Abstract
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 (Tg) ranging from 187℃ to 271℃ and the 5% weight loss temperature (T5%) 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 Tg, which can be attributed to the existence of BHPF units in the molecular backbone.
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Acknowledgement
The authors wish to thank for the Opening Project of Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities (2018JXY04), Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan province (2019CL04) and Major Project of Education Department in Sichuan (18ZA0346), Key science and technology planning project of Zigong (2019YYJC04).
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Qi Wang and Zejun Pu contributed equally to this work, and they are the co-first author. Besides, all the authors approved the final version of the manuscript.
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Wang, Q., Pu, Z., Zheng, X. et al. Preparation and physical properties of intrinsic low-k polyarylene ether nitrile with enhanced thermo-stability. J Polym Res 27, 328 (2020). https://doi.org/10.1007/s10965-020-02311-1
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DOI: https://doi.org/10.1007/s10965-020-02311-1