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    Author(s): Jun Peng; Thomas Ellingham; Ron Sabo; Lih-Sheng Turng; Craig M. Clemons
    Date: 2014
    Source: Cellulose, Volume 21, 2014; pp. 4287-4298.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: View PDF  (1.31 MB)

    Description

    Short cellulose nanofibrils (SCNF) were investigated as reinforcement for polyvinyl alcohol (PVA) fibers. SCNF were mechanically isolated from hard wood pulp after enzymatic pretreatment. Various levels of SCNF were added to an aqueous PVA solution, which was gel-spun into continuous fibers. The molecular orientation of PVA was affected by a combination of wet drawing during gel spinning and post-hot-drawing at a high temperature after drying. A maximum total draw ratio of 27 was achieved with various SCNF contents investigated. The PVA crystal orientation increased when small amounts of SCNF were added, but decreased again as the SCNF content was increased above about 2 or 3 %, likely due to SCNF percolation resulting in network formation that inhibited alignment. SCNF fillers were effective in improving PVA fiber tensile properties (i.e., ultimate strength and elastic modulus). For example, the ultimate strength and modulus of PVA/SCNF composite fiber with a SCNF weight ratio of 6 were nearly 60 and 220 % higher than that of neat PVA. Shifts in the Raman peak at ~ 1,095 cm-1, which were associated with the C-O-Cglycosidic bond of SCNF, indicated good stress-transfer between the SCNF and the PVA matrix due to strong interfacial hydrogen bonding. Cryogenic fractured scanning electron microscopy images of filled and unfilled PVA fibers showed uniform SCNF dispersion.

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    Citation

    Peng, Jun; Ellingham, Thomas; Sabo, Ron; Turng, Lih-Sheng; Clemons, Craig M. 2014. Short cellulose nanofribrils as reinforcement in polyvinyl alcohol fiber. Cellulose, Volume 21, 2014; pp. 4287-4298.

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    Keywords

    short cellulose nanofibrils, gel spinning, polyvinyl alcohol, nanocomposites, stress transfer, crystal orientation

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