scholarly journals Improvement of Adhesion Properties of Polyamide 6 and Polyoxymethylene-Copolymer by Atmospheric Cold Plasma Treatment

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1380 ◽  
Author(s):  
Zoltán Károly ◽  
Gábor Kalácska ◽  
László Zsidai ◽  
Miklós Mohai ◽  
Szilvia Klébert
Keyword(s):  
Plasma Treatment ◽  
Cold Plasma ◽  
Polymer Surface ◽  
Polyamide 6 ◽  
Surface Barrier ◽  
Adhesion Properties ◽  
Atmospheric Air ◽  
Engineering Polymers ◽  
Steel Joints ◽  
Barrier Discharges

A study is presented on cold plasma treatment of the surfaces of two engineering polymers, polyamide 6 (PA6) and polyoxymethylene (POM-C), by diffuse coplanar surface barrier discharges under atmospheric air conditions. We found that plasma treatment improved the adhesion of both polymers for either polymer/polymer or polymer/steel joints. However, the improved adhesion was selective for the investigated adhesive agents that were dissimilar for the two studied polymers. In addition, improvement was significantly higher for PA6 as compared to POM-C. The observed variation of the adhesion was discussed in terms of the changes in surface chemistry, wettability and topography of the polymer surface.

scholarly journals Effect of Atmospheric Cold Plasma Treatment on the Adhesion and Tribological Properties of Polyamide 66 and Poly(Tetrafluoroethylene)

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 658 ◽  
Author(s):  
Zoltán Károly ◽  
Gábor Kalácska ◽  
Jacob Sukumaran ◽  
Dieter Fauconnier ◽  
Ádám Kalácska ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Tribological Properties ◽  
Cold Plasma ◽  
Polymer Surface ◽  
Surface Barrier ◽  
Polyamide 66 ◽  
Atmospheric Air ◽  
Engineering Polymers ◽  
Steel Joints ◽  
Barrier Discharges

The surfaces of two engineering polymers including polyamide 66 (PA66) and polytetrafluoroethylene (PTFE) were treated by diffuse coplanar surface barrier discharges in atmospheric air. We found that plasma treatment improved the adhesion of PA66 for either polymer/polymer or polymer/steel joints, however, it was selective for the investigated adhesive agents. For PTFE the adhesion was unaltered for plasma treatment regardless the type of used adhesive. Tribological properties were slightly improved for PA66, too. Both the friction coefficient and wear decreased. Significant changes, again, could not be detected for PTFE. The occurred variation in the adhesion and tribology was discussed on the basis of the occurred changes in surface chemistry, wettability and topography of the polymer surface.

scholarly journals Enhancing the surface properties of linen by non-thermal atmospheric air-plasma treatment

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Orsolya Erzsébet Szabó ◽  
Emília Csiszár ◽  
András Tóth
Keyword(s):  
Plasma Treatment ◽  
Plasma Reactor ◽  
Fiber Surface ◽  
Surface Barrier ◽  
Air Plasma ◽  
Water Contact ◽  
Atmospheric Air ◽  
Polar Groups ◽  
Surface Barrier Discharge ◽  
Air Plasma Treatment

AbstractIn this research, a diffuse coplanar surface barrier discharge (DCSBD) type plasma reactor was used for the surface modification of raw linen fabric. Changes in physical properties and chemical composition of the fiber surface as well as color of the fabric were measured as a function of time of the atmospheric air plasma treatment. Furthermore, ageing of the effects created on the fiber surface by plasma treatment was also characterized in a period of 0-14 days elapsed after the plasma treatment. Significant differences were found between the properties of the raw and plasma treated linen fabrics, including increase of wettability, wickability, surface energy and O/C ratio, and decrease of water contact angle and deterioration of the waxy outer layer of the fibers. Most of the parameters depended on the time of plasma treatment (0–180 s). O/C ratio increased steadily with the increase of duration of the plasma treatment, which was explained by destruction of the waxy surface layer, creation of polar groups and exposure of cellulosic components. Most of the properties tested were found to be stable during two weeks of storage after the plasma treatment, indicating that the surface ‘topography’ created by plasma remained almost unaltered and the recovery of the etched waxy coverage of the fiber did not occur.

