材料期刊网

以杉木粉为原料、硼酚醛预聚体为前驱体,采用溶胶-凝胶法制备了硼酚醛/杉木粉复合材料。采用红外光谱、X射线衍射、扫描电镜、热失重等分析方法,研究了该复合材料的结构和相关性能。结果表明,木材中的羟基与硼酚醛预聚体上的羟基发生了缩合反应,形成了比较稳定的B-O-C键,木材纤维素的结晶被破坏,介观空隙消失;木粉用量的增加会导致复合材料缩合反应程度下降,木材纤维素结晶遭破坏程度降低。缩合反应生成的强化学键显著提高了复合材料的耐热性能,使失重10%时的热分解温度从270℃（木粉）提高到547℃。复合材料的吸水率远小于木材,而冲击强度、拉伸强度均呈现随木粉用量的增加先增大后降低的趋势。

Boron phenolics/wood composites were prepared by sol-gel method using boron phenolics prepolymer and powder of China fir as raw materials.The structure and properties of the composites were analyzed by Fourier transform infrared（FTIR） spectroscopy,X-ray diffractometry（XRD）,scanning electron microscopy（SEM） and thermogravimetric analysis（TGA）.The results show that the stable B-O-C bonds were formed by the reaction of the hydroxyl groups of the wood and the hydroxyl groups from boron phenolic prepolymer.XRD indicated that the crystalline phases of lignocellulose have been destroyed.And SEM revealed that the mesoscopic gaps in wood disappeared.The condensation degree and destruction degree of crystallinity of the composites decreased with increasing the amount of the wood powder.TGA shows that the composites have better thermostability.The characteristic degradation temperature at 10% mass loss increased evidently from 270℃ for pure wood powder to 547℃ for the composites.Water absorption of the composites was much less than that of wood.But the impact strength and the tensile strength of the composites increase firstly and then decrease with increasing the amount of wood powder.