Mechanical properties of bio-based sandwich composites containing recycled polymer textiles

Pooria Khalili*, Mikael Skrifvars, Hom Nath Dhakal, Saeid Hosseinpour Dashatan, Mikael Danielsson, Alèxia Feiner Gràcia

*Corresponding author for this work

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In this paper, sandwich composites were produced by compression moulding techniques, and they consisted of regenerated cellulose fabric (rayon) and bio-based polypropylene (PP) to form facings, while virgin and recycled polyamide (PA) textiles were used as core materials. To compare the mechanical performance between sandwich composites and typical composite designs, a control composite was produced to deliver the same weight and fiber mass fraction from rayon and PP. To evaluate the influence of recycled textile on the mechanical properties of the composites, a series of flexural, low velocity impact (LVI) and tensile tests were performed. It was found that the incorporation of thicker PA textile enhanced the bending stiffness by two times and the peak flexural force by 70% as compared to those of control. Substitution of a layer of recycled textile for two layers of rayon provided a good level of impact energy absorption capacity (~28 J) and maximum force (~4893–5229 N). The tensile strength of the four sandwich composites was reported to be in the range of 34.20 MPa and 46.80 MPa. This value was 91.90 for the control composite. The 2D cross-section slices of the composite specimens did not show any evidence of fiber tow debonding, fiber bundle splitting, or delamination.

Original languageEnglish
Article number3815
Number of pages14
Issue number18
Publication statusPublished - 19 Sept 2023


  • impact behaviour
  • mechanical properties
  • regenerated cellulose
  • sandwich composites

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