Different Radial Modification Profiles Observed on APPJ-Treated Polypropylene Surfaces according to the Distance between Plasma Outlet and Target

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dc.contributor.authorNascimento, Fellype do [UNESP]
dc.contributor.authorLeal, Bruno Silva [UNESP]
dc.contributor.authorQuade, Antje
dc.contributor.authorKostov, Konstantin Georgiev [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionLeibniz Institute for Plasma Science and Technology—INP
dc.date.accessioned2023-07-29T15:14:25Z
dc.date.available2023-07-29T15:14:25Z
dc.date.issued2022-11-01
dc.description.abstractThe plasma jet transfer technique relies on a conductive wire at floating potential, which, upon entering in contact with a primary discharge, is capable of igniting a small plasma plume at the distal end of a long flexible plastic tube. In this work, two different long tube configurations were employed for the surface modification of polypropylene (PP) samples using argon as the working gas. One of the jet configurations has a thin copper (Cu) wire, which was installed inside the long tube. In the other configuration, the floating electrode is a metallic mesh placed between two plastic tubes in a coaxial arrangement. In the first case, the tip of the Cu wire is in direct contact with the working gas at the plasma outlet, whereas, in the second, the inner plastic tube provides an additional dielectric barrier that prevents the conductor from being in contact with the gas. Water contact angle (WCA) measurements on treated PP samples revealed that different surface modification radial profiles are formed when the distance (d) between the plasma outlet and target is changed. Moreover, it was found that the highest WCA reduction does not always occur at the point where the plasma impinges the surface of the material, especially when the d value is small. Through X-ray photoelectron spectroscopy (XPS) analysis, it was confirmed that the WCA values are directly linked to the oxygen-functional groups formed on the PP surfaces after the plasma treatment. An analysis of the WCA measurements along the surface, as well as their temporal evolution, together with the XPS data, suggest that, when the treatment is performed at small d values, the plasma jet removes some functional groups at the point where the plasma hits the surface, thus leading to peculiar WCA profiles.en
dc.description.affiliationFaculty of Engineering in Guaratinguetá São Paulo State University—UNESP
dc.description.affiliationLeibniz Institute for Plasma Science and Technology—INP
dc.description.affiliationUnespFaculty of Engineering in Guaratinguetá São Paulo State University—UNESP
dc.identifierhttp://dx.doi.org/10.3390/polym14214524
dc.identifier.citationPolymers, v. 14, n. 21, 2022.
dc.identifier.doi10.3390/polym14214524
dc.identifier.issn2073-4360
dc.identifier.scopus2-s2.0-85141877027
dc.identifier.urihttp://hdl.handle.net/11449/249378
dc.language.isoeng
dc.relation.ispartofPolymers
dc.sourceScopus
dc.subjectDBD plasma
dc.subjectplasma jets
dc.subjectplasma treatment
dc.subjectpolymer treatment
dc.subjecttransferred plasma
dc.titleDifferent Radial Modification Profiles Observed on APPJ-Treated Polypropylene Surfaces according to the Distance between Plasma Outlet and Targeten
dc.typeArtigo
unesp.author.orcid0000-0002-8641-9894[1]
unesp.author.orcid0000-0003-0524-2378[2]
unesp.author.orcid0000-0003-0814-4319[3]
unesp.author.orcid0000-0002-9821-8088[4]
unesp.departmentFísica e Química - FEGpt

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Guaratinguetá - FEG - Faculdade de Engenharia e Ciências