荻草茎秆动态润湿性能及表面自由能  

Dynamic wettability and surface free energy of the Miscanthus sacchariflorus stalk

作　　者：廖承斌[1] 邓玉和[1] 王新洲[1] 范祥林[1] 杨莹[1] 陈民及 

机构地区：[1]南京林业大学木材工业学院,江苏南京210037

出　　处：《浙江农林大学学报》2014年第2期172-177,共6页Journal of Zhejiang A&F University

基　　金：国家自然科学基金资助项目(30871973);江苏省普通高校研究生科研创新工程项目(CXZZ11-0524);江苏高校优势学科建设工程资助项目

摘　　要：荻草Miscanthus sacchariflorus是一种高大直立的多年生高生物量草类。通过对荻草茎秆动态润湿模型、表面自由能的研究,探索荻草茎秆被胶黏剂胶合及作为人造板原材料的可能性。运用接触角测试仪,分别测定脲醛树脂(UF),三聚氰胺改性脲醛树脂(MUF)和酚醛树脂(PF)在荻草茎秆内、外表面的接触角,拟合出动态润湿模型。利用扩散渗透系数K,比较3种胶黏剂对荻草茎秆的润湿能力。运用表面张力仪测试荻草茎秆内、外表面自由能。结果表明:3种胶黏剂在荻草内、外表面的润湿模型,能很好地模拟接触角随时间变化的关系;3种胶黏剂在荻草茎秆表面的润湿性能为:三聚氰胺改性脲醛树脂<脲醛树脂<酚醛树脂;荻草茎秆的平均自由能约为47.49 mJ·m-2,与木材相近,高于麦秸。Silver grass （Miscanthus sacchariflorus ）, in the Poaceae family, is a tall, upright perennial grass with high biomass. To explore the feasibility of using adhesives to glue silver grass stalks and then utilizing them as a raw material for wood-based panels, dynamic wettability and surface free energy of silver grass stalks were determined. The adhesive contact angle on the silver grass stalks was measured to fit a model of dynamic wettability and compared using the diffuse-permeability coefficient K. The surface free energy of inter- nal and external surfaces of the silver grass stalks was also measured by a Surface Tensiometer. Results showed that the dynamic wettability model exactly simulated the effect of contact angle on time. Also, the wettability order of adhesives on silver grass stalk was melamine-urea-formaldehyde （MUF）〈urea-formaldehyde （UF）〈 phenol-formaldehyde （PF）, and the mean free energy of the silver grass stalk was 47.49 mJ·m-2, which was close to that of wood and higher than wheat straw. Silver grass can be glued by these three kind of adhesives for wood-based panels making.

关 键 词：生物质工程 荻草 胶黏剂 动态润湿模型 扩散渗透系数 表面自由能 

分 类 号：S781[农业科学—木材科学与技术] TS653[农业科学—林学]