全氟正己烷等离子体对2种木材表面的疏水改性研究

Hydrophobic Modification of Two Kinds of Wood Surfaces via Perfluorohexane Plasma Treatment

采用全氟正己烷为等离子体源对思茅松和西南桦木材表面进行不同时间的聚合处理,借助接触角测量仪、X射线光电子能谱仪(XPS)和扫描电子显微镜(SEM)对处理前后木材表面的润湿性、元素组成及化学状态、表面形貌进行分析和表征。结果表明:2种木材表面的接触角均随处理时间的延长呈现先增加后略微减小的趋势,当处理9 min时2种木材表面的接触角均达最大值,思茅松早材、晚材和西南桦的最大接触角分别为130.1°、131.2°、135.5°;处理9 min时,思茅松和西南桦木材表面的F元素含量分别为33.92%、24.73%,主要由C-C、C-CFn、CF、CF2和CF3基团组成;处理后的思茅松木材细胞壁表面形成了不规则粗糙结构,而西南桦木材细胞壁表面则形成了类似麻花状的粗糙结构。

The wood surfaces of Pinus kesiya and Betula alnoides were modified at different times using perfluorohexane plasma polymerization. The wettability of the wood surfaces before and after modification, element composition and their chemical bonding information, and surface morphology were measured and analyzed by contact angle measurement, Xray photoelectron spectroscopy （XPS）, and scanning electron microscopy （SEM）. The results showed that the water contact angle of both two kinds of wood surfaces first increased and then decreased slightly with the increase of treatment time, and reached a maximum of water contact angle value with 9 min treatment. The water contact angle value of early wood and late wood of Pinus kesiya and Betula alnoides is 1301°, 1312° and 1355°, respectively. When treatment time was 9min, the wood surfaces F content for Pinus kesiya and Betula alnoides were 3392% and 2473%, respectively. Furthermore, the functional groups of the polymerization polymer films were mainly composed of CC, CCFn, CF, CF2 and CF3. After plasma polymerized perfluorohexane was applied to wood surfaces, irregular structure formed on the cell wall surface of Pinus kesiya, whereas a twistslike structure formed on Betula alnoides.