Study on the electrical and surface properties of Polyamide 6 woven fabrics using pen-type radio frequency plasma treatment

2011 ◽  
Vol 41 (3) ◽  
pp. 185-200 ◽  
Author(s):  
Kou-Bing Cheng ◽  
Jen-Yung Liu ◽  
Jin-Fong Hwang ◽  
Mei-Hui Lee ◽  
Chien-Cheng Hsieh
Keyword(s):  
Plasma Treatment ◽  
Surface Properties ◽  
Functional Groups ◽  
Irradiation Time ◽  
Polymer Surface ◽  
Polyamide 6 ◽  
Woven Fabrics ◽  
Surface Plasma ◽  
Frequency Plasma ◽  
Hydrophilicity Modification

This study showed an improvement in how functional groups activate on to the polymer surface by using the pen-type plasma treatment. These functional groups will graft on to the original polymer bonds and activate the surfaces of polymer products such as synthetic fabrics, films, and plastics. This research discussed the modifications of the hydrophilicity and conductivity in Polyamide 6 woven fabrics prior to and following the surface plasma treatment. First, without considering any processing, such as calendering, fabrics with the same denier but different numbers of filament were compared after the plasma treatment. The analysis of the experiment verifies that after the plasma treatment, the finer the filament the fiber has, the better improvements are obtained in the surface properties, such as hydrophilicity and surface resistivity. Next, after including the factor of calendering, the experiment also confirmed that the Polyamide 6 fabric processed with calendering exhibits better modification affects than those without it. In addition, the hydrophilicity modification result increases with irradiation time for fabrics treated with pen-type plasma, where the hydrophilicity modification benefit improves by 20–30%. Moreover, fabrics coated with poly-3, 4-ethylenedioxythiophene (PEDOT) are tested by washing. It has been confirmed that the washing resistance of the conductivity benefit appears to improve with the number of calendering times and irradiation time. The spectra show formation of COOH-groups (3300–2400 cm−1), after impregnated acrylic acid process, and also show formation of O–H (alcohol) groups (3650–3200 cm−1), after PEDOT coating.

Cold Plasma Treatment Promotes Full-thickness Healing of Skin Wounds in Murine Models

2021 ◽  
pp. 153473462110021
Author(s):  
Joon M. Jung ◽  
Hae K. Yoon ◽  
Chang J. Jung ◽  
Soo Y. Jo ◽  
Sang G. Hwang ◽  
...  
Keyword(s):  
Wound Healing ◽  
Plasma Treatment ◽  
Cold Plasma ◽  
Smooth Muscle Actin ◽  
Treated Group ◽  
Control Group ◽  
Alpha Smooth Muscle Actin ◽  
Skin Wound Healing

Cold plasma can be beneficial for promoting skin wound healing and has a high potential of being effectively used in treating various wounds. Our aim was to verify the effect of cold plasma in accelerating wound healing and investigate its underlying mechanism in vitro and in vivo. For the in vivo experiments, 2 full-thickness dermal wounds were created in each mouse (n = 30). While one wound was exposed to 2 daily plasma treatments for 3 min, the other wound served as a control. The wounds were evaluated by imaging and histological analyses at 4, 7, and 11 days post the wound infliction process. Immunohistochemical studies were also performed at the same time points. In vitro proliferation and scratch assay using HaCaT keratinocytes and fibroblasts were performed. The expression levels of wound healing–related genes were analyzed by real-time polymerase chain reaction and western blot analysis. On day 7, the wound healing rates were 53.94% and 63.58% for the control group and the plasma-treated group, respectively. On day 11, these rates were 76.05% and 93.44% for the control and plasma-treated groups, respectively, and the difference between them was significant ( P = .039). Histological analysis demonstrated that plasma treatment promotes the formation of epidermal keratin and granular layers. Immunohistochemical studies also revealed that collagen 1, collagen 3, and alpha-smooth muscle actin appeared more abundantly in the plasma-treated group than in the control group. In vitro, the proliferation of keratinocytes was promoted by plasma exposure. Scratch assay showed that fibroblast exposure to plasma increased their migration. The expression levels of collagen 1, collagen 3, and alpha-smooth muscle actin were elevated upon plasma treatment. In conclusion, cold plasma can accelerate skin wound healing and is well tolerated.

Effect of atmospheric cold plasma treatment on technological and nutrition functionality of protein in foods

2021 ◽  
Author(s):  
Neda Mollakhalili-Meybodi ◽  
Mojtaba Yousefi ◽  
Amene Nematollahi ◽  
Nasim Khorshidian
Keyword(s):  
Plasma Treatment ◽  
Cold Plasma

scholarly journals In-package atmospheric pressure cold plasma treatment of cherry tomatoes

2014 ◽  
Vol 118 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Nrusimha Nath Misra ◽  
Kevin M. Keener ◽  
Paula Bourke ◽  
Jean-Paul Mosnier ◽  
Patrick J. Cullen
Keyword(s):  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Cherry Tomatoes
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