Study of the influence of the acrylic acid plasma parameters on silicon and polyurethane substrates using XPS and AFM

Vilani, Cecília; Weibel, Daniel Eduardo; Zamora, R.R.M.; Habert, Alberto Cláudio; Achete, Carlos A.

doi:10.1016/j.apsusc.2007.07.060

Cited by 35 publications

(30 citation statements)

References 18 publications

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“…For plasma‐polymerized AA deposited films, it has previously been found that the concentration of carboxylic acid and carboxylate ester groups decreased when the power level increased, because the film became more crosslinked or branched . This effect was clearly shown in a surface modification study of PU membranes using AA vapor plasma . Only when the power level was 5 W was it possible to preserve a pristine PAA film formed on top of the PU membrane under AA plasma treatment.…”

Section: Discussionmentioning

confidence: 95%

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Kessler¹,

Kühn²,

Radtke³

et al. 2012

Polymer International

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Hydrophilic and superhydrophilic surfaces of poly(sulfone) (PSU) thin films were prepared by UV irradiation in the presence of O2 or acrylic acid (AA) vapor. Treated surfaces were then investigated by water contact angle measurements, Fourier transformed IR spectroscopy in attenuated total reflectance mode (FTIR‐ATR), X‐ray photoelectron spectroscopy (XPS), near‐edge X‐ray absorption fine structure (NEXAFS) and AFM. Water contact angle values of treated PSU films using either O2 or AA vapor as the reactive atmosphere reached about 6° after more than 120 min of irradiation. FTIR‐ATR, XPS and NEXAFS analysis showed incorporation of oxygenated groups onto the surface that led to its hydrophilic characteristics. In addition, when AA vapor was used as the reactive atmosphere, a photopolymerization process of poly(acrylic acid) onto the surface of the PSU was observed. AFM analysis showed a very low level of roughness after the treatments. A comparison of UV‐assisted surface modifications of PSU films with traditional plasma treatments showed excellent qualitative agreement between the two techniques. Our results show that UV‐assisted treatments in the presence of AA vapor or O2 are efficient ways of controlling the surface wettability and functionalities grafted on the surface of PSU films. This treatment can be considered as a permanent dry grafting method that resists aging and uses a simple experimental setup. © 2012 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 95%

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Kessler¹,

Kühn²,

Radtke³

et al. 2012

Polymer International

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“…In previous publications [15,16] we observed that low-pressure AA plasma treatments led to a polymerization of poly(acrylic acid) (PAA) on top of PU membranes and Si (100) substrates. To know the effect of the UV-assisted treatment on PU and PS films in the presence of reactive gases a series of experiments were carried out at several photolysis times.…”

Section: Resultsmentioning

confidence: 98%

“…Taking into account our recent work carried out on surface functionalization of polyurethane (PU) by low-pressure plasma treatment [15][16][17] and UV-assisted modification in the presence of reactive gases [18], we present in this paper the results of UV-assisted surface modification and synchrotron radiation (SR) surface selective functionalization in the presence of reactive gases of two polymers: PU and PS. A brief comparison with previous PU plasma treatment results is also included.…”

Section: Introductionmentioning

confidence: 99%

Polymer Surface Functionalization Using Plasma, Ultraviolet and Synchrotron Radiation

Weibel

2010

Composite Interfaces

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Polyurethane (PU) and polystyrene (PS) films were functionalized by ultraviolet (UV) or selective synchrotron radiations (SR) in the presence of reactive gases. The UV-PU results were compared with lowpressure plasma treatments of the same films. Oxygen or acrylic acid vapours (AA) were used as reactive gases. X-ray photoelectron spectroscopy measurements of UV modified films in the presence of oxygen or AA matched the RF-plasma treatments results. It is shown that COO and C=O functional groups were incorporated at the polymer surface efficiently with both methodologies. In addition, near-edge X-ray absorption fine structure showed that a thin film of poly(acrylic acid) is formed over the PU and PS films during the UV irradiation in the presence of AA vapours. These results resemble previous AA low-power plasma treatments. PU and PS films were also selectively functionalized by SR using oxygen as reactive gas. Surface concentrations of COO and C=O functional groups were enhanced by C 1s → σ * C−C excitation after irradiation and oxygen introduction. This efficient surface functionalization was clearly observed in PS films which do not have CO and COO groups in their molecular structure. Excitations involving transitions to π * orbital (π * C=C , π * C=O ) led to much lower functionalization efficiency. The SR results can be explained by taking into account previous photon stimulated ion desorption studies of polymers. SR results may open new ways to functionalize polymer surfaces selectively and efficiently.

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“…In AFM, a flexible cantilever moves across the surface in contact mode or lightly touching the surface in tapping mode. The change in height is measured by a reflected laser beam into a photodetector, and three‐dimensional (3D) topographic images are generated from which surface roughness values can be calculated 10,64,79. CSLM can produce high‐resolution images and 3D reconstructions in a variety of materials and biological specimens.…”

Section: Different Strategies Using Plasma To Improve Hemocompatibilimentioning

confidence: 99%

Application of plasma surface modification techniques to improve hemocompatibility of vascular grafts: A review

Solouk

Cousins

Mirzadeh

et al. 2011

Biotech and App Biochem

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Surface modification using plasma processing can significantly change the chemical and physical characteristics of biomaterial surfaces. When used in combination with additional modification techniques such as direct chemical or biochemical methods, it can produce novel biomaterial surfaces, which are anticoagulant, bioactive, and biomimetic in nature. This article reviews recent advances in improving hemocompatibility of biomaterials by plasma surface modification (PSM). The focus of this review is on PSM of the most commonly used polymers for vascular prostheses such as expanded polytetrafluoroethylene (PTFE), polyethylene terephthalate (Dacron(®) ), and next generation of biomaterials, including polyhedral oligomeric silsesquioxane nanocomposite.

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Study of the influence of the acrylic acid plasma parameters on silicon and polyurethane substrates using XPS and AFM

Cited by 35 publications

References 18 publications

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Polymer Surface Functionalization Using Plasma, Ultraviolet and Synchrotron Radiation

Application of plasma surface modification techniques to improve hemocompatibility of vascular grafts: A review

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