Transparent wood and method for its preparation
A wood, transparent technology, applied in wood treatment, wood impregnation, wood impregnation, etc., can solve the problems of not necessarily environmental protection, time-consuming and so on
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Embodiment 1
[0053] lignin-preserving bleaching
[0054] Dimensions 20mm x 20mm, thickness 1mm (radial thickness) and density 160kg / m 3 The balsa wood pieces (Ochroma pyramidale, purchased from Wentzels Co. Ltd, Sweden) were dried at 105±3°C for 24h. A bleach solution was prepared by mixing the chemicals in the following order: deionized water, sodium silicate (3.0 wt%) (Fisher Scientific UK), sodium hydroxide solution (3.0 wt%) (Sigma-Aldrich), magnesium sulfate (0.1 wt%) %) (Scharlau), DTPA (0.1 wt%) (Acros Organics) and then H 2 o 2 (4.0 wt%) (Sigma-Aldrich), where all weight percents are based on the weight of water in the bleach liquor. Bleached wood substrates were obtained by dipping 10 balsa wood pieces in 200 mL (excess) of bleaching solution at 70° C. until the wood turned white, which took about 2 hours. The bleached wood substrates were rinsed thoroughly with deionized water and kept in water until further use.
Embodiment 2
[0055] Embodiment 2 (comparison)
[0056] Sodium hypochlorite delignification
[0057] Dimensions 20mm x 20mm, thickness 1mm (radial thickness) and density 160kg / m prior to chemical extraction 3 The balsa wood substrate (Ochroma pyramidale, purchased from Wentzels Co. Ltd, Sweden) was dried at 105±3° C. for 24 h. At 80°C, use 400-500 mL of 1 wt% sodium hypochlorite (NaClO) in acetate buffer solution (pH 4.6) 2 , Sigma-Aldrich) (in excess) to delignify the dried substrate. The reaction was stopped when the wood turned white, which took 6 hours. The delignified substrates were carefully washed with deionized water and kept in water until further use.
Embodiment 3
[0059] Transparent Wood Preparation
[0060] The wood substrates obtained in Examples 1 and 2 were dehydrated before polymer impregnation by solvent exchange with ethanol and then acetone. Each solvent exchange step was repeated 3 times. First, methyl methacrylate (MMA) monomer (Sigma-Aldrich) was pre-polymerized at 75°C for 15 minutes, using 0.3 wt% (based on MMA monomer) of 2,2′-azobis(2-methylpropane Nitrile) (AIBN) (Sigma-Aldrich) was used as the initiator and cooled to room temperature. Subsequently, the delignified or bleached wood substrates from Examples 1 and 2 were fully vacuum impregnated in the prepolymerized PMMA solution for several hours. Finally, the impregnated wood substrate was sandwiched between two glass slides, wrapped in aluminum foil, and subsequently cured in an oven at 70 °C for 4 hours. PMMA reference samples without wood substrate were prepared from the same MMA monomer.
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