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Experimental studies of dynamic compression of cellulose pulp fibers

Sustainable Materials and Technologies, 2023-12, Vol.38, p.e00774, Article e00774 [Peer Reviewed Journal]

ISSN: 2214-9937 ;EISSN: 2214-9937 ;DOI: 10.1016/j.susmat.2023.e00774

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  • Title:
    Experimental studies of dynamic compression of cellulose pulp fibers
  • Author: Kulkarni, Rohan Ajit ; Apazidis, Nicholas ; Larsson, Per Tomas ; Lundell, Fredrik ; Söderberg, L. Daniel
  • Subjects: Accessibility ; Cell wall ; Cellulose fiber modification ; Computations ; Dynamic compression ; High-pressure ; X-ray scattering
  • Is Part Of: Sustainable Materials and Technologies, 2023-12, Vol.38, p.e00774, Article e00774
  • Description: The ability to control the structure of the wood-pulp fiber cell wall is an attractive means to obtain increased accessibility to the fiber interior, providing routes for functionalization of the fibers that support further processing and novel material concepts, e.g. improved degree of polymerization, nanofiltration as demonstrated in previous studies. It has been proposed that dynamic compression and decompression of the cellulose pulp fibers in the wet state make it possible to modify the cell wall significantly. We hypothesize that hydrostatic pressure exerted on fibers fully submerged in water will increase the accessibility of the fiber wall by penetrating the fiber through weak spots in the cell wall. To pursue this, we have developed an experimental facility that can subject wet cellulose pulp samples to a pressure pulse -10 ms long and with a peak pressure of -300 MPa. The experiment is thus specifically designed to elucidate the effect of a rapid high-pressure pulse passing through the cellulose sample and enables studies of changes in structural properties over different size ranges. Different characterization techniques, including Scanning electron microscopy, X-ray diffraction, and wide- and small-angle X-ray scattering, have been used to evaluate the material exposed to pulsed pressure. The mechanism of pressure build-up is estimated computationally to complement the results. Key findings from the experiments consider a decrease in crystallinity and changes in the surface morphology of the cellulose sample.
  • Language: English
  • Identifier: ISSN: 2214-9937
    EISSN: 2214-9937
    DOI: 10.1016/j.susmat.2023.e00774
  • Source: Alma/SFX Local Collection
    SWEPUB Freely available online
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