Radial structure and property relationship in the thermal stabilization of PAN precursor fibres |
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| Institution: | 1. Deakin University, Carbon Nexus, Institute for Frontier Materials, Geelong, Australia;2. Factory of the Future, Swinburne University of Technology, Hawthorn, Australia;1. Department of Organic and Nano Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea;2. Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea;1. Korea Institute of Materials Science, 797 Changwondaero, Changwon 642-831, South Korea;2. Agency for Defense Development, Yuseong PO Box 35, Daejeon 305-600, South Korea;3. Institute of Metal Research, 72 Wenhua Road, Shenyang 110016, China;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China;2. Shanghai JPY Ion-Tech Co. Ltd, Shanghai, 201707, China;1. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Winterbergstraße 28, 01277 Dresden, Germany;2. Technische Universität Dresden/Institute of Textile Machinery and High Performance Material Technology, Breitscheidstr. 78, 01237 Dresden, Germany;3. P-D Glasseiden GmbH Oschatz, Wellerswalder Weg 17, 04758 Oschatz, Germany;1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. National Carbon Fiber Engineering Research Center, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | Here we report on the role of oxygen in the evolution of radial heterogeneity in the fibre structure and properties of PAN fibres stabilized in air and vacuum at different temperatures. Modulus mapping by Nano-indentation showed heterogeneous modulus distribution in the fibres treated in air, while no variation in modulus was observed in fibres processed in vacuum. Raman spectroscopy and elemental analysis revealed that the temperature dependent oxygen diffusion from skin to core of the fibres assisted in the evolution of higher extent of sp2-hybridized carbons in the skin compared to core of the air treated samples. Conversely, no radial structure variations were observed in the vacuum treated fibres. Higher modulus in the skin of air-treated fibres was due to the formation of compact structures which was associated with the enhanced intermolecular interactions facilitated by the formation of C=C bonds within the polymer backbone, promoted by oxidative-dehydrogenation reaction. Supporting these observations, the fracture morphology examined by SEM showed a brittle fracture in the skin and ductile fracture in the core. |
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| Keywords: | Thermal stabilization Oxidation Radial heterogeneity Skin-core Polyacrylonitrile Carbon fibres |
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