Abstract
In order to improve the pre-oxidation performance and molecular weight of polyacrylonitrile (PAN). In this work, 3-aminocarbonyl-3-butenoic acid methyl ester) (ABM) was used as comonomers to formulate high molecular weight poly(acrylonitrile-co-3-amino-carbonyl-3-butenoic acid methyl ester) [P(AN-co-ABM)] copolymer by radical polymerization in the mixed solvent of dimethyl sulfoxide/deionized water =60/40 (wt/wt). The highest molecular weight of resultant P(AN-co-ABM) is 4.87 × 105 g/mol, 5 times larger than that prepared by solution polymerization under the same reaction conditions. The monomer reactivity ratios are calculated by Fineman-Ross and Kelen-Tüdõs methods based on the elemental analysis results. Thermal properties of P(AN-co-ABM) copolymer with different monomer feed ratios were studied by Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry in detail. The results show that the stabilization of P(AN-co-ABM) has been significantly improved by ABM, confirmed by the lower initiation temperature and broader exothermic peak in DSC curves, larger extent of stabilization from FTIR and XRD studies, and smaller Ea of cyclization, which is due to the initiation of ABM through ionic mechanism. This study clearly shows that high molecular weight P(AN-co-ABM) copolymer is a better material for carbon fiber precursor.
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Acknowledgements
Financial support of this work from National Natural Science Foundation of China (No. 51503086), China Postdoctoral Science Foundation (No. 1893), State Key Laboratory for Modification of Chemical Fibers and Polymer (18 M1060120), The Open Project Program of Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Zhejiang Sci-Tech University), Ministry of Education (No. 2016001) and the Fundamental Research Funds for the Central Universities (NO. 17D110620) was gratefully acknowledged.
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Anqi Ju, Huifang Chen and Houyong Yu designed the research strategy; Chenglin Liu and Xuepeng Ni performed the experiments; Anqi Ju, Huifang Chen and Shengfei Hou analyzed data and wrote the paper. All the authors took part in fruitful discussions during paper preparation.
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The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.
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Liu, C., Ni, X., Chen, H. et al. High molecular weight poly(acrylonitrile-co-3-aminocarbonyl-3-butenoic acid methyl ester) prepared by mixed solvent polymerization I. effect of monomer feed ratios on polymerization and stabilization. J Polym Res 26, 276 (2019). https://doi.org/10.1007/s10965-019-1927-x
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DOI: https://doi.org/10.1007/s10965-019-1927-x