碱性脱脂处理对马尾松单板表面特性的影响

对马尾松Pinus massoniana单板进行氢氧化钠碱液脱脂处理，借助电子自旋振动渡谱仪、扫描电镜和表面张力仪分析脱脂处理对马尾松单板表面特性因子的影响。结果表明：稀碱脱脂处理以后，马尾松单板的自由基峰强度降低，但是马尾松单板脱脂前后自由基浓度分别为17．6494和17．6728，几乎没有变化；脱脂前后马尾松单板表面形貌的变化发现，稀碱脱脂处理大大降低了木材的脂含量，但是会增大木材表面粗糙度；脱脂处理以后，马尾松单板表面接触角变小，表面自由能增加了8．63％。图5表2参11

Surface characteristics of an alkaline degreasing treatment on Pinus massoniana veneer

Wood surface characteristics are very complicated, which is very important for wood bonding. Therefore, after Pinus massoniana veneer alkali degreased, related research of surface characteristics were studied. The influence of NaOH alkaline degreasing treatment on Pinus massoniana veneer was studied. Surface characteristics, such as surface free radical concentration, surface shape, and surface free energy, all with and without the degreasing process, were analyzed. The surface characteristics factors, such as surface free radical concentration, surface shape, and surface free energy, before and after degreasing process, were in vestigated by Electron Spin Resonance Spectroscopy （ESR）, Scanning Electron Microscope （SEM）, and Scan- ning Tunneling Microscopy （STM）, respectively. The results showed that the free radicals＇ peak strength of Pinus massoniana veneer decreased after dilute alkali degreasing, but the concentration of free radicals had no change （17.649 4 and 17.672 8）. SEM of the surface shape revealed that the alkali degreasing treatment greatly in the wood, but it also reduced smoothness of the wood surface. In addition, the surface contact angle de- creased, and the surface free energy increased slightly （about 8.7%）. Based on the results, alkaline degreas- ing treatment on Pinus massoniana veneer impoved the wood bonding inefficiently [Ch, 5 fig. 2 tab. 11 ref.]