Epoxy nanocomposites containing magnetite-carbon nanofibers aligned using a weak magnetic field

POLYMER

卷:68

Article

Wu, Shuying¹  Ladani, Raj B.¹  Zhang, Jin²  Kinloch, Anthony J.³  Zhao, Zhiheng⁴  Ma, Jun⁴  Zhang, Xuehua⁵  Mouritz, Adrian P.¹  Ghorbani, Kamran⁶  Wang, Chun H.¹ 

[1] RMIT Univ, Sch Aerosp Mech & Mfg Engn, Sir Lawrence Wackett Aerosp Res Ctr, Melbourne, Vic 3001, Australia

[2] Deakin Univ, Inst Frontier Mat, Australian Future Fibres Res & Innovat Ctr, Geelong, Vic 3220, Australia

[3] Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2BX, England

[4] Univ S Australia, Sch Adv Mfg & Mech Engn, Adelaide, SA 5095, Australia

[5] RMIT Univ, Sch Civil Environm & Chem Engn, Melbourne, Vic 3001, Australia

[6] RMIT Univ, Sch Elect & Comp Engn, Melbourne, Vic 3001, Australia

关键词: Carbon nanofibers;    Magnetic field alignment;    Epoxy nanocomposites;   

DOI  :  10.1016/j.polymer.2015.04.080

来源: Elsevier

【 摘 要 】

Novel magnetite-carbon nanofiber hybrids (denoted by Fe3O4@CNFs) have been developed by coating carbon nanofibers (CNFs) with magnetite nanoparticles in order to align CNFs in epoxy using a relatively weak magnetic field. Experimental results have shown that a weak magnetic field (similar to 50 mT) can align these newly-developed nanofiber hybrids to form a chain-like structure in the epoxy resin. Upon curing, the epoxy nanocomposites containing the aligned Fe3O4@CNFs show (i) greatly improved electrical conductivity in the alignment direction and (ii) significantly higher fracture toughness when the Fe3O4@CNFs are aligned normal to the crack surface, compared to the nanocomposites containing randomly-oriented Fe3O4@CNFs. The mechanisms underpinning the significant improvements in the fracture toughness have been identified, including interfacial debonding, pull-out, crack bridging and rupture of the Fe3O4@CNFs, and plastic void growth in the polymer matrix. (C) 2015 The Authors. Published by Elsevier Ltd.

【 授权许可】

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