Effects of cold SF6 plasma treatment on a-C:H, polypropylene and polystyrene

Autor(es)

Manosso Amorim, Milena Kowalczuk ^[1] ; Rangel, Elidiane Cipriano ^[1] ; Landers, Richard ^[2] ; Durrant, Steven F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, UNESP, Inst Ciencia & Tecnol Sorocaba, Lab Plasmas Tecnol, Ave Tres de Marco 511, BR-18087180 Sorocaba, SP - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Grp Fis Superficies, Inst Fis Gleb Wataghin, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SURFACE & COATINGS TECHNOLOGY; v. 385, MAR 15 2020.
• Citações Web of Science: 0

Resumo

The effects of cold SF6 plasma treatment on amorphous hydrogenated carbon (FA), polypropylene (PP) and polystyrene (PS) were investigated as functions of gas pressure and applied power. An anticipated increase in hydrophobicity was confirmed by the greater water contact angles, theta, observed after all the treatments. Under the best conditions theta was increased by 50.8 degrees, 57.2 degrees and 21 degrees, respectively. A rise and fall in. was observed as the pressure of SF6 was increased, this trend being most consistent for FA. Although the plasma treatments caused some changes in surface roughness, measured using profilometry, there were no clear correlations between this parameter and.. As revealed by Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Photoelectron Spectroscopy (XPS), the treated surfaces were fluorinated. As the degree of fluorination under optimal conditions was 2.2 at.%, 10.4 at.% and 36.3 at.% for the FA, PP and PS, respectively, this factor was not alone responsible for the observed increases in.. Sulfur was attached to the surface of all the treated samples. The relative surface carbon content was reduced by the treatments. The main causes of the changes in theta upon treatment were the induced compositional and structural changes. Ageing for ten days caused a typical decrease in theta of similar to 10 degrees, probably caused by rotation of hydrophobic surface groups into the surface. (AU)

• Processo FAPESP: 17/15853-0 - Caracterização de Filmes Finos Complexos Obtidos por PECVD e a Deposição de Filmes Finos em Substratos Porosos
• Beneficiário: Steven Frederick Durrant
• Modalidade de apoio: Auxílio à Pesquisa - Regular