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How does Pickering Emulsion Pre-treatment Influence the Properties of Wood Flour and its Composites with High-Density Polyethylene?

1
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
2
Engineering Research Center of Fast-growing Trees and Agri-fiber Materials of Jiangsu Province, Nanjing 210037, China
3
MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(7), 1115; https://doi.org/10.3390/polym11071115
Received: 20 May 2019 / Revised: 14 June 2019 / Accepted: 15 June 2019 / Published: 1 July 2019
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Abstract

Silica synergistically stabilized paraffin Pickering emulsion is applied to modify wood flour (WF) for preparing wood/polymer composites. The effect of Pickering emulsion on properties of the WF and its composites with high-density polyethylene (HDPE) is investigated. The impregnation of paraffin Pickering emulsion could significantly improve the WF dispersion in HDPE matrix, resulting in increased melt flow index (MFI). It increased from 1.3 g/10 min (control) to 2.1 g/10 min (Pickering treatment) due to the lubrication of paraffin and rolling friction provided by silica nanoparticles. The hydrophobicity of the WF was improved by the penetration of paraffin and silica in the cell wall, which could consume the hydroxyl groups in WFs via hydrogen bonding. Owing to the well distribution of WFs and silica, the mechanical properties and surface hardness of the composites were enhanced obviously. The optimal tensile strength and impact strength increased 23% (18.28 MPa) and 32% (14.16 KJ/m2), respectively. It also could be attributed to the improved interfacial compatibility due to the incorporation of surfactants (Span 80 and Tween 80), which acted as a coupling agent. Furthermore, the silica incorporated in the WF could compensate the negative effect of paraffin on thermal stability of the composites. A model concerning the interactions in the composites was proposed based on the research results. View Full-Text
Keywords: paraffin Pickering emulsion; wood flour treatment; high-density polyethylene; wood/polymer composites; properties analysis paraffin Pickering emulsion; wood flour treatment; high-density polyethylene; wood/polymer composites; properties analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jiang, J.; Mei, C.; Pan, M.; Cao, J. How does Pickering Emulsion Pre-treatment Influence the Properties of Wood Flour and its Composites with High-Density Polyethylene? Polymers 2019, 11, 1115.

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