Greene George, Yao George, Tannenbaum Rina
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, and Porex Corporation, 500 Bohannon Road, Fairburn, Georgia 30213.
Langmuir. 2003 Jul 8;19(14):5869-5874. doi: 10.1021/la026940+.
This paper examines the wetting characteristics of porous polyethylene surfaces modified by exposure to reactive oxygen glow discharge gas plasma, through the direct measurement of the wicking properties of the modified material. It is well-known that oxygen plasma can be used to chemically alter the surface of polyethylene to enhance wetting properties. Chemical and physical modification of a polymer's surface is the consequence of reactions initiated by the collision of high-energy species in the plasma with the polymer surface. The conditions of the plasma treatment, such as electric field strength (power), exposure time, and chamber pressure, govern the frequency and energy of collisions and, thus, determine the nature and degree of the chemical modification of the polyethylene surface. Comparisons of the chemical modification of sintered porous polyethylene surfaces achieved through treatments with reactive oxygen glow discharge gas plasmas generated at various powers, chamber pressures, and times of exposure were made by measuring the wicking rate of distilled and deionized water in the modified materials. A strong correlation was observed between the electric field power used to generate the plasma and the degree of chemical modification of the polyethylene surfaces. In addition, the rate of chemical modification was also found to be a function of the electric field power.
本文通过直接测量改性材料的芯吸性能，研究了暴露于活性氧辉光放电气体等离子体下改性的多孔聚乙烯表面的润湿特性。众所周知，氧等离子体可用于化学改变聚乙烯表面，以增强润湿性能。聚合物表面的化学和物理改性是等离子体中高能物种与聚合物表面碰撞引发的反应的结果。等离子体处理条件，如电场强度（功率）、暴露时间和腔室压力，控制着碰撞的频率和能量，从而决定了聚乙烯表面化学改性的性质和程度。通过测量改性材料中蒸馏水和去离子水的芯吸速率，对在不同功率、腔室压力和暴露时间下产生的活性氧辉光放电气体等离子体处理烧结多孔聚乙烯表面的化学改性进行了比较。观察到用于产生等离子体的电场功率与聚乙烯表面的化学改性程度之间存在很强的相关性。此外，还发现化学改性速率也是电场功率的函数。
