A series of novel poly(ether ketone) copolymers with different contents of fluorene groups were synthesized. The effects of fluorene group content on the thermal and mechanical properties of poly(ether ketone) copolymers were investigated. The introduction of a low content of fluorene groups can lead to an increase in glass transition temperature, thermal stability and heat deflection temperature. Among them, the heat deflection temperature of 10% fluorene‐containing poly(ether ketone) copolymers (PEK‐FD10) increases from 178 °C (pure poly(ether ketone)) to 196 °C, which means that the material has a higher heat resistance rating. Compared with poly(ether ketone)s, these copolymers have excellent mechanical properties. When the content of fluorene groups is only 2% (PEK‐FD2), the strength is significantly improved. And the flexural strength of PEK‐FD2 is 149.3 MPa, which is 12% higher than that of poly(ether ketone). It is worth noting that the fracture toughness and impact toughness are also increased significantly. The strain at break of PEK‐FD2 is up to 88% and the impact toughness of PEK‐FD2 is 54.6 J m⁻¹. This suggests that the introduction of minute contents of fluorene groups can simultaneously increase the strength and toughness. © 2020 Society of Industrial Chemistry

中文翻译：

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通过引入芴基增强聚醚酮及其对热和机械性能的影响

合成了一系列具有不同芴基含量的新型聚醚醚共聚物。研究了芴基含量对聚醚酮共聚物热力学性能的影响。引入低含量的芴基可导致玻璃化转变温度，热稳定性和热变形温度增加。其中，含10％芴的聚醚醚酮共聚物（PEK-FD10）的热变形温度从178°C（纯聚醚醚酮）提高到196°C，这意味着该材料具有更高的耐热等级。与聚醚酮相比，这些共聚物具有出色的机械性能。当芴基的含量仅为2％（PEK-FD2）时，强度显着提高。PEK-FD2的抗弯强度为149.3 MPa，比聚醚酮高12％。值得注意的是，断裂韧性和冲击韧性也显着提高。PEK-FD2的断裂应变高达88％，PEK-FD2的冲击韧性为54.6 J m^-1。这表明引入微量的芴基可以同时提高强度和韧性。©2020工业化学学会