Mild alkaline separation of fiber bundles from eucalyptus bark and their composites with cellulose acetate butyrate


High surface lignin content (i.e. 34.6 %) sclerenchyma fiber bundles were successfully isolated with a yield of 71 % by a mild alkali (NaOH dosage of 5 wt%) extraction of eucalyptus (Eucalyptus globulus) bark under 100 degrees C for 60 min.. The mechanical properties of the composites prepared by hot pressing of cellulose acetate butyrate (CAB) sheets with the fiber bundles were evaluated. The fiber bundles exhibited good compatibility with CAB due to their hydrophobic fiber surfaces. The mechanical properties of the fiber bundle/ cellulose acetate butyrate composites revealed the maximum at a weight ratio of 25:75, which demonstrates the promise of utilizing these isotropic aligned fiber bundles as the reinforcement to the cellulose acetate butyrate without the addition of plasticizers for composite uses.




Agricultural Engineering; Agronomy


Dou, JZ; Karakoc, A; Johansson, LS; Hietala, S; Evtyugin, D; Vuorinen, T

nossos autores


This work made use of the Aalto University Nanomicroscopy Center (Aalto-NMC) premises. The authors thank Rita Hatakka from Aalto University for her skillful assistance in HPAEC measurement. This work was a part of the Academy of Finland's Flagship Programme under Projects No. 318890 and 318891 (Competence Center for Materials Bioeconomy, FinnCERES). Authors thank RAIZ (Portuguese Research Institute on Forestry and Paper) for supplying the eucalyptus bark sample used within the scope of the project Inpactus -innovative products and technologies from eucalyptus, Project N.degrees 21874 funded by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of COMPETE 2020 n degrees 246/AXIS II/2017.

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