Preparation and physical properties of intrinsic low-k polyarylene ether nitrile with enhanced thermo-stability
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ORIGINAL PAPER
Preparation and physical properties of intrinsic low‑k polyarylene ether nitrile with enhanced thermo‑stability Qi Wang1 · Zejun Pu1 · Xiaoyi Zheng1 · Yuhan Tian1 · Xinyue Li1 · Jiachun Zhong1 Received: 14 June 2020 / Accepted: 5 October 2020 © The Polymer Society, Taipei 2020
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. Keywords Polyarylene ether nitrile · BHPF · Thermal stability · Dielectric properties
Introduction Polyarylene ether nitrile (PEN) [1–4], as a kind of excellent engineering plastics and structural polymer materials, has outstanding properties for instance high mechanical strength and heat stability, good chemical and radioactive resistance, etc. Therefore, PEN resins have been widely used in the field of automotive, aerospace, electrical [5, 6], electronic fields [7–10]. In general, polymers with ether bonds and benzene rings in their chains exhibit outstanding mechanical properties and heat stability. Moreover, PEN is kind of highperformance engineering plastics and typical aromatic ring polymer materials, which has an improved heat resistance in comparison to polyimides (PIs) and polyarylene ether * Zejun Pu [email protected] * Jiachun Zhong [email protected] 1
College of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province, Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities, Sichuan University of Science & Engineering, Zigong 643000, China
sulfone (PES) [11, 12] due to the introduction of the nitrile groups (-CN) on the side chains. In addition, the introduction of nitrile groups also increase the polarity of the polymer. The increasing polarity of PEN leads to the high dielectric constant so the copolymers are applied to dielectric and packaging material in the microelectronics industry. Special engineering thermoplastics, for instance, poly(
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