Dynamics of Polmeric Solid Surfaces Treated by Oxygen Plasma: Plasma-Induced Increases in Surface Molecular Mobility of Polystyrene

Murakami, Tatsunosuke; Kuroda, Shin–ichi; Osawa, Zenjiro

doi:10.1006/jcis.1997.5276

Cited by 29 publications

(41 citation statements)

References 17 publications

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“…Etching of the polymer surface takes place together with functionalization (11); low-molecular-weight fragments are produced and may be removed by solvents (6 -8). It appears that the molecular mobility of the polystyrene chains is enhanced by the plasma treatment (7). The surface of plasma-oxidized polystyrene undergoes reorganizations on aging, as a result of both diffusion and molecular motions (12).…”

Section: Introductionmentioning

confidence: 99%

Atomic Force Microscopy and Wettability Study of Oxidized Patterns at the Surface of Polystyrene

Dupont‐Gillain

Nysten

Hlady

et al. 1999

Journal of Colloid and Interface Science

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The surface properties of patterned surfaces made by a combination of photolithography and oxygen plasma treatment of polystyrene (PS) were investigated. PS and plasma-treated PS (PSox) were first characterized using X-ray photoelectron spectroscopy and the study of wetting dynamics (Wilhelmy plate method) in water and in solutions of different pH. The results indicated that the PSox surface may be viewed as covered with a polyelectrolyte-like gel, which swells depending on pH. It was then shown, using atomic force microscopy (AFM), that the adhesion force measured on PS with a silicon tip in water was higher compared with that measured on PSox. This feature allowed imaging of the oxidation patterns using the adhesion mapping mode. The origin of the pulloff force contrast, which could not be explained by combining Johnson-Kendall-Roberts theory and thermodynamic considerations, was attributed to repulsion between the tip and hydrated polymer chains present on the oxidized surface. Imaging was also performed in the lateral force mode, a higher friction being recorded on PS than on PSox. Copyright 1999 Academic Press.

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Section: Introductionmentioning

confidence: 99%

Atomic Force Microscopy and Wettability Study of Oxidized Patterns at the Surface of Polystyrene

Dupont‐Gillain

Nysten

Hlady

et al. 1999

Journal of Colloid and Interface Science

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“…[14] However, it is well known that surface roughness affects contact angle. [15,16] The effect of surface roughness on hydrophobicity can be explained by two distinct wetting behaviors depending on the surface geometrical structure and the extent of roughness.…”

Section: Introductionmentioning

confidence: 99%

Wetting properties of polystyrene/divinylbenzene crosslinked porous polymers obtained using W/O highly concentrated emulsions as templates

Molina¹,

Vílchez²,

Canal³

et al. 2009

Surface & Interface Analysis

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Macroporous polystyrene/divinylbenzene (PS-DVB) monoliths were obtained using highly concentrated W/O emulsions as templates. These monoliths are of interest due to the high potential applications for catalysis, scaffolds for tissue engineering, filters, membranes, or drug delivery systems. Dynamic wetting behavior through the polymer monolith is directly related to contact angle. For this reason, in this paper we investigate the relationship between contact angle, morphology, and chemical composition of the dense skin layer and the highly porous interior surface of PS-DVB porous monoliths.Whereas the dense skin layer exhibits a Wenzel regime using water as wetting liquid, the highly porous interior surface exhibits a Cassie-Baxter regime. This behavior is correlated with the roughness observed by scanning electron microscopy (SEM). However, the observed contact angle hysteresis seems to indicate that factors other than surface roughness should be taken into account. For this reason, chemical composition was also studied by elemental microanalysis and X-ray photoelectron spectroscopy (XPS). The differences in chemical composition observed between the dense skin layer and the highly porous interior surface, according to the wetting model for a heterogeneous surface proposed by Johnson and Dettre, seems also to contribute to the wetting hysteresis. The different wetting between the dense skin layer and the highly porous interior surface results in a dual wettability phenomenon, in which a liquid wets the dense skin layer and does not penetrate into the highly porous interior of the PS-DVB monoliths. This phenomenon can be of relevance in absorption or desorption processes such as in drug delivery processes.

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“…This phenomenon is commonly attributed to chain scission reactions producing low molecular weight oxidized material (LMWOM) on the surface (7). The detrimental effect of dry storage for most hydrophilized plastics surfaces is also well known (4,5,(8)(9)(10)(11)(12)(13), and this hydrophobic recovery is normally explained by a combination of (a) surface reorientation effects, (b) migration of mobile species from the bulk toward the surface, and (c) external contamination (8).…”

Section: Introductionmentioning

confidence: 99%

Stability of Polycarbonate and Polystyrene Surfaces after Hydrophilization with High Intensity Oxygen RF Plasma

Larsson¹,

Dérand²

2002

Journal of Colloid and Interface Science

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Dynamics of Polmeric Solid Surfaces Treated by Oxygen Plasma: Plasma-Induced Increases in Surface Molecular Mobility of Polystyrene

Cited by 29 publications

References 17 publications

Atomic Force Microscopy and Wettability Study of Oxidized Patterns at the Surface of Polystyrene

Atomic Force Microscopy and Wettability Study of Oxidized Patterns at the Surface of Polystyrene

Wetting properties of polystyrene/divinylbenzene crosslinked porous polymers obtained using W/O highly concentrated emulsions as templates

Stability of Polycarbonate and Polystyrene Surfaces after Hydrophilization with High Intensity Oxygen RF Plasma

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