Synthesis of thermally robust benzimidazolone-based wholly aromatic polyketones

Xinming Gu; Zhipeng Wang; Honghua Wang; Guangyuan Zhou; Yanmin Zhou

doi:10.1039/d0ra09831k

Synthesis of thermally robust benzimidazolone-based wholly aromatic polyketones

RSC Adv. 2021 Jan 29;11(10):5444-5450. doi: 10.1039/d0ra09831k. eCollection 2021 Jan 28.

Authors

Xinming Gu¹, Zhipeng Wang², Honghua Wang², Guangyuan Zhou², Yanmin Zhou¹

Affiliations

¹ Department of Oral Implantology, Hospital of Stomatology, Jilin University Changchun 130021 China zhouym@jlu.edu.cn.
² Division of Energy Materials (DNL22), Dalian Institute of Chemical Physics of the Chinese Academy of Sciences Dalian 116023 China.

Abstract

A series of wholly aromatic polyketones bearing benzimidazolone moieties (PK-BI) were synthesized via N-C coupling polycondensation. Calcium carbonate coupled with potassium carbonate was used for the first time to achieve a high molecular weight, with T _g of the polymer as high as 299 °C. The polymer structure was confirmed by solid state ¹³C NMR and FT-IR. The thermal stability of wholly aromatic polyketones with a benzimidazolone unit in the main chain was significantly improved, being higher than those of PEEKs and other amorphous PAEKs, proved by thermogravimetric analysis (TGA) and derivative thermogravimetric (DTG) analysis. The degradation activation energy (E _k) values estimated by Flynn-Wall-Ozawa (FWO) and Kissinger methods were 260.33 kJ mol^-1 and 282.57 kJ mol^-1, respectively, which are higher than those of PEEKs.