Effect of electrode geometry on the uniformity of plasma-polymerized methyl methacrylate coatings
Effect of electrode geometry on the uniformity of plasma-polymerized methyl methacrylate coatings
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DOI：
10.1016/j.porgcoat.2010.11.009
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发表时间：
2011-04-01
影响因子：
6.6
通讯作者：
Payen, E.
中科院分区：
文献类型：
--
作者：
De Geyter, N.;Morent, R.;Payen, E.
等离子体聚合广泛用于存款功能化涂层，其性能可以通过不同的操作参数来调节。虽然等离子体沉积涂层有许多有趣的性能，这些参数对聚合过程的影响还没有很好地理解。在这项研究中，等离子体聚合的甲基丙烯酸甲酯（MMA）涂层的生产和精心策划的实验进行评估放电功率和电极的几何形状上的化学成分和沉积膜的厚度的影响。为了这个目的，聚合过程中进行的两个等离子体反应器具有不同的电极几何形状（平行板与网格板）和放电功率的影响进行检查两种反应器类型。该研究表明，沉积膜的化学组成受到放电功率的强烈影响：在高功率下，涂层含有较少的酯官能团，这很可能是由于在这些升高的功率下单体断裂。它还表明，在这项工作中，反应器设置强烈地决定了沉积膜的均匀性：在平行板反应器中，膜厚度，表面形态和化学成分取决于在放电区域中的基板的位置，而在网格到板反应器的沉积膜的物理和化学均匀。考虑到后一种说法，网对板反应器可能具有重要的工业应用。(C)2010 Elsevier BV保留所有权利。
Plasma polymerization is widely used to deposit functionalized coatings which properties can be tuned by different operational parameters. Although plasma-deposited coatings have many interesting properties, the influence of these parameters on the polymerization process is not yet well understood. In this study, plasma-polymerized methyl methacrylate (MMA) coatings are produced and carefully planned experiments are conducted to evaluate the influence of discharge power and electrode geometry on the chemical composition and thickness of the deposited films. For this purpose, polymerization processes are carried out in two plasma reactors with different electrode geometries (parallel plate versus mesh-to-plate) and the influence of discharge power is examined for both reactor types. This study reveals that the chemical composition of the deposited films is strongly influenced by the power of the discharge: at high powers, the coatings contain less ester functional groups, which is most likely due to monomer fragmentation at these elevated powers. It is also shown in this work that the reactor set-up strongly determines the uniformity of the deposited films: in the parallel plate reactor, film thickness, surface morphology and chemical composition depend on the location of the substrate in the discharge region, while in the mesh-to-plate reactor the deposited films are physically and chemically uniform. Taking into account the latter statement, the mesh-to-plate reactor might have important industrial applications. (C) 2010 Elsevier B.V. All rights reserved.