Molybdenum disulphide—A traditional external lubricant that shows interesting interphase properties in pulp-based composites
Journal article, 2021

Compression molded composites were prepared through a water-assisted mixing of an aqueous suspension of poly(ethylene-co-acrylic acid), additive, and pulp fibers [thermomechanical pulp (TMP) or dissolving pulp (DP)]. The lubricating additives used were magnesium stearate (MgSt) and molybdenum disulphide (MoS2). The composite materials had dry pulp contents ranging from 30 to 70 wt% and 5 wt% additive relative to the weight of the pulp. The adsorption of the additives onto the fibers was confirmed by scanning electron microscopy and energy dispersive X-ray analysis. DMA showed that MgSt and MoS2 gave similar interphase properties for the TMP samples at all loading contents, but the combination of MgSt and MoS2 improved the overall properties of the DP-based composites. The tensile modulus, at 70 wt% fiber content (TMP or DP), increased compared to the matrix by a factor of 6.3 and 8.1, without lubricants, and by a factor of 8 and 10.7, with lubricants, respectively. The increase in melt viscosity observed for the lubricated samples was greater for the TMP-based samples containing MoS2. At a lubricant content of 5 wt%, in 30 wt% TMP, the MoS2 behaved as both a lubricant and compatibilizer.

mechanical properties

molybdenum disulphide

thermomechanical pulp

interphase

Author

Seyedehsan Hosseini

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry, Physical Chemistry

Wallenberg Wood Science Center (WWSC)

Abhijit Venkatesh

Chalmers, Industrial and Materials Science, Engineering Materials

Antal Boldizar

Chalmers, Industrial and Materials Science, Engineering Materials

Gunnar Westman

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Polymer Composites

0272-8397 (ISSN) 1548-0569 (eISSN)

Vol. In Press

Subject Categories

Polymer Chemistry

Paper, Pulp and Fiber Technology

Polymer Technologies

DOI

10.1002/pc.26197

More information

Latest update

7/22/2021