ABSTRACT

Plasma treatment of mulberry silk fabric was carried out in an indigenously developed plasma reactor in the mixture of helium (He) and commercial fluorocarbon gas at atmospheric pressure. Optical emission spectra (OES) showed the appearance of major atomic lines of helium at 705 nm, 666 nm, 654 nm, 585 nm, and 726 nm. When fluorocarbon gas was introduced into the plasma zone along with helium, it got fragmented and showed atomic lines of fluorine (F) at 429 nm, 357 nm, 341 nm, 325 nm, and for –CF₂ at 318 nm. After He-fluorocarbon plasma treatment, hydrophilic silk fabric turned into hydrophobic. Different important plasma process parameters, i.e. treatment time, helium gas flow and fluorocarbon gas flow were optimized using Box Behnken Design using Design Expert 6.0 software. Scanning electron microscope surface morphology exhibits the deposition of fluorocarbon polymer on the fiber surface without blocking the inter-fiber spacing. Hydrophobic characteristic of plasma-treated samples was evaluated by measuring water absorbency time and contact angle value. The sample could retain the imparted hydrophobic finish till 10 repeated washing cycles.

摘要

桑蚕丝织物的等离子体处理是在一个本土开发的等离子体反应器中在氦 (He) 和商业碳氟化合物气体的混合物中在大气压下进行的。发射光谱 (OES) 显示在 705 nm、666 nm、654 nm、585 nm 和 726 nm 处出现了主要的氦原子线。当碳氟化合物气体与氦气一起被引入等离子体区时，它会破碎并在 429 nm、357 nm、341 nm、325 nm 和 -CF _{2处显示出氟 (F) 的原子线}在 318 纳米。经He-氟碳等离子体处理后，亲水性丝织物变为疏水性。不同的重要等离子体工艺参数，即处理时间、氦气流量和碳氟化合物气体流量，通过使用 Design Expert 6.0 软件的 Box Behnken Design 进行了优化。扫描电子显微镜表面形态显示碳氟聚合物在纤维表面上的沉积，而不会阻塞纤维间的间距。通过测量吸水时间和接触角值来评估等离子体处理样品的疏水特性。样品在 10 次重复洗涤循环之前可以保持赋予的疏水性。