Surface properties of a specifically modified high-grade medical polyurethane

Sidouni, F.-Z; Nurdin, Nathalie; Chabrecek, Peter; Lohmann, Dieter; Vogt, J.; Xanthopoulos, N.; Mathieu, H; François, Patrice; Vaudaux, Pierre; Descouts, P.

doi:10.1016/s0039-6028(01)01299-7

Cited by 41 publications

(23 citation statements)

References 43 publications

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“…The literature contact angle values of water on PU surface vary from 65 and 75 . 11,12 Therefore, the contact angle value of water on untreated PU films obtained in this experiment is within the predicted range. When the PU surface is UVO treated, its contact angle decreases.…”

Section: Contact Angle Analysis Of Pu Filmssupporting

confidence: 79%

Improved surface wettability of polyurethane films by ultraviolet ozone treatment

Kuang

Lee

Kim

et al. 2010

J of Applied Polymer Sci

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The wettability of polyurethane (PU) was altered using ultraviolet ozone (UVO) treatment. The effect of UVO treatment on PU surface chemistry was investigated with various experiments. The direct measurement of sessile drops was employed to quantify the static contact angle of different wetting liquids on homogeneous PU films with various UVO treatment times. The contact angle of DI water droplets was decreased to 17.2 from 70.04 after 5 min UVO treatment. The surface free energy of PU films was 51.46 mN m À1 before treatment and was increased to 71.5 mN m À1 after being fully treated. X-ray photoelectron spectroscopy (XPS) analysis shows a significant amount of polar functional species (CAO and C¼ ¼O bonding) were formed on the PU surface by UVO treatment. atomic force microscopy (AFM) characterization shows the PU surface morphology was different before and after UVO treatment. The effect of water washing on UVO treated surface was also investigated. An aging effect study indicates the UVO modification can sustain the improved wettability with limited hydrophobic recovery, where the DI water contact angle remains constant at around 22 after the UVO treatment.

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Section: Contact Angle Analysis Of Pu Filmssupporting

confidence: 79%

Improved surface wettability of polyurethane films by ultraviolet ozone treatment

Kuang

Lee

Kim

et al. 2010

J of Applied Polymer Sci

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“…1 For the case of a polymeric template, successful adhesion of endothelial cells to a typically inert, unmodified polymer depends on the chemical constitution of the surface. Surface modifications, such as the adsorption of extracellular matrix (ECM) proteins [2][3][4] and the covalent attachment of specific RGD peptide sequences, 1,[5][6][7] have been found to promote endothelial cell adhesion onto a variety of synthetic materials. Relative to studies involving surface chemistry, systematic studies of surface topography have only recently received significant attention.…”

Section: Introductionmentioning

confidence: 99%

Topographic guidance of endothelial cells on silicone surfaces with micro‐ to nanogrooves: Orientation of actin filaments and focal adhesions

Uttayarat

Toworfe

Dietrich

et al. 2005

J Biomedical Materials Res

185

174

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To mimic the uniformly elongated endothelium in natural linear vessels, bovine aortic endothelial cells (BAECs) are cultured on micro- to nanogrooved, model poly(dimethylsiloxane) (PDMS) substrates preadsorbed with about 300 ng/cm(2) of fibronectin. BAEC alignment, elongation, and projected area were investigated for channel depths of 200 nm, 500 nm, 1 microm, and 5 microm, as well as smooth surfaces. Except for the 5 microm case, the ridge and channel widths were held nearly constant about 3.5 microm. With increasing channel depth, the percentage of aligned BAECs increased by factors of 2, 2, 1.8, and 1.7 for 1, 4, 24, and 48 h. Maximum alignment, about 90%, was observed for 1 microm deep channels at 1 h. The alignment of BAECs on grooved PDMS was maintained at least until cells reached near confluence. F-actin and vinculin at focal adhesions also aligned with channel direction. Analysis of confocal microscopy images showed that focal adhesions localized at corners and along the sidewalls of 1-microm deep channels. In contrast, focal adhesions could not form on the bottom of the 5-microm deep channels. Cell proliferation was similar on grooved and smooth substrates. In summary, PDMS substrates engraved with micro- and nanochannels provide a powerful method for investigating the interplay between topography and cell/cytoskeletal alignment.

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“…1 The technique has been applied to the study of a wide range of systems, including: single crystals, 2 alkanethiols on gold, 3 conducting polymers, 4,5 polyurethanes 6 and biological surfaces. 7 Qualitative friction data may be obtained by subtracting the lateral force reverse trace from the forward trace.…”

Section: Introductionmentioning

confidence: 99%

Friction coefficient mapping using the atomic force microscope

Breakspear

Smith

Nevell

et al. 2004

Surface & Interface Analysis

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A friction coefficient map of the surface of an immiscible polymer blend has been constructed using data obtained with the atomic force microscope. Spatially resolved friction coefficients, obtained from gradients of linear plots of frictional force versus applied load, were used to construct the map, with corresponding frictional forces being derived from lateral force data and the lateral spring constant. Values of the friction coefficient were confirmed using an Si 3 N 4 /Si 3 N 4 couple, for which literature values were available. Excellent agreement with the literature was observed through the use of this method.

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Surface properties of a specifically modified high-grade medical polyurethane

Cited by 41 publications

References 43 publications

Improved surface wettability of polyurethane films by ultraviolet ozone treatment

Improved surface wettability of polyurethane films by ultraviolet ozone treatment

Topographic guidance of endothelial cells on silicone surfaces with micro‐ to nanogrooves: Orientation of actin filaments and focal adhesions

Friction coefficient mapping using the atomic force microscope

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