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为探明SiO2对速生林杨木的增强效果,采用溶胶-凝胶法和浸渍硅溶胶法制备了SiO2/杨木复合材料。用SEM、XRD、FTIR、热重分析等研究了SiO2/杨木复合材料微观形貌、结构组成及热降解性能。实验结果表明:SiO2分布于杨木导管、木纤维以及木材细胞间隙之间,采用溶胶-凝胶法制得的复合材料两相结合更紧密细致,填充效果更好;SiO2/杨木复合材料的衍射峰强度和结晶度均呈现减小趋势,且采用溶胶-凝胶法制备的复合材料纤维素(100)晶面衍射强度和结晶度显著减小;SiO2的引入改变了木材的热性能,SiO2/杨木复合材料的热解温度从420℃降低至380℃,缩短了高温热解反应温度区间,促进炭化阶段进行,在一定程度上保护杨木基材。
In order to find out the enhancement effect of SiO2 on fast-growing poplar, SiO2 / poplar composites were prepared by sol-gel method and impregnated silica sol. The microstructure, structure and thermal degradation properties of SiO2 / poplar composites were investigated by SEM, XRD, FTIR and TG. The experimental results show that SiO2 is distributed between the poplar wood, wood fiber and the intercellular space of the wood. The composite prepared by the sol-gel method is more compact and the filling effect is better. The diffraction of SiO2 / The intensity and crystallinity of the composites showed a decreasing trend, and the diffraction intensity and the crystallinity of the (100) crystal plane of the composite prepared by the sol-gel method were significantly reduced; the introduction of SiO2 changed the thermal properties of the wood, the SiO2 / The pyrolysis temperature of poplar wood composites decreased from 420 ℃ to 380 ℃, shortening the temperature pyrolysis reaction temperature range and promoting the carbonization stage, to a certain extent, to protect the poplar wood substrate.