Plasma treatment of polymers - Effects of energy transfer from an argon plasma on the surface chemistry of poly(styrene), low density poly(ethylene), poly(propylene) and poly(ethylene terephthalate)
Plasma treatment of polymers - Effects of energy transfer from an argon plasma on the surface chemistry of poly(styrene), low density poly(ethylene), poly(propylene) and poly(ethylene terephthalate)
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DOI：
10.1039/a702311a
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发表时间：
1997-09-07
期刊：
影响因子：
--
通讯作者：
Short, RD
中科院分区：
文献类型：
--
作者：
France, RM;Short, RD
经过Ar等离子体处理，然后暴露在大气中的氧气，已经被用来在聚合物表面引入新的碳氧功能。报道了聚苯乙烯(PS)、低密度聚乙烯(LDPE)、聚丙烯(PP)和聚对苯二甲酸乙二酯(PET)的处理方法。经过Ar等离子体处理的聚合物表面表现出“饱和”水平和“稳定”的氧掺入水平。前者是可以引入表面的最大氧气量。后者是氧掺入的最大水平，在该水平下，表面对聚合物非溶剂洗涤和随时间老化的稳定性都是稳定的。PS表现出最大的稳定氧结合水平，其次是LDPE和PP。PET显示几乎没有稳定的氧掺入。“稳定的”表面的特征是对(C)在BAR-O官能级下的高选择性(在O/C比=0.2时，PS的选择性为70%)。这些官能团中至少有40%通过化学衍生化被证明是羟基。用O_1S/O_2S比值突出了烃类聚合物在改性深度上的差异。我们认为，惰性气体等离子体处理通过能量传递过程赋予表面反应性。我们的结果基于公认的聚合物的交联链断裂机制而得到了合理的解释。
Argon plasma treatment followed by exposure to atmospheric oxygen has been used to introduce new carbon-oxygen functionalities to polymer surfaces. We report on the treatment of poly(styrene) (PS), low density poly(ethylene) (LDPE), poly(propylene) (PP) and poly(ethylene terephthalate) (PET). Argon plasma-treated polymer surfaces exhibit a 'saturation' level and a 'stable' level of oxygen incorporation. The former is the maximum amount of oxygen which can be introduced into the surface. The latter is the maximum level of oxygen incorporation at which the surface is stable to both washing with a polymer non-solvent, and ageing with time. PS exhibits the greatest level of stable oxygen incorporation followed by LDPE and PP. PET displays very little stable oxygen incorporation. 'Stable' surfaces are characterised by a high selectivity towards (C) under bar--O functionalities (> 70% for PS at O/C ratio = 0.2). At least 40% of these functionalities have been shown to be hydroxy groups through chemical derivatisation. The O 1s/O 2s ratio has been used to highlight differences in modification depths between the hydrocarbon polymers. We think that the inert gas plasma treatment imparts reactivity to a surface through an energy transfer process. Our results are rationalised on the basis of the accepted mechanisms of cross-linking vs. chain scission for the polymers.