酚醛树脂/木粉复合材料制备木材陶瓷结构变化过程研究

STUDY ON STRUCTURAL CHANGES DURING PREPARING WOODCERAMICS FROM PHENOLIC RESIN/BASSWOOD POWDER COMPOSITE

酚醛树脂/椴木木粉复合材料经高温真空碳化制成了木材陶瓷。利用XRD、SEM和FTIR技术对碳化温度和酚醛树脂/木粉质量比对木材陶瓷物相、微观结构和物理化学结构变化的影响进行了表征和研究。结果表明,木材陶瓷具有拓扑均匀的连通孔的三维网络结构,是含有CC、C—O—C和C—H等基团的类石墨结构的碳/碳复合材料;随碳化温度的升高,(002)峰强度增大,晶面间距d(002)降低,碳化木粉收缩,其间隙增大;酚醛树脂/木粉质量比增大,浸渍树脂的木粉成形能力改善,所得木材陶瓷结构更均匀,但其对木材陶瓷的XRD衍射花样影响不大。

A woodceramics was developed by carbonizing phenolic resin/basswood powder composite under vacuum at high temperatures. The effects of carbonization temperature and weight ratio of phenolic resin to wood powder on structural changes of woodceramics were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques. Experimental results show that woodceramics has a topologically uniform interconnected porous network microstructure, and is typical nongraphitizable carbon containing C=C bonds, C-O-C bonds and C-H structure. With increasing carbonization temperature, the (002) peak becomes stronger, the (002) interplanar spacing decreases, and the dimensions of carbonized wood powder decrease, while the space between carbonized wood powders increases. The increasing weight ratio of phenolic resin to wood powder improves the forming ability of phenolic resin impregnated wood powders, and results in a more uniform microstructure, but there is a slight effect on the XRD pattern of the resulting woodceramics.