20.500.12556/RUL-127415 Insight into the surface properties of wood fiber-polymer composites The surface properties of wood fiber (WF) filled polymer composites depend on the filler loading and are closely related to the distribution and orientation in the polymer matrix. In this study, wood fibers (WF) were incorporated into thermoplastic composites based on non-recycled polypropylene (PP) and recycled (R-PP) composites by melt compounding and injection moulding. ATR-FTIR (attenuated total reflection Fourier transform infrared spectroscopy) measurements clearly showed the propagation of WF functional groups at the surface layer of WF-PP/WF-R-PP composites preferentially with WF loading up to 30%. Optical microscopy and nanoindentation method confirmed the alignment of thinner skin layer of WF-PP/WF-R-PP composites with increasing WF addition. The thickness of the skin layer was mainly influenced by the WF loading. The effect of the addition of WF on modulus and hardness, at least at 30 and 40 wt.%, varies for PP and R-PP matrix. On the other hand, surface zeta potential measurements show increased hydrophilicity with increasing amounts of WF. Moreover, WF in PP/R-PP matrix is also responsible for the antioxidant properties of these composites as measured by DPPH (2,2′-diphenyl-1-picrylhydrazyl) assay. wood-fibers polypropylene composites surface properties skin-core structure sustainable and biodegradable composites ATR-FTIR zeta potential measurement nanoindentation DPPH assay lesna vlakna polipropilenski kompoziti površinske lastnosti vlaken struktura skorja-jedro biorazgradljivi kompoziti meritve zeta potenciala nanovtiskovanje true false true Angleški jezik Slovenski jezik Članek v reviji 2021-06-04 13:52:34 2021-06-04 13:52:36 2022-09-06 03:51:16 0000-00-00 00:00:00 2021 0 0 24 str. iss. 10, art. 1535 Vol. 13 May 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 677.017:544.7 2073-4360 10.3390/polym13101535 62964739 RAZ_Pusnik_Cresnar_Klementina_2021.pdf RAZ_Pusnik_Cresnar_Klementina_2021.pdf 1 7D8910F56AB0C2ABF89D00B54DCB849D 637767a3a9d29ffc39108d2260a3170c33a03477eb08d98d01269dff439507fd b0290469-a8fb-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154735 https://www.mdpi.com/2073-4360/13/10/1535 0 aa7fafe1-c52d-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=143815 Fakulteta za strojništvo 0 0 0