Fluoration du polyéthylène par plasma froid: mouillabilité, indice limite d'oxygène, coefficient de frottement

Chasset, R.; Legeay, G.; Touraine, Jean-Charles; Arzur, Bernard

doi:10.1016/0014-3057(88)90064-x

Cited by 7 publications

(1 citation statement)

References 9 publications

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“…3 6-8 Unfortunately, this latter property means that the material is hydrophobic, and consequently has a weak surface energy 9. It cannot be moistened10 and does not favour regular flow of an aqueous fluid. These perforated silicone plugs therefore rapidly became non-functional due to secretions obstructing the central orifice.…”

Section: Discussionmentioning

confidence: 99%

Clinical and scintigraphic comparison of silicone and polyvinylpyrrolidone coated silicone perforated plugs

Malet

Challier

Neal

et al. 1998

British Journal of Ophthalmology

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Background/aim-Isolated stenosis of the lacrimal punctum is a frequent cause of epiphora. Treatment relies on surgical opening or dilatation with bi-or monocanalicular prosthesis. Recently, silicone perforated punctum plugs (PPP) were proposed. The drawback with these silicone PPP was that secretions accumulate in the central orifice blocking the spontaneous flow of tears. A modification of the surface of the PPP using polyvinylpyrrolidone (PVP) was thus proposed. The aim was to compare silicone PPP with new PVP surface treated PPP. Methods-A prospective study was conducted of 20 patients with dilatable stenosis of the lacrimal puncta who developed epiphora. Epiphora, tolerance, implantation of the PPP, and lacrimal drainage were evaluated using scintigraphy of the lacrimal ducts. Results-The raw data and statistical analysis showed evidence of a superior performance of PVP surface treated PPP. Conclusion-Long term evaluation of the advantages or risks of PVP plugs and comparison with microsurgical punctoplasty are warranted.

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Section: Discussionmentioning

confidence: 99%

Clinical and scintigraphic comparison of silicone and polyvinylpyrrolidone coated silicone perforated plugs

Malet

Challier

Neal

et al. 1998

British Journal of Ophthalmology

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Polyethylene plasma fluorination and permeability relationships to methanol‐gasoline mixtures

Serpe

Huiban

Lynch

et al. 1996

J. Appl. Polym. Sci.

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SYNOPSISIn the case of cold plasma fluorination we analyzed effects of the main processing conditions (power, exposure time, nature of gas, and number of fluorinated faces) on gasoline permeability of polyethylenes. Optimization of processing conditions gave us a permeability reduction of 30% compared to untreated polyethylene. XPS analysis of fluorinated specimens before permeation experiments shows the PE to be highly fluorinated at the surface with a F/C ratio up to 2. Fluorination appeared to be homogeneous over the disk surface with a concentration depth profile showing a step decline below the extreme surface. However, significant fluorination is achieved only up to a few tens of nanometers (20 to 30). A more interesting effect is the evidence for chain breaking during the process suggests the creation of short chain segments at the surface. These segments would be highly fluorinated but easily leeched out by the diffusing molecules. Leeching seems more important with alcohol containing gasolines. These data show clearly that fluorination by cold plasmas in the conditions under studies has not a permanent effect.

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Traitement de surface d'un polyurethane par plasma froid: fixation de fluor

Benoist¹,

Legeay²

1994

European Polymer Journal

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Fluoration du polyéthylène par plasma froid: mouillabilité, indice limite d'oxygène, coefficient de frottement

Cited by 7 publications

References 9 publications

Clinical and scintigraphic comparison of silicone and polyvinylpyrrolidone coated silicone perforated plugs

Clinical and scintigraphic comparison of silicone and polyvinylpyrrolidone coated silicone perforated plugs

Polyethylene plasma fluorination and permeability relationships to methanol‐gasoline mixtures

Traitement de surface d'un polyurethane par plasma froid: fixation de fluor

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