| Artificial fast-growing forest poplar has natural defects such as opacity,softness and low density.Glass is fragile and easy to produce light pollution.In view of the above problems,this thesis proposes transparent opaque wood.Transparent opaque wood can not only provide sufficient indoor light,but also ensure indoor privacy,so as to apply it to indoor building materials.Therefore,in this experiment,poplar wood was used as the substrate,and delignification and chromophore removal were carried out respectively to prepare the matrix template material,which was then filled with methyl methacrylate and titanium dioxide,and further modified by coupling agent to obtain transparent opaque wood.Finally,the structure of the samples was characterized by FTIR,EDX and XRD.The optical,mechanical and environmental properties of the samples were tested by ultraviolet spectrophotometer,electronic experimental machine and nanoindentation instrument.The main contents are as follows :(1)The matrix template was characterized by lignin content,pore size,gas permeability coefficient,SEM and FTIR.The results show that the pore size,specific surface area,gas permeability coefficient and saturated wet expansion rate of the two matrix templates are improved compared with the materials.The results of lignin content showed that the matrix template retained 14.62 % and 19.89 % lignin content.SEM and FTIR results showed that the matrix template retained the microstructure of wood pores and removed some lignin.The pore structure of the two matrix templates has been improved,which is conducive to the filling of subsequent polymers.(2)SEM,FTIR,EDX,XRD structural characterization,optical and mechanical properties of two kinds of transparent opaque wood were tested.In SEM and EDX spectra,PMMA / Ti O2 did penetrate into the wood,and the characteristic diffraction peaks of PMMA / Ti O2 were observed in XRD and FTIR spectra.The optical performance results show that the highest transmittance is 41 % and 43 %,and the haze is nearly 100 %.The results of mechanical properties showed that the tensile properties of delignification transparent opaque wood and dechromed transparent opaque wood were 4.6MPa and 4.9 MPa.Delignification transparent opaque wood and dechromed transparent opaque wood also have excellent hardness and elastic modulus.(3)The FTIR,optical and mechanical properties of the coupling agent modified transparent opaque wood were characterized.The FTIR analysis showed that the coupling agent had been immersed into the wood.The transmittance of delignification transparent opaque wood modified by coupling agent was 47.23 %.The translucent opaque wood modified by coupling agent has the highest transmittance of 44.50 %.The maximum tensile strength of the two coupling agent modified wood is 7.50 MPa and 6.37 MPa.The hardness of the delignification coupling agent modified material is 0.25 GPa,and the elastic modulus is 7.42 GPa.The hardness of the dechromophore coupling agent modified material is 0.20 GPa,and the elastic modulus is 8.93 GPa.The above results show that the optical and mechanical properties of the coupling agent modified wood are higher than those of the unmodified wood.(4)The water contact angle,acid-base contact angle,self-cleaning and UV resistance of the coupling agent modified transparent opaque wood were tested.The water contact angle of delignification coupling agent modified wood was 79.3 °,and the water contact angle of dechromophore coupling agent modified wood was 89.7 °.The highest contact angle of the delignification coupling agent modified wood under acidic conditions was 87.8 °,and the highest contact angle under alkaline conditions was 80 °.The highest contact angle of the dechromophore coupling agent modified wood under acidic conditions was 84 °,and the highest contact angle under alkaline conditions was 86 °.The coupling agent modified wood has good self-cleaning property and good ultraviolet resistance to solid-liquid pollutants. |
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