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Hemocompatibility properties of a polymer surface treated in plasma containing sulfur
Author(s) -
Vesel Alenka,
Zaplotnik Rok,
Modic Martina,
Mozetic Miran
Publication year - 2016
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5965
Subject(s) - sulfur , surface modification , x ray photoelectron spectroscopy , polymer , chemistry , oxygen , polyethylene terephthalate , deposition (geology) , contact angle , polyethylene , adhesion , polymer chemistry , chemical engineering , organic chemistry , materials science , composite material , paleontology , sediment , engineering , biology
Polymer polyethylene terephthalate was treated in plasmas containing sulfur to incorporate different sulfur functional groups and improve its hemocompatibility properties. Plasma was created either by SO 2 , H 2 S or an H 2 S/O 2 mixture. Sequential treatments in H 2 S and O 2 plasmas were also used. The surface of the treated samples was analyzed using X‐ray photoelectron spectroscopy, and surface hemocompatibility was tested by investigating platelet adhesion. While SO 2 plasma caused functionalization of the surface with –SO 3 and –SO 4 functional groups, H 2 S plasma caused functionalization with non‐oxidized –SH 2 sulfur groups, as well as sulfur deposition on the polymer surface. Addition of oxygen to the H 2 S gas caused a significant decrease in the amount of sulfur on the polymer surface and only minor sulfur oxidation. This observation led to the conclusion that added oxygen removed/prevented sulfur deposition on the polymer surface. Enhanced results were obtained by a sequential treatment in H 2 S and then O 2 plasma, where oxidation of sulfur and formation of –SO and –SO 2 functional groups were observed. The O 2 plasma exposure had to be short enough to prevent the unwanted removal of sulfur from the surface. High platelet adhesion was observed for all plasma‐treated surfaces. Copyright © 2016 John Wiley & Sons, Ltd.