AI Article Synopsis
- The study investigates how wood fiber (WF) affects the surface properties of polymer composites made with non-recycled and recycled polypropylene (PP and R-PP) through melt compounding and injection molding.
- ATR-FTIR analysis reveals that functional groups from WF become more prominent at the surface with up to 30% WF loading, while optical microscopy shows that the addition of WF leads to a thinner skin layer in the composites.
- Additionally, surface zeta potential measurements indicate that increased WF content enhances the hydrophilicity, and WF contributes antioxidant properties as identified through DPPH assays.
Article Abstract
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.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8151087 | PMC |
| http://dx.doi.org/10.3390/polym13101535 | DOI Listing |
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