Use of aluminum oxide nanoparticles in wood composites to enhance the heat transfer during hot-pressing

Published Date

March 2013, Volume 71, Issue 2, pp 193-198

First online: 24 January 2013

Title 

Use of aluminum oxide nanoparticles in wood composites to enhance the heat transfer during hot-pressing

• 
  

• Author 

• Anuj Kumar
• , Arun Gupta 
• , K. V. Sharma
• , M. Nasir

• 
  

Abstract

In this study, the effect of Al2O3 nanoparticles on the heat-transfer properties of medium density fiberboard (MDF) was investigated. Al2O3 nanoparticles were added at two levels (0.5 and 1.0 %) by percentage weight fraction of dry wood fibers to urea formaldehyde (UF) resin. The core temperature profile and thermal conductivity tests showed higher rate of heat transfer after addition of nanoparticles, subsequently it has improved the bonding strength of MDF. Differential scanning calorimetry was used to estimate the heat evolved during the exothermic reaction of UF resin curing. Scanning electron microscopy shows good dispersion of nanoparticles. Thermal conductivity of UF resin improved after nanoparticles addition proved by KD2 pro results. Modulus of rupture, modulus of elasticity and thickness swelling also improved.

Verwendung von Aluminiumoxid-Nanopartikeln in Holzwerkstoffen zur Verbesserung des Wärmedurchgangs beim Heißpressen

Zusammenfassung

In dieser Studie wird der Einfluss von Al2O3 Nanopartikeln auf die Wärmedurchgangseigenschaften von mitteldichten Faserplatten (MDF) untersucht. Al2O3 Nanopartikel wurden in zwei unterschiedlichen Mengen (0,5 % und 1,0 %) bezogen auf das Spantrockengewicht zum Harnstoffharz zugegeben. Prüfungen der Kerntemperatur und der Wärmeleitfähigkeit ergaben eine höhere Wärmedurchgangsrate nach Zugabe von Nanopartikeln und eine Verbesserung der Klebfestigkeit von MDF. Mittels Differenzialrasterkalorimetrie wurde die während der exothermischen Reaktion bei der Härtung von Harnstoffharz abgegebene Wärme geschätzt. Rasterelektronenmikroskopie zeigte eine gute Verteilung der Nanopartikel. Messungen mit dem KD2 pro Gerät belegen, dass sich die Wärmeleitfähigkeit von Harnstoffharz nach Zugabe der Nanopartikel verbessert hat. Die Biegefestigkeit (MOR), der Elastizitätsmodul (MOE) und die Dickenquellung (TS) verbesserten sich ebenfalls.

References

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For further details log on website :

http://link.springer.com/article/10.1007/s00107-013-0664-9