Hydrophobic recovery of plasma-treated polydimethylsiloxane
Hydrophobic recovery of plasma-treated polydimethylsiloxane
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DOI：
10.1080/00218469508014379
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发表时间：
1995-01-01
影响因子：
2.2
通讯作者：
Owen, MJ
中科院分区：
文献类型：
--
作者：
Fritz, JL;Owen, MJ
等离子体处理有机硅表面是一种有用的，环保的方法，增加润湿性，提高附着力。用各种等离子体气体，如氩、氦、氧和氮，产生一层薄的、可湿的类似二氧化硅的层。然而，在每种情况下，表面逐渐恢复其疏水性。在更严重的等离子体处理水平下，二氧化硅样层是脆的，微裂纹是明显的。开裂的发生是等离子体气体、射频功率、压力和处理时间的函数。用扫描电子显微镜对裂纹进行了表征。通过水接触角的变化监测疏水采收率。它发生在有裂纹和未裂纹的处理表面。在开裂开始时，疏水性有一个最初的跳跃。此后，裂纹表面和未裂纹表面的恢复大致相当，在一周内几乎完全恢复了原始疏水性。这些影响可以通过低分子量材料从新裂缝中快速表面扩散，然后通过聚合物基体缓慢扩散来解释。不同等离子体气体的回收率也有显著差异。
Plasma treatment of silicone surfaces is a useful, environmentally-sound method of increasing wettability to improve adhesion. A thin, wettable silica-like layer is produced with various plasma gases such as argon, helium, oxygen and nitrogen. However, in each case the surfaces gradually recover their hydrophobicity. The silica-like layer is brittle and microcracking is evident at more severe levels of plasma treatment. The onset of cracking is a function of plasma gas, RF power, pressure and treatment time. Scanning electron microscopy has been used to characterize the cracks.The hydrophobic recovery has been monitored by water contact angle changes. It occurs with both cracked and uncracked treated surfaces. There is an initial jump in hydrophobicity at the onset of cracking. Thereafter, the recovery of both cracked and uncracked surfaces broadly parallels each other with virtually complete recovery of original hydrophobicity within one week. These effects can be accounted for by rapid surface diffusion of low molecular weight material out of fresh cracks followed by slower bulk diffusion through the polymer matrix. Significant differences in recovery rates are also evident between different plasma gases.