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首页> 外文期刊>Applied Surface Science >Treatment of PVC using an alternative low energy ion bombardment procedure
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Treatment of PVC using an alternative low energy ion bombardment procedure

机译：使用替代的低能离子轰击程序处理PVC

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摘要

In many applications, polymers have progressively substituted traditional materials such as ceramics, glasses, and metals. Nevertheless, the use of polymeric materials is still limited by their surface properties. Frequently, selective modifications are necessary to suit the surface to a given application. Amongst the most common treatments, plasma immersion ion implantation (PHI) has attracted the attention of many researchers owing to its versatility and practicality. This method, however, requires a power supply to provide high voltage (tens of kV) negative pulses, with a controlled duty cycle, width and frequency. Owing to this, the implementation of PHI on the industrial scale can become economically inviable. In this work, an alternative plasma treatment that enables low energy ion bombardment without the need of a high voltage pulse generator is presented. To evaluate the efficiency of the treatment of polymers, polyvinylchloride, PVC, specimens were exposed to 5 Pa argon plasmas for 3600 s, at excitation powers, P, of between 10 and 125 W. Through contact angle and atomic force microscopy data, the influence of P on the wettability, surface free energy and roughness of the samples was studied. Surface chemical composition was measured by X-ray photoelectron spectroscopy, XPS. To evaluate the effect of aging under atmospheric conditions, contact angle and XPS measurements were performed one and 1334 days after the treatment. The plasma potential and ion density around the driven electrode were determined from Langmuir probe measurements while the self-bias potential was derived with the aid of an oscilloscope. From these data it was possible to estimate the mean energy of ions bombarding the PVC surface. Chlorine, carbon and oxygen contamination were detected on the surface of the as-received PVC. Upon exposure to the plasma, the proportion of chlorine was observed to decrease while that of oxygen increased. Consequently, the wettability and surface energy increased after the treatment but such modifications were not stable after aging: the contact angle increased for all the samples, modifying the initially hydrophilic surface into a highly hydrophobic one. Consistently, the surface composition also changed after aging: there was carbon enrichment due to further losses of oxygen and chlorine. Another relevant factor for the elevation of 9 was the change in morphology induced by the treatment. At greater powers, the uniform matrix of the PVC was transformed into a columnar structure containing randomly distributed sharp pillars. Interpretation of such results is proposed in terms of the total energy deposited in the solid by ionic collisions.
机译：在许多应用中，聚合物已逐渐取代了传统材料，例如陶瓷，玻璃和金属。然而，聚合物材料的使用仍然受到其表面性质的限制。通常，必须进行选择性修改才能使表面适合给定的应用。在最常见的治疗方法中，等离子体浸没离子注入（PHI）由于其多功能性和实用性而吸引了许多研究人员的注意。但是，该方法需要电源提供具有受控占空比，宽度和频率的高压（数十kV）负脉冲。因此，在工业规模上实施PHI可能在经济上变得不可行。在这项工作中，提出了一种替代的等离子体处理方法，该方法可以进行低能离子轰击而无需高压脉冲发生器。为了评估聚合物，聚氯乙烯，聚氯乙烯的处理效率，将样品在5 Pa氩气等离子体中以10至125 W的激发功率P暴露3600 s。通过接触角和原子力显微镜数据，可以得出影响磷对样品的润湿性，表面自由能和粗糙度的影响。表面化学组成通过X射线光电子能谱，XPS测量。为了评估在大气条件下老化的影响，在处理后的1天和1334天进行了接触角和XPS测量。根据Langmuir探针测量来确定驱动电极周围的等离子体电势和离子密度，同时借助示波器得出自偏置电势。从这些数据可以估计离子轰击PVC表面的平均能量。在收到的PVC表面检测到氯，碳和氧污染。当暴露于等离子体中时，观察到氯的比例减少而氧气的比例增加。因此，处理后的润湿性和表面能增加，但是这种改性在老化后不稳定：所有样品的接触角均增加，将最初的亲水性表面改性为高度疏水性的表面。一致的是，表面成分在老化后也发生了变化：由于氧气和氯气的进一步损失，碳富集了。升高9的另一个相关因素是治疗引起的形态变化。在更大的功率下，PVC的均匀基质转变为包含随机分布的尖锐柱状物的柱状结构。根据离子碰撞在固体中沉积的总能量，提出了这种结果的解释。

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  • 来源
    《Applied Surface Science》 |2011年第5期|p.1854-1861|共8页
  • 作者

    Elidiane C. Rangel; Nazir M. dos Santos; Jose Roberto R. Bortoleto; Steven F. Durrant; Wido H. Schreiner; Roberto Y. Honda; Rita de Cassia C. Rangel; Nilson C. Cruz;

  • 作者单位

    Laboratdrio de Plasmas Tecnologicos, Universidade Estadual Paulista, Campus Experimental de Sorocaba, Av. Tres de Marfo, 511 Alto da Boa Vista, 18087-180, Sorocaba, SP, Brazil;

    Laboratdrio de Plasmas Tecnologicos, Universidade Estadual Paulista, Campus Experimental de Sorocaba, Av. Tres de Marfo, 511 Alto da Boa Vista, 18087-180, Sorocaba, SP, Brazil;

    Laboratdrio de Plasmas Tecnologicos, Universidade Estadual Paulista, Campus Experimental de Sorocaba, Av. Tres de Marfo, 511 Alto da Boa Vista, 18087-180, Sorocaba, SP, Brazil;

    Laboratdrio de Plasmas Tecnologicos, Universidade Estadual Paulista, Campus Experimental de Sorocaba, Av. Tres de Marfo, 511 Alto da Boa Vista, 18087-180, Sorocaba, SP, Brazil;

    Laboratorio de Interfaces e Filmes Finos, Universidade Federal de Parana (UFPR), CP. 19044, 81531-990, Curitiba, PR, Brazil;

    Laboratdrio de Plasmas, Universidade Estadual Paulista (UNESP), Departamento de Fisica e Quimica, 12516-410, Guaratingueta. SP, Brazil;

    Laboratdrio de Plasmas Tecnologicos, Universidade Estadual Paulista, Campus Experimental de Sorocaba, Av. Tres de Marfo, 511 Alto da Boa Vista, 18087-180, Sorocaba, SP, Brazil;

    Laboratdrio de Plasmas Tecnologicos, Universidade Estadual Paulista, Campus Experimental de Sorocaba, Av. Tres de Marfo, 511 Alto da Boa Vista, 18087-180, Sorocaba, SP, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    PVC; ion bombardment; plasma treatment; wettability; rouehness;

    机译：PVC;离子轰击等离子处理润湿性路由;

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