期刊
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
卷 31, 期 10, 页码 2012-2022出版社
SOC BRASILEIRA QUIMICA
DOI: 10.21577/0103-5053.20200101
关键词
roughness surface; scaling laws; non-thermal plasma; polymer surface
资金
- FEDER, through Programa Operacional Factores de Competitividade (COMPETE)
- Fundacao para a Ciencia e a Tecnologia (FCT) [UID/FIS/00068/2013]
- CNPq
- CAPES/PRINTUFSC
- Fundação para a Ciência e a Tecnologia [UID/FIS/00068/2013] Funding Source: FCT
Processes such as ablation, erosion and corrosion generally create roughness patterns on solid surfaces. Despite the randomness of this phenomenon, some patterns can be described mathematically by studying statistically the mechanisms behind them. This paper reports an experimental study on the temporal evolution of the roughness development of polymer surfaces exposed to argon non-thermal plasma under reduced pressure of 5 mbar and 65 W of applied power. The substrates studied were polypropylene, high density polyethylene, polyamide-6 and poly(ether ether)ketone. The mean roughness data as well as the saturation roughness values showed differences between polyolefin and polymers containing heteroatoms and notably the dependence of the etching on the packing density of the polymer chains. The plasma-etched surfaces were described statistically as self-affine surfaces using scaling law analysis, exhibiting roughness exponents of alpha ca.0.73 +/- 0.2 and growth exponents of beta ca. 1.0 +/- 0.1. The roughness increases and decreases successively during treatment although presenting a general linear behavior in a non-monotonous way, as a function of time. The models for the shadowing and redistribution of active species can be complemented with the transient crosslinking model of the observed flattening stages.
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