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Polymers 2018, 10(3), 266; https://doi.org/10.3390/polym10030266

Revealing the Interface Structure and Bonding Mechanism of Coupling Agent Treated WPC

1
,
1,2,* and 1,2,*
1
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2
Department of Civil and Environmental Engineering, College of Engineering, Design and Physical Sciences, Brunel University London, Uxbridge UB8 3PH, UK
*
Authors to whom correspondence should be addressed.
Received: 27 January 2018 / Revised: 23 February 2018 / Accepted: 27 February 2018 / Published: 5 March 2018
(This article belongs to the Collection Polymeric Adhesives)
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Abstract

This paper presents the interfacial optimisation of wood plastic composites (WPC) based on recycled wood flour and polyethylene by employing maleated and silane coupling agents. The effect of the incorporation of the coupling agents on the variation of chemical structure of the composites were investigated by Attenuated total reflectance-Fourier Transform Infrared spectroscopy (ATR-FTIR) and Solid state 13C Nuclear Magnetic Resonance spectroscopy (NMR) analyses. The results revealed the chemical reactions that occurred between the coupling agents and raw materials, which thus contributed to the enhancement of compatibility and interfacial adhesion between the constituents of WPC. NMR results also indicated that there existed the transformation of crystalline cellulose to an amorphous state during the coupling agent treatments, reflecting the inferior resonance of crystalline carbohydrates. Fluorescence Microscope (FM) and Scanning Electron Microscope (SEM) analyses showed the improvements of wood particle dispersion and wettability, compatibility of the constituents, and resin penetration, and impregnation of the composites after the coupling agent treatments. The optimised interface of the composites was attributed to interdiffusion, electrostatic adhesion, chemical reactions, and mechanical interlocking bonding mechanisms. View Full-Text
Keywords: wood plastic composites; interfacial optimisation; chemical reaction; adhesion; bonding mechanism wood plastic composites; interfacial optimisation; chemical reaction; adhesion; bonding mechanism
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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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Rao, J.; Zhou, Y.; Fan, M. Revealing the Interface Structure and Bonding Mechanism of Coupling Agent Treated WPC. Polymers 2018, 10, 266.

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