Ultraviolet-induced surface modification of polyurethane films in the presence of oxygen or acrylic acid vapours

Weibel, Daniel Eduardo; Michels, Alexandre F.; Horowitz, Flávio; Cavalheiro, Ricardo da Silva; Mota, Gunar Vingre da Silva

doi:10.1016/j.tsf.2009.03.204

Cited by 28 publications

(37 citation statements)

References 37 publications

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“…Simultaneously, the typical spectroscopic features of PS films slowly decreased until almost complete disappearance at 60 min of irradiation time. Identical results were obtained previously for PU films functionalized by UV-assisted irradiation in the presence of AA vapours [18]. Plasma polymerized films prepared from AA vapours were also studied by NEXAFS spectroscopy as a function of plasma duty cycle [25].…”

Section: Resultssupporting

confidence: 74%

“…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%

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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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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Polymer Surface Functionalization Using Plasma, Ultraviolet and Synchrotron Radiation

Weibel

2010

Composite Interfaces

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“…For UV radiation we used a commercial medium pressure mercury lamp (250 W), collimated with a quartz lens 2.54 mm in diameter. Before and after UV irradiation, the photochemical reactor was flushed several times (15 min) with the reactive gas (either pure oxygen or a stream of nitrogen carrying AA vapor). AA gas phase monomers were introduced into the reactor by heating an AA liquid reservoir at 50 °C with simultaneous nitrogen bubbling (5 cm 3 s −1 ) .…”

Section: Methodsmentioning

confidence: 99%

“…Before and after UV irradiation, the photochemical reactor was flushed several times (15 min) with the reactive gas (either pure oxygen or a stream of nitrogen carrying AA vapor). AA gas phase monomers were introduced into the reactor by heating an AA liquid reservoir at 50 °C with simultaneous nitrogen bubbling (5 cm 3 s −1 ) . When experiments were carried out in the presence of O 2 , a constant flux of 5 cm 3 s −1 was again used.…”

Section: Methodsmentioning

confidence: 99%

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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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Electrospun Scaffolds of Biodegradable Polyesters: Manufacturing and Biomedical Application

Pranke

Weibel

Braghirolli

2015

Biodegradable Polyesters

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Ultraviolet-induced surface modification of polyurethane films in the presence of oxygen or acrylic acid vapours

Cited by 28 publications

References 37 publications

Polymer Surface Functionalization Using Plasma, Ultraviolet and Synchrotron Radiation

Polymer Surface Functionalization Using Plasma, Ultraviolet and Synchrotron Radiation

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

Electrospun Scaffolds of Biodegradable Polyesters: Manufacturing and Biomedical Application

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