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CONCLUSIONS 1. The effect of plasma treatment on the properties of composite material made from winter wheat stalk particles was investigated. Test inks showed an increase in surface energy and confirmed that plasma treatment influences surface properties of the particles. 2. The plasma treatment of the particles had a statistically significant effect on the equilibrium moisture content of the boards and on their thickness swelling, with increased degrees of plasma treatment the equilibrium moisture content also increased. 3. Opposite of the physical properties, the positive effect of plasma pre-treatment of the particles was observed in the mechanical properties. Both the flexural strength and internal bonding of the boards were increased. The highest increase in flexural strength was achieved by the type A plasma treatment, whereas a difference between the individual types of plasma treatment was not observed in the internal bonding. 4. A better joint of the modified particle-adhesive was reached by the plasma treatment. A noticeable impact of the modification on the nature of the damage in produced composite materials was observed through SEM analysis. ACKNOWLEDGMENTS This work was supported by the Faculty of Forestry and Wood Sciences of the Czech University of Life Sciences Prague (Internal Grant Agency, Project No. B04/17), by grant "EVA4.0" (Project No. CZ.02.1.01/0.0/0.0/16_019/0000803) financed by OP RDE, and by the German Academic Exchange Service (Program ID 57299291, No. 91656606). The boards were manufactured in cooperation with the Institut für Holztechnologie Dresden gemeinnützige GmbH. Acknowledgments include Bernd Brendler for helping with the plasma aggregate preparation. REFERENCES CITED Baltazar-y-Jimenez, A., Bistritz, M., Schulz, E., and Bismarck, A. (2008). “ Atmospheric air pressure plasma treatment of lignocellulosic fibres: Impact on mechanical properties and adhesion to cellulose acetate butyrate ,” &RPSRV6FL7HFKQRO 68(1), 215-227. DOI: 10.1016/j.compscitech.2007.04.028 Bekhta, P., Korkut, S., and Hiziroglu, S. (2013). “ Effect of pretreatment of raw material on properties of particleboard panels made from wheat straw ,” %LR5HVRXUFHV 8(3), 4766-4774. DOI: 10.15376/biores.8.3.4766-4774 Cheng, S. Y., Yuen, C. W. M., Kan, C. W., Cheuk, K. K. L., Daoud, W. A., Lam, P. L., and Tsoi, W. Y. I. (2010). “ Influence of atmospheric pressure plasma treatment on various fibrous materials: Performance properties and surface adhesion analysis ,” 9DFXXP 84(12), 1466-1470. DOI: 10.1016/j.vacuum.2010.01.012 EN 319 (1993). “ Particleboards and fibreboards – Determination of tensile strength perpendicular to the plane of the board ,” European Committee for Standardization, Brussels, Belgium.
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Hýsek et al . (2018). “Cold plasma & straw board,” B io R esources 13(3), 5065-5079.
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