杉木木材/蒙脱土纳米复合材料的结构和表征

该文预先合成水溶性酚醛树脂作为中间介质，通过加压浸渍处理制备了杉木木材/蒙脱土纳米复合材料(WMNC)，采用XRD、SEM、FTIR、TG-DTA等分析手段对WMNC的结构特性进行了表征.结果表明:①由于部分蒙脱土剥离片层进入了杉木木材细胞壁，WMNC中杉木木材的结晶度降低.②由于蒙脱土改性、树脂分子对蒙脱土的插层以及木材浸渍处理过程等的差异，蒙脱土在WMNC中的大小、形态和分布具多样性.蒙脱土填充的不均匀性，与杉木木材本身的渗透变异性相关.WMNC中的蒙脱土，部分填充于木材细胞腔等大孔隙，部分附着在木材细胞腔内壁，部分进入了细胞壁.③WMNC的缔合羟基增多，醚键大量增多，蒙脱土与杉木木材可能存在氢键或化学键结合.④WMNC的热分解历程改变，热性能提高，起始分解温度降低，高温区的热解失重显著减少，在一定程度上体现了无机复合组分蒙脱土纳米片层的纳米复合效应. 

Structure and characterization of Cunninghamia lanceolata wood-MMT inter-calation nanocomposite (WMNC)

With water-soluble phenol-formaldehyde resin as intermediate,Cunninghamia lanceolata wood_montmorillonite nanocomposite(WMNC) was prepared through vacuum impregnation and characterized with XRD,SEM,FTIR and TG--DTA analyses respectively.XRD analysis indicated that wood crystallinity of WMNC decreased,MMT exfoliates and some nano silicate layers entered into the non-crystallized microfibrillar region of wood cell wall.Wood structure and its impregnation are both anisotropic.Due to the nonuniformity of MMT organic modification,PF intercalation as well as wood impregnation, MMT configuration and distribution in wood are diverse.SEM graphs of WMNC show that some silicate grains block in wood cell lumen,some silicate layers adhere to the inner surface of wood cell wall, and some exfoliated MMT layers even penetrate into wood cell wall.The concluded hydroxyl bonding of WMNC increases and its ether bonding decreases.It is considered that MMT and wood interact with certain hydrogen binding and chemical linking.Compared with wood and PF-impreg,the pyrolysis process of WMNC changes;the starting decomposing temperature decreases and the pyrolysis weight loss at high temperature decreases greatly.WMNC indicates some nanoeffect of inorganic MMT nanolamellae.