SiO2 / 杉木粉复合材料的制备和表征

以人工林杉木粉为原料和正硅酸乙酯( TEOS) 为无机前驱体, 依据溶剂热法反应原理, 采用溶胶凝胶的方法制备了SiO₂ / 木材复合材料。通过红外光谱分析( FTIR) 、X射线衍射分析(XRD) 、热失重分析( TGA) 、扫描电子显微镜分析(SEM) 等方法, 研究了该复合材料的结构和性能。研究结果表明, 使用这种方法, 木材的增重率显著提高。木材中的羟基与正硅酸乙酯水解后的羟基发生了缩合反应, 体系中存在Si —O —C 交联网络, 微观上形成了纳米网络结构。木质纤维素的结晶被破坏, 结晶度从75. 37 %(纯木粉) 下降到37. 42 %(木材增重率为78 %的复合体系) 。交联网络的形成显著提高了该材料的耐热性能, 使失重10 %时的热分解温度从270 ℃(纯木粉) 提高到409 ℃。 

Preparation and characterization of SiO2 / wood hybrid materials

SiO2 / wood hybrid materials were prepared by the method of sol gel using TEOS as inorganic mediumand china fir as raw materials , according to the principle of solvothermal method. The st ructure and property of thehybrid materials were analyzed by FTIR , XRD , TGA and SEM. The result s show that the WPG (weight percentgain) of the wood get s a marked improvement and the hydroxyl groups f rom the hydrolysis of TEOS reacted withthe hydroxyl groups of the wood. In SEM analysis , the network whose size is in nanoscale is found , which resultedf rom the coagulation of Si —O —C network. And in XRD analysis , the crystalline phase of lignocellulose has beendest royed. Meanwhile , the crystallinity decreases from 75. 37 % for pure wood powder to 32. 42 % for 78 % WPGhybrid material. TGA shows that the hybrid materials has a better thermostability. The characteristic degradationtemperature at 10 % mass loss is evidently increased from 270 ℃for pure wood powder to 409 ℃for 78 % WPGhybrid materials.