Novel benzimidazole and pyridine-containing poly(ether ether ketone) s with good solubility, thermal properties and fluorescence
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3,5-bis(2-benzimidazolyl) pyridine (3,5-BP) is synthesized and a series of benzimidazolyl and pyridyl-containing poly (ether ether ketone) s (mPEEK-BPs) with precise structures and high yield are prepared through a nucleophilic displacement reaction of 3,5-BP, m-dihydroxybenzene and 4,4′-difluorobenzophenone. X-ray diffraction results show that mPEEK-BPs are amorphous. All the synthesized polymers posses high glass transition temperatures (Tg = 211~270 °C) and high thermal stability (Td5% = 506~549 °C in N2, 471~564 °C in air). The polymers have good solubilities in common organic solvents. With the increase of benzimidazole and pyridine units content, the thermal properties and solubility of the as-prepared polymers improved. Additionally, the resulted polymers exhibit excellent fluorescence performance and the fluorescence emission peak appears at 425 nm.
KeywordsPEEKs Solubility Thermal properties Fluorescence properties Benzimidazole· pyridine
This work was supported by the Scientific Research Fund of Sichuan Provincial Education Department (No. 16ZB0146), National Natural Science Foundation of China (No. 51602267) and Longshan academic talent research supporting program of SWUST (No. 18LZX552).
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