The Role of α, γ,  and Metastable Polymorphs on Electrospun Polyamide 6/Functionalized Graphene Oxide.

Macromolecular Rapid Communications
Javier MacossayJosé Bonilla-Cruz

Abstract

The present paper describes the addition of nitroxide-functionalized graphene oxide (GOFT) into polyamide 6 (PA6) micro- and nanofibers, which are obtained through electrospinning. Scanning electron microscopy micrographs demonstrate the presence of fibers. Tensile testing presents an unexpected and non-obvious behavior, in which the Young's modulus, tensile strength, and elongation simultaneously and remarkably increase compared to the pristine polymer nanofibers. GOFT induces the hydrogen bonding between the NH group from PA6 with the functional groups, thus promoting higher crystallinity of the polymer matrix. Nonetheless, deconvoluted curves by differential scanning calorimetry reveal the presence of two quasi-steady polymorphs (β and δ phases) contributing to 46% of the total crystallinity. This evidence suggests that their presence and high ratios are responsible for the unexpected and simultaneous enhancement of tensile properties.

References

Jun 23, 2009·Science·A K Geim
Dec 5, 2009·ACS Nano·Mohammad A RafieeNikhil Koratkar
Dec 22, 2009·Chemical Society Reviews·Daniel R DreyerRodney S Ruoff
Aug 25, 2010·ACS Nano·Daniela C MarcanoJames M Tour
Jul 23, 2011·Nature Materials·Alexander A Balandin
Dec 19, 2013·Carbon·Yazmin I Avila-VegaJosé Bonilla-Cruz

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