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    Author(s): Caitlin E. Meree; Gregory T. Schueneman; J. Carson Meredith; Meisha L. Shofner
    Date: 2016
    Source: Cellulose, Vol. 23(5). pp. 3001-3012
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: View PDF  (785.0 KB)

    Description

    Recent emphasis on the pilot scale production of cellulosic nanomaterials has increased interest in the effective use of these materials as reinforcements for polymer composites. An important, enabling step to realizing the potential of cellulosic nanomaterials in their applications is the materials processing of CNC/polymer composites through multiple routes, i.e. melt, solution, and aqueous processing methods. Therefore, the objective of this research is to characterize the viscoelastic behavior of aqueous nanocomposite suspensions containing cellulose nanocrystals (CNCs) and a water-soluble polymer, poly(vinyl alcohol) (PVA). Specifically, small amplitude oscillatory shear measurements were performed on neat PVA solutions and CNC-loaded PVA suspensions. The experimental results indicated that the methods used in this study were able to produce highquality nanocomposite suspensions at high CNC loadings, up to 67 wt% with respect to PVA. Additionally, the structure achieved in the nanocomposite suspensions was understood through component attributes and interactions. At CNC loadings near and less than the percolation threshold, a polymer mediated CNC network was present. At loadings well above the percolation threshold, a CNC network was present, indicated by limited molecular weight dependence of the storage modulus. Overall, these results provide increased fundamental understanding of CNC/PVA suspensions that can be leveraged to develop advanced aqueous processing methods for these materials.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Meree, Caitlin E.; Schueneman, Gregory T.; Meredith, J. Carson; Shofner, Meisha L. 2016. Rheological behavior of highly loaded cellulose nanocrystal/poly(vinyl alcohol) composite suspensions. Cellulose. 23(5): 3001-3012.

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    Keywords

    Poly(vinyl alcohol), Cellulose nanocrystals, Rheology, Nanocomposite, Cellulose, Viscoelasticity, Poly(vinyl alcohol), Cellulose nanocrystals, Rheology, Nanocomposite, Cellulose, Viscoelasticity

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