Abstract
ABSTRACT Effects of nanowollastonite (NW) adsorption on cellulose surface were studied on physical and mechanical properties of medium-density fiberboard (MDF) panels; properties were then compared with those of MDF panels without NW-content. The size range of NW was 30-110 nm. The interaction between NW and cellulose was investigated using density functional theory (DFT). Physical and mechanical tests were carried out in accordance with the Iranian National Standard ISIRI 9044 PB Type P2 (compatible with ASTM D1037-99) specifications. Results of DFT simulations showed strong adsorption of NW on cellulose surface. Moreover, mechanical properties demonstrated significant improvement. The improvement was attributed to the strong adsorption of NW on cellulose surface predicted by DFT, adding to the strength and integrity between wood fibers in NW-MDF panels. It was concluded that NW would improve mechanical properties in MDF panels as a wood-composite material, as well as being effective in improving its biological and thermal conductivity.
Highlights
Fast-growing species provide an opportunity to satisfy the increasing needs for wood and wood products (FERNANDEZ et al, 2014)
The bond between Ca in NW and hydroxyl groups in cellulose chains was most responsible for the strong adsorption of NW on cellulose surface
After 24 hours immersion in water, the hydrogen bond network on cellulose surface was dominated by bonds with the abundant and small water molecules, NW bonds were substituted by water bonds on cellulose surface
Summary
Fast-growing species provide an opportunity to satisfy the increasing needs for wood and wood products (FERNANDEZ et al, 2014) They are usually harvested very young and the stem diameter is not large. Heat-transferring property of metal nanoparticles (KHOJIER et al, 2012; SABER et al, 2013) suspended in liquid (DRELISH, 2013) were reported to both decrease hot press time and improve physical and mechanical properties in wood-composite panels. The present research project was done to theoretically study adsorption of NW on cellulose in wood fibers, and experimentally investigate its possible effects on physical and mechanical properties in MDF panels
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