Interaction of long‐lived reactive species from cold atmospheric pressure plasma with polymers: Role of macromolecular structure and deep modification of aromatic polymers
Interaction of long‐lived reactive species from cold atmospheric pressure plasma with polymers: Role of macromolecular structure and deep modification of aromatic polymers
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DOI：
10.1002/ppap.201900053
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发表时间：
2019-11
影响因子：
3.5
通讯作者：
P. Luan;G. Oehrlein
中科院分区：
文献类型：
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作者：
P. Luan;G. Oehrlein
我们报告（a）在大气压等离子体中产生的长寿命反应物种对聚合物的深度改性和（B）等离子体-聚合物相互作用对大分子结构的依赖性。基于苯乙烯的聚合物显示出显著的厚度膨胀，而具有甲基、醇和醚侧基的聚合物显示出低速率蚀刻。通过X射线光电子能谱和衰减全反射-傅里叶变换红外对聚苯乙烯（PS）的表征表明，等离子体处理破坏了芳环，产生了醚、酯和表面有机硝酸酯基团。这些变化可以发生在表面以下几十纳米处，我们将其归因于等离子体物种的反应扩散。比较三种苯乙烯基聚合物，即PS，聚（4-甲基苯乙烯）和聚（α-甲基苯乙烯），我们发现长寿命物种主要攻击芳环连接的碳位点上的C-H键。
We report (a) the deep modification of polymers by long‐lived reactive species generated in atmospheric pressure plasma and (b) the dependence of plasma–polymer interaction on the macromolecular structure. Styrene‐based polymers show significant thickness expansion whereas polymers with methyl, alcohol, and ether side groups show low‐rate etching. The characterization of polystyrene (PS) by X‐ray photoelectron spectroscopy and attenuated total reflectance–Fourier transform infrared shows that plasma treatment destroys aromatic rings and produces ether, ester, and surface organic nitrate groups. These modifications can happen at tens of nanometers below the surface, which we attribute to the reaction–diffusion of plasma species. Comparing three styrene‐based polymers namely PS, poly(4‐methyl styrene), and poly(α‐methyl styrene), we find that long‐lived species primarily attack the C–H bond on the carbon site where the aromatic ring connects.