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Materials 2017, 10(3), 286; doi:10.3390/ma10030286

High-Temperature Hot Air/Silane Coupling Modification of Wood Fiber and Its Effect on Properties of Wood Fiber/HDPE Composites

1
Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, China
2
Liaoning Forestry Vocational-Technical College, Shenyang 110101, China
*
Author to whom correspondence should be addressed.
Academic Editor: Naozumi Teramoto
Received: 20 January 2017 / Revised: 26 February 2017 / Accepted: 3 March 2017 / Published: 13 March 2017
View Full-Text   |   Download PDF [6351 KB, uploaded 13 March 2017]   |  

Abstract

The surfaces of poplar wood fibers were modified using high-temperature hot air (HTHA) treatment and silane coupling agent. The single factor test was then used to investigate the performances (e.g., the change of functional groups, polarity, cellulose crystallinity, and thermal stability) of modified poplar wood fibers (mPWF) through Fourier transform infrared spectrometry, X-ray diffraction and thermo-gravimetric analysis for the subsequent preparation of wood-plastic composites (WPCs). The effect of HTHA treatment conditions—such as temperature, inlet air velocity, and feed rate—on the performances of WPCs was also investigated by scanning electron microscopy and dynamic mechanical analysis. The main findings indicated that HTHA treatment could promote the hydration of mPWF and improve the mechanical properties of WPCs. Treatment temperature strongly affected the mechanical properties and moisture adsorption characteristics of the prepared composites. With the increase of treated temperature and feed rate, the number of hydroxyl groups, holocellulose content, and the pH of mPWF decreased. The degree of crystallinity and thermal stability and the storage modulus of the prepared composites of mPWF increased. However, dimensional stability and water absorption of WPCs significantly reduced. The best mechanical properties enhancement was observed with treatment temperature at 220 °C. This study demonstrated the feasibility for the application of an HTHA treatment in the WPC production industry. View Full-Text
Keywords: high-temperature hot air; modification mechanism; silane coupling agent; mechanical properties; interfacial compatibility; surface treatment; composite material high-temperature hot air; modification mechanism; silane coupling agent; mechanical properties; interfacial compatibility; surface treatment; composite material
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Chen, F.; Han, G.; Li, Q.; Gao, X.; Cheng, W. High-Temperature Hot Air/Silane Coupling Modification of Wood Fiber and Its Effect on Properties of Wood Fiber/HDPE Composites. Materials 2017, 10, 286.

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