TY - JOUR

T1 - Longitudinal and transverse low frequency viscoelastic characterization of wood pulp fibers at different relative humidity

AU - Czibula, Caterina

AU - Seidlhofer, Tristan

AU - Ganser, Christian

AU - Hirn, Ulrich

AU - Teichert, Christian

N1 - Publisher Copyright: © 2021

PY - 2021/4/16

Y1 - 2021/4/16

N2 - The viscoelastic behavior of wood pulp fibers plays a fundamental role in the performance of paper and paper products. Wood pulp fibers are hierarchical composites consisting of different cell wall layers and have anisotropic properties. Since accessing the individual fibers is challenging, no measurement technique has been able to characterize the viscoelastic properties in both – the longitudinal and transverse – fiber direction yet. Here, an atomic force microscopy (AFM)-based method is applied to investigate the viscoelastic properties of wood pulp fibers at varying relative humidity (RH) in both fiber directions. Experimental creep tests have been performed to investigate the material's low frequency regime response. A spring-dashpot model has been applied to characterize the viscoelastic behavior. The results indicate surprisingly small differences of the properties between the fiber directions. Transferring the results into a spectral representation explains an opposing trend of the viscosity that is connected to the long-term behavior.

AB - The viscoelastic behavior of wood pulp fibers plays a fundamental role in the performance of paper and paper products. Wood pulp fibers are hierarchical composites consisting of different cell wall layers and have anisotropic properties. Since accessing the individual fibers is challenging, no measurement technique has been able to characterize the viscoelastic properties in both – the longitudinal and transverse – fiber direction yet. Here, an atomic force microscopy (AFM)-based method is applied to investigate the viscoelastic properties of wood pulp fibers at varying relative humidity (RH) in both fiber directions. Experimental creep tests have been performed to investigate the material's low frequency regime response. A spring-dashpot model has been applied to characterize the viscoelastic behavior. The results indicate surprisingly small differences of the properties between the fiber directions. Transferring the results into a spectral representation explains an opposing trend of the viscosity that is connected to the long-term behavior.

KW - Atomic force microscopy

KW - Humidity dependence

KW - Viscoelastic creep

KW - Wood pulp fiber

KW - characterization of wood pulp fibers

UR - http://www.scopus.com/inward/record.url?scp=85104595197&partnerID=8YFLogxK

U2 - 10.1016/j.mtla.2021.101094

DO - 10.1016/j.mtla.2021.101094

M3 - Article

AN - SCOPUS:85104595197

VL - 16.2021

JO - Materialia

JF - Materialia

SN - 2589-1529

IS - May

M1 - 101094

ER -