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Publikācija: Hydrophilic-Hydrophobic Characteristics of Wood-Polymer Composites Filled with Modified Wood Particles

Publication Type Full-text conference paper published in conference proceedings indexed in SCOPUS or WOS database
Funding for basic activity Contract research work
Defending: ,
Publication language English (en)
Title in original language Hydrophilic-Hydrophobic Characteristics of Wood-Polymer Composites Filled with Modified Wood Particles
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Research platform None
Authors Jevgeņijs Jaunslavietis
G. Shulga
Jurijs Ozoliņš
B. Neiberte
Anrijs Verovkins
Sanita Vītoliņa
T. Betkers
Keywords Ammoxidation, Contact Angle, Hydrolysis, Surface Free Energy, Wood By-Product, Wood-Polymer Composite, Work of Adhesion
Abstract In this study, hydrophobic-hydrophilic characteristics, including contact angle and moisture sorption of a modified wood filler and the wood-polymer composites (WPC) containing it was investigated. The wood filler obtained from aspen sawdust was modified by mild acid hydrolysis and by ammoxidation. Contact angles of the wood particles and the WPC samples were measured with Kruss K100M using the Washburn and Wilhelmy methods, respectively. Work of adhesion was calculated using Young-Dupre equation. Surface free energy as well as its dispersive and polar parts were found using Owens-Wendt-Rabel-Kaelble approach. It was found that the hydrolysis and the ammoxidation led to decrease of the hemicelluloses content in the lignocellulosic matrix. Beside this, the ammoxidation favours the formation of amide bonds in the ammoxidised particles. These changes enhanced the contact angles, decreased the work of adhesion, and decreased surface free energy of the WPC samples filled with the modified particles in comparison with the WPC sample that contained the unmodified ones. The treatment of the wood particles decreased the wettability towards water, but increased it towards recycled polypropylene. This positively effects mechanical properties of the samples.
DOI: 10.4028/www.scientific.net/KEM.762.176
Hyperlink: https://www.scientific.net/KEM.762.176 
Reference Jaunslavietis, J., Shulga, G., Ozoliņš, J., Neiberte, B., Verovkins, A., Vītoliņa, S., Betkers, T. Hydrophilic-Hydrophobic Characteristics of Wood-Polymer Composites Filled with Modified Wood Particles. In: Key Engineering Materials, Latvia, Rīga, 20-20 October, 2017. Switzerland: Trans Tech Publications Inc., 2018, pp.176-181. ISSN 1662-9795. Available from: doi:10.4028/www.scientific.net/KEM.762.176
Additional information Citation count:
ID 27179