novel poly(ether ketone ketone)s (PEKKs) containing 1,4-naphthylene units in main chains were synthesized by Friedel–Crafts solution copolycondensation of terephthaloyl chloride with a mixture of diphenyl ether and 1,4-di(4-phenoxybenzoyl)naphthalene (1,4-DPOBN). The polymerization proceeded smoothly in 1,2-dichloroethane in the presence of anhydrous AlCl₃ and N-methylpyrrolidone under mild conditions and afforded polymers having inherent viscosities of 0.66–0.98 dL g⁻¹. The polymers with 5–30 mol% 1,4-DPOBN are semicrystalline and have obviously enhanced T_g over commercial poly(ether ether ketone)s and PEKKs due to the incorporation of rigid and bulky 1,4-naphthylene moieties into the main chain. The polymers with 20–30 mol% 1,4-DPOBN not only have high T_g of 175–177 °C, but also relatively low T_m of 331–336 °C, having high potential for melt processing. The polymers with 20–30 mol% 1,4-DPOBN also exhibit excellent thermal stability and good mechanical and solvent-resistance properties. © 2021 Society of Chemical Industry

中文翻译：

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含1,4-萘基单元的新型聚醚酮酮亲电溶液共缩聚的合成及性能

半结晶聚芳醚酮 (PAEKs) 是工业上重要的一类高性能工程热塑性塑料，具有优异的物理化学和机械性能，合成的 PAEKs 具有更高的玻璃化转变温度 ( T _g ) 和中等熔化温度 ( T _m ) 是非常可取的。在报道的工作中，通过对苯二甲酰氯与二苯醚和 1,4-二（二苯醚）的混合物的弗里德尔-克拉夫茨溶液共缩聚反应合成了主链中含有 1,4-萘基单元的新型聚（醚酮酮）（PEKKs）。 4-苯氧基苯甲酰基）萘（1,4-DPOBN）。在无水AlCl ₃和N存在下，聚合在1,2-二氯乙烷中顺利进行-甲基吡咯烷酮在温和条件下得到的聚合物的特性粘度为 0.66–0.98 dL g ^-1。具有 5-30 mol% 1,4-DPOBN 的聚合物是半结晶的，并且由于在主链中引入了刚性和庞大的 1,4-萘基部分，T _g明显高于商业聚（醚醚酮）和 PEKK . 含有 20–30 mol% 1,4-DPOBN 的聚合物不仅具有175–177 °C 的高T _g，而且具有 331–336 °C 的较低T _m，具有很高的熔融加工潜力。含有 20-30 mol% 1,4-DPOBN 的聚合物还表现出优异的热稳定性和良好的机械和耐溶剂性能。© 2021 化学工业协会