scholarly journals Modification of PET surface properties using extremely non-equilibrium oxygen plasma

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Ita Junkar ◽  
Martina Modic ◽  
Miran Mozeti
Keyword(s):  
Surface Layer ◽  
Surface Properties ◽  
Polyethylene Terephthalate ◽  
Oxygen Plasma ◽  
Rf Discharge ◽  
Atom Density ◽  
Structural Modifications ◽  
Glass Chamber ◽  
Pet Foils ◽  
Equilibrium Oxygen

AbstractPolyethylene terephthalate (PET) foils have been exposed to oxygen plasma and its afterglow in order to reveal compositional and structural modifications of the surface layer. Oxygen plasma was created by electrode-less RF discharge in a glass chamber so the O-atom density was close to 1022 m

scholarly journals On the Effectiveness of Oxygen Plasma and Alkali Surface Treatments to Modify the Properties of Polylactic Acid Scaffolds

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1643
Author(s):  
Ricardo Donate ◽  
María Elena Alemán-Domínguez ◽  
Mario Monzón
Keyword(s):  
Surface Properties ◽  
Enzymatic Degradation ◽  
Oxygen Plasma ◽  
Physicochemical Characterization ◽  
Surface Treatments ◽  
Carboxyl Groups ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Angle Measurements ◽  
3D Printed

Surface modification of 3D-printed PLA structures is a major issue in terms of increasing the biofunctionality and expanding the tissue engineering applications of these parts. In this paper, different exposure times were used for low-pressure oxygen plasma applied to PLA 3D-printed scaffolds. Alkali surface treatments were also evaluated, aiming to compare the modifications introduced on the surface properties by each strategy. Surface-treated samples were characterized through the quantification of carboxyl groups, energy-dispersive X-ray spectroscopy, water contact angle measurements, and differential scanning calorimetry analysis. The change in the surface properties was studied over a two-week period. In addition, an enzymatic degradation analysis was carried out to evaluate the effect of the surface treatments on the degradation profile of the 3D structures. The physicochemical characterization results suggest different mechanism pathways for each type of treatment. Alkali-treated scaffolds showed a higher concentration of carboxyl groups on their surface, which enhanced the enzymatic degradation rate, but were also proven to be more aggressive towards 3D-printed structures. In contrast, the application of the plasma treatments led to an increased hydrophilicity of the PLA surface without affecting the bulk properties. However, the changes on the properties were less steady over time.

Composite polyethylene terephthalate track membranes with thin teflon-like layers: Preparation and surface properties

2019 ◽  
Vol 476 ◽  
pp. 452-459 ◽  
Author(s):  
V. Satulu ◽  
B. Mitu ◽  
A.M. Pandele ◽  
S.I. Voicu ◽  
L. Kravets ◽  
...  
Keyword(s):  
Surface Properties ◽  
Polyethylene Terephthalate ◽  
Track Membranes

The Modification of Carbon Included Polyethylene Surface by Plasma Treatment for Metallizing Using a Low Pressure RF Discharge Plasma

2005 ◽  
Vol 8 (1) ◽  
Author(s):  
Jeou-Long Lee ◽  
Chung-Ming Liu ◽  
Kuen Ting ◽  
Wei-Kung Cheng ◽  
Takayoshi Tsuchida ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Layer ◽  
Discharge Plasma ◽  
Treatment Time ◽  
Low Pressure ◽  
Rf Discharge ◽  
Nickel Layer ◽  
Good Adhesion ◽  
Polyethylene Surface

AbstractSurface modification of the carbon included polyethylene (semi-conductive PE) surface for metallizing using a low pressure RF discharge plasma has been carried out. The contact angle was used as a measure of the wettability of the PE surface. The roughness and the chemical bondings in PE surface layer were analized by DFM and XPS, respectively. Typical results show that the contact angle decreases from approximately 94° to below 10° after several minutes' treatment and recovers to a saturation value when it was put open to the air after treatment. The saturation value of the contact angle is smaller as the gas pressure for treatment is higher and the treatment time is longer but all are below approximately 60° which is still smaller than that of untreated. DFM and XPS results show that the surface roughness and the bondings C-O and C=O in the PE surface layer also increase with increasing the treatment time and seem to be responsible for improving the hydrophilic property of PE. After pretreatment process, nickel was coated on the PE sheet by electrodeposition method and a good adhesion between the nickel layer and the PE surface compared with that of untreated was obtained.

scholarly journals New Possibilities of Shaping the Surface Properties in Austempered Ductile Iron Castings

2013 ◽  
Vol 13 (1) ◽  
pp. 103-106 ◽  
Author(s):  
D. Myszka
Keyword(s):  
Surface Layer ◽  
Surface Properties ◽  
Ductile Iron ◽  
Shot Peening ◽  
Austempered Ductile Iron ◽  
Protective Atmosphere ◽  
Detonation Spraying ◽  
Iron Castings ◽  
Recent Developments ◽  
Commercial Applications

Abstract The paper presents recent developments concerning the formation of surface layer in austempered ductile iron castings. It was found that the traditional methods used to change the properties of the surface layer, i.e. the effect of protective atmosphere during austenitising or shot peening, are not fully satisfactory to meet the demands of commercial applications. Therefore, new ways to shape the surface layer and the surface properties of austempered ductile iron castings are searched for, to mention only detonation spraying, carbonitriding, CVD methods, etc.

The Use of Froth Flotation for Selective Separation of Plastic Wastes from Soil

2021 ◽  
Vol 6 (4) ◽  
pp. 135-138
Author(s):  
Kofi Moro ◽  
Dorothy A. Dechie
Keyword(s):  
Surface Properties ◽  
Polyethylene Terephthalate ◽  
Tannic Acid ◽  
Froth Flotation ◽  
Selective Separation ◽  
Composite Sample ◽  
Molecular Weights ◽  
Plastic Wastes ◽  
Chain Lengths ◽  
Selective Separations

  The Use of Froth Flotation for Selective Separation of Plastic Wastes from Soil   Kofi Moro and Dorothy A. Dechie   Abstract — In recycling of plastics, unless the goal is to form composites or materials having special properties, it is not advisable to mix plastics of different kinds because of the differences in their molecular weights and chain lengths. Hence, there is the need to separate these plastics when they are mixed before recycle can be done. This project investigated the selective separation of Polypropylene (PP), Polystyrene (PS) and Polyethylene terephthalate (PET) plastics out of soils using froth flotation. Pulverized samples were prepared from post-consumer plastic sources (PP, PS and PET) and soil and mixed uniformly to form a composite sample. The composite sample was subjected to froth flotation. Two tests were performed. A first test, where there was no addition of a depressant (tannic acid), and a second test, where there was addition of tannic acid to depress some of the plastics in order to selectively separate them. Recoveries from each test work indicated that, plastics are naturally hydrophobic and can be floated out of soils without modifying their surface properties. However, selective separations of the plastics were achieved when tannic acid was used to modify the surface properties of the plastic types.

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