Effects of air-based nonequilibrium atmospheric pressure plasma jet treatment on characteristics of polypropylene film surfaces
Effects of air-based nonequilibrium atmospheric pressure plasma jet treatment on characteristics of polypropylene film surfaces
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DOI：
10.1016/j.apsusc.2019.144910
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发表时间：
2020-04-15
影响因子：
6.7
通讯作者：
Mukai, Takashi
中科院分区：
文献类型：
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作者：
Kawakami, Retsuo;Yoshitani, Yuki;Mukai, Takashi
使用由绞线圆柱形电极配置产生的基于空气的非平衡大气压等离子体射流处理聚丙烯（PP）薄膜表面。为了进行比较，PP 样品也使用 Ar 等离子射流进行处理。随着气体流速和喷嘴到样品距离的减小，空气等离子射流赋予聚合物表面的带电粒子通量大大增加，而 Ar 等离子射流的情况并非如此。减少气体流速和喷嘴到样品的距离大大提高了空气等离子体在 1 分钟的短时间内使表面亲水的程度。这种增强的效果被认为源自高浓度的氧基官能极性基团（FPG），其含有接枝到表面上的C-O/C-OH和C=O/C=O-OH键。该过程产生的亲水表面也表现出纳米孔结构。空气等离子体产生的大量氧基 FPG 主要归因于空气等离子体撞击表面的氧自由基离子。这还可以进一步归因于热诱导的氧化，而不是氧自由基的粘附和等离子体中紫外线诱导的氧化。纳米多孔结构也可归因于紫外光生空穴的氧化。
Polypropylene (PP) film surfaces were treated using air-based nonequilibrium atmospheric pressure plasma jets generated with a twisted wires-cylindrical electrode configuration. For comparison, PP samples were also processed with Ar plasma jets. The flux of charged particles imparted to the polymer surface by the air plasma jet greatly increased with decreases in both the gas flow rate and nozzle-to-sample distance, which was not the case for the Ar plasma jet. Reducing the gas flow rate and the nozzle-to-sample distance greatly enhanced the extent to which the surface was rendered hydrophilic by the air plasma within a short treatment time of 1 min. This enhanced effect is believed to originate from a high concentration of oxygen-based functional polar groups (FPGs) containing C-O/C-OH and C=O/C=O-OH bonds grafted onto the surface. The hydrophilic surfaces resulting from this process also exhibited nanopore structures. The large number of oxygen-based FPGs produced by the air plasma can be attributed primarily to oxygen radical ions impinging from the air plasma on the surface. This can further be attributed secondarily to heat-induced oxidation rather than the sticking of oxygen radicals and UV-induced oxidation from the plasma. The nanoporous structure can also be ascribed to oxidation from UV photogenerated holes.