High molecular weight of poly(acrylonitrile- co -3-aminocarbonyl-3-butenoic acid methyl ester) used as carbon fiber prec
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High molecular weight of poly(acrylonitrile‑co‑3‑aminocarbonyl‑3‑butenoic acid methyl ester) used as carbon fiber precursor: preparation and stabilization Anqi Ju1 · Huifang Chen1 · Shengfei Hou1 · Houyong Yu3 · Ling Liu1 · Xuepeng Ni1 · Mengjuan Li2 Received: 6 June 2019 / Accepted: 9 February 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract A bifunctional 3-aminocarbonyl-3-butenoic acid methyl ester (ABM) was used to prepare high molecular weight poly(acrylonitrile-co-3-aminocarbonyl-3-butenoic acid methyl ester) [P(AN-co-ABM)] by suspension polymerization in aqueous medium. The influence of ABM monomer feed ratios on the structure and stabilization of P(AN-co-ABM) was characterized by element analysis, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Based on reactivity ratio calculation, the comonomer ABM possesses greater reactivity than acrylonitrile. The molecular weight of P(AN-co-ABM) in this work is 10 times larger, as compared to the one prepared by solution polymerization; it is the key to producing high-performance carbon fiber. The FTIR, XRD and DSC results illustrate that the stabilization of P(AN-co-ABM) is significantly improved as compared with PAN homopolymer and P(AN-AA-MA), for instance, lower initiation temperature, smaller cyclization activation energy (Ea), broadened exothermic peak and larger stabilization extent, due to the ionic cyclization initiated by ABM, which makes the resultant P(AN-co-ABM) a potential precursor for carbon fiber. Keywords Polyacrylonitrile · 3-Aminocarbonyl-3-butenoic acid methyl ester · Suspension polymerization · High molecular weight · Stabilization
Introduction The carbon fiber (CF) has a wide range of applications in military field, sporting products, medical gadgets and other civilian products; the production of it increases abruptly. At present, 90% of CFs are made from PAN-based precursor for its exceptionally wide range of implementation and excellent comprehensive performance [1–4]. On the other * Mengjuan Li [email protected] 1
College of Materials Science and Engineering and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
2
Key Laboratory of Eco‑textiles, Ministry of Education and College of Textile and Clothing, Jiangnan University, Wuxi 214122, China
3
The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, China
hand, PAN homopolymer cannot be able to function as a precursor of carbon fiber owing to poor processability, high stabilization temperature and centralized heat discharge in the pre-oxidation process. Therefore, a small amount of comonomers are incorporated into PAN homopolymer to improve spinnability and stretchability, particularly to stimulate the stabilization [5]. Acid comonomers, such as acrylic acid (AA) [6], methylacrylic acid (MAA) [7] an
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