羊毛表面改性对拒水拒油整理的作用及机理研究

应用扫描电镜(SEM)、X射线光电子能谱(XPS)和衰减全反射红外光谱(FTIR-ATR)等现代表面分析技术研究不同改性处理羊毛表面的化学和物理结构特性.SEM研究结果表明,经低温等离子体表面改性或特定化学改性后的羊毛鳞片表面呈现纳米尺度的沟槽和凹凸结构,应用Wenzel公式和Cassie and Baxter公式阐述了表面粗糙度与接触角的关系,揭示了羊毛表面改性对于提高拒水拒油整理效果的原因所在.XPS和FTIR-ATR研究表明,上述物理和化学的表面改性技术使羊毛表面的二硫键氧化断裂和表面类脂物质改性/除去,促进拒水拒油整理剂的吸附和固着.表面改性和拒水拒油整理的协同效应赋予羊毛类荷叶效应,使其呈现超级拒水拒油拒污功能.

EFFECT OF WOOL SURFACE MODIFICATION ON WATER REPELLENT AND OIL REPELLENT FINISHINGS

Scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy in attenuated total internal reflectance mode(FTIR-ATR) were employed to probe the surface chemical and physical structure natures of the surface modified wool.The SEM analysis shows the nano-size roughness on the plasma treated or chemical surface modified wool scales.Wenzel equation and Cassie and Baxter equation are used to illustrate the relationship between surface roughness and contact angle,then to reveal the reasons why surface modifications are able to impart an improved water repellence and oil repellence and stain resistance to wool.The XPS and FTIR-ATR analyses indicate the surface disulfide bonds scission and surface lipid modification/removal on the surface modified wool.The wool surface chemical changes are beneficial for water/oil repellent agent to absorb and fix on wool fibers.The synergistic effect between surface modification and water/oil repellent finishing imparts a lotus-like effect to wool,resulting in super water repellence and oil repellence functions of wool.