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Nanoindentation study of individual cellulose nanowhisker-reinforced PVA electrospun fiber

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Abstract

Electrospun poly(vinyl alcohol) (PVA) fiber and its composites have been widely studied recently. However, most physical properties reported in literature are measured from a nanofiber web. In this study, for the first time, the mechanical properties of individual electrospun fiber, rather than fiber web, of cellulose nanowhisker-reinforced poly(vinyl alcohol) was studied using nanoindentation technique. The modulus is 2.1 GPa for a pure PVA electrospun fiber, and 7.6 GPa for 20.0 wt% cellulose nanowhisker-reinforced PVA electrospun fiber, respectively. The modulus of PVA/cellulose nanowhisker electrospun fibers increases linearly with increasing loading ratio of cellulose nanowhiskers up to 20.0 wt%. The experimental results were compared with that calculated using isotropic and longitudinal Halpin–Tsai models. The modules of the cellulose nanowhiskers are 60–80 % higher than the isotropic model predictions but lower than longitudinal model prediction, suggesting the nanowhiskers are partially aligned to the electrospun fiber direction.

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Authors and Affiliations

  1. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 500 10th street N.W., Atlanta, GA, 30332-0620, USA

    Jihoon Lee & Yulin Deng

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  1. Jihoon Lee
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  2. Yulin Deng
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Correspondence to Yulin Deng.

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Lee, J., Deng, Y. Nanoindentation study of individual cellulose nanowhisker-reinforced PVA electrospun fiber. Polym. Bull. 70, 1205–1219 (2013). https://doi.org/10.1007/s00289-012-0842-7

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  • DOI: https://doi.org/10.1007/s00289-012-0842-7

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