A Quartz Crystal Microbalance Simulation to Examine the Effect of Ultraviolet Light Treatment on Characteristics of Polyethylene Surface
A Quartz Crystal Microbalance Simulation to Examine the Effect of Ultraviolet Light Treatment on Characteristics of Polyethylene Surface
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DOI：
10.5650/jos.57.495
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发表时间：
2008-09-01
影响因子：
1.5
通讯作者：
Tabata, Izumi
中科院分区：
文献类型：
--
作者：
Gotoh, Keiko;Tagawa, Yumiko;Tabata, Izumi
采用石英晶体微天平（QCM）技术研究了紫外光照射对聚乙烯（PE）表面特性的影响。通过旋涂溶液在 QCM 的金电极上制备 PE 膜，然后在环境空气中用准分子紫外灯进行处理。由QCM的频率变化确定由于UV照射而引起的PE膜的亲水性、吸湿性和保水性的变化。为了评估PE膜的去污力，将硬脂酸作为模型油污沉积到通过Langmuir-Blodgett (LB)技术形成在QCM上的PE膜上，并在含有乙醇或表面活性剂的洗涤剂水溶液中进行超声波清洗。发现从 QCM 频率变化获得的去除效率在 UV 照射后显着增加。根据独立测定的接触角和 PE 薄膜的表面自由能分量，计算出接触区域中硬脂酸和 PE 之间清洁剂溶液渗透所导致的自由能变化。去除效率和自由能变化之间存在良好的关系，表明紫外线照射对 PE 表面去污力的增加可以通过表面能量来解释。
The effect of ultraviolet light irradiation on the characteristics of the polyethylene (PE) surface was investigated by the quartz crystal microbalance (QCM) technique. The PE film was prepared on the gold electrodes of the QCM by spin-coating from the solution and then was treated by the excimer UV lamp in ambient air. The changes in the hydrophilic properties, moisture adsorption, and water retention of the PE film due to the UV irradiation were determined from the frequency change of the QCM. To evaluate the detergency of the PE film, stearic acid as model oily soil was deposited onto the PE film formed on the QCM by the Langmuir-Blodgett (LB) technique, and was ultrasonically cleaned in aqueous detergent solutions containing ethanol or surfactant. The removal efficiency obtained from the frequency change of the QCM was found to increase considerably after the UV irradiation. From independently determined contact angles and the surface free energy components of the PE film, the free energy change resulting from the penetration of the detergent solution between stearic acid and PE in the zone of contact was calculated. Good relation was found between the removal efficiency and the free energy change, indicating that the increase in the detergency of the PE surface by UV irradiation was explained by surface energetics.