MMT/PVA/木材复合材料的物理力学性能  

Physical and Mechanical Properties of MMT/PVA/Wood Composites

作　　者：姜卸宏[1] 曹金珍[1] 罗冠群[1] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083

出　　处：《林产化学与工业》2011年第1期41-46,共6页Chemistry and Industry of Forest Products

基　　金：人事部回国人员启动项目资助(无编号)

摘　　要：分别采用一步法和两步法制备聚乙烯醇(PVA)和有机蒙脱土(MMT)的复合处理液,复合处理液通过满细胞法真空加压浸注杉木试材,制备MMT/PVA/杉木材复合材料(PVDMW)。测定了PVDMW的吸水率、抗胀缩率(AS)、表面硬度、顺纹抗压强度和抗水流失性,同时采用红外光谱分析(FT-IR)对两种方法机理进行分析。研究结果表明:一步法复合材料(PVDMW-1)的AS和抗水流失性明显优于两步法复合材料(PVDMW-2),而吸水率和抗压强度两者无明显差异,表面硬度则是PVD-MW-2优于PVDMW-1;FT-IR结果表明:PVDMW-1在521和468 cm-1附近出现了表征蒙脱土中Si—O—M(金属阳离子)和M—O的耦合振动的吸收峰,表明PVDMW-1中蒙脱土进入了木材细胞壁内。Composite treating solutions from polyvinyl alcohol（（PVA） and organic montmorillonite（MMT） were prepared through one-step and two-step method respectively and used to impregnate Chinese fir（ Cunninghamia lanceolata）sapwood specimens by full-cell vacum-pressure process to produce MMT/PVA/wood composite（PVDMW）. The water adsorption, antishrinking efficien- cy（As）, surface hardness, compression strength parallel to grain and leaching resistance of composites prepared through two methods were determined. Fourier transform infrared spectroscopy （FT-IR）was used to analyze its mechanism of improving the properties of wood. The results showed that As and leaching resistance of PVDMW-1 prepared by one-step method were obviously higher than PVDMW-2 prepared by two-step method, while water absorption and compressive strength parallel to grain of both composites were similar, and the surface hardness of PVDMW-2 was higher than that of PVDMW-1. From FT-IR analysis, the characteristic peaks of MMT were observed in PVDMW-1. It suggested that MMT entered into the wood cell wall in the composite prepared by one-step method.

关 键 词：杉木 蒙脱土(MMT) 聚乙烯醇(PVA) 

分 类 号：TQ35[化学工程]