Surface Modification of Polycarbonate by Atmospheric-Pressure Plasma Jets (original) (raw)
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SURFACE MODIFICATION OF POLYCARBONATE BY ATMOSPHERIC PRESSURE COLD ARGON/AIR PLASMA JET
In this paper, atmospheric pressure plasma jet and its application for polymer surface modification is reported. Atmospheric pressure plasma jet sustained in Argon/Air mixture has been used to modify the surface properties of polycarbonate (PC). The surface properties of the untreated and plasma treated PC samples were characterized by contact angle measurement with water and glycerol. The contact angles were used to determine the surface energy and its polar and dispersion components. The effect of treatment time, frequency of the applied voltage, distance of the sample from the nozzle on the wettability of the sample was studied. It was found that the contact angle of water in untreated PC sample is 89 o while it decreases to 35 o after 5 minutes of treatment time. Moreover, it was found that, the best plasma treatment can be obtained with frequency 27 kHz and a distance of 1 cm between surface of samples (PC) and plasma jet's nozzle. Our result showed that atmospheric pressure non thermal plasma can be effectively used to enhance the surface wettability and surface energy of PC.
Activation of polycarbonate (PC) surfaces by atmospheric pressure plasma in ambient air
Polymer Testing, 2018
This paper presents the study of the ambient air atmospheric pressure plasma (APP) treatment of polycarbonate (PC) surfaces to improve the wettability. The APP was generated by dielectric barrier discharge of coplanar electrode arrangement: a Diffuse Coplanar Surface Barrier Discharge (DCSBD), and gliding arc APC 500. The changes in wettability of the PC surfaces were characterized by water contact angle measurement, hysteresis analysis of the water contact angle and surface free energy. We found that both plasma sources led to considerable decrease of water contact angle in first second of the treatments. Surface free energy analysis explained, that the decrease of the water contact angle was related to higher polar components of the surface. The modification of the PC surfaces was further evaluated by X-ray photoelectron spectroscopy that showed that both plasma sources led to increase in concentration of polar functional groups on the PC surface. The main difference between DCSBD and APC plasmas was in the surface morphology which observed by atomic force microscopy (AFM).
IEEE Transactions on Plasma Science, 2019
The characterization of an atmospheric pressure microwave argon plasma in the form of a plasma sheet and the results of its use in the investigation of the wettability modification of polyethylene (PE) surfaces are presented in this paper. The spectroscopic investigations performed indicate a plasma temperature at the level of 750-1100 K and an electron density at the level of 2.9-5.4 × 10 14 cm −3. The following PE-type specially prepared materials were subjected to the plasma treatment process: PE (pure low-density PE), PE + UV (PE with a UV stabilizer), PE − UV + M (with a UV stabilizer and a montmorillonite), PE + S (PE with soot), and PE − F (PE with a UV stabilizer, a montmorillonite, and soot). The experimental investigations prove the high potential of the presented method for the PE surface activation in industrial applications. The atomic force microscopy scanning of samples was performed before and after the plasma treatment. The aging of the adhesion enhancement effect indicates that the water contact angle is related to the surface energy changes.
Surface modification of polycarbonate (bisphenol A) by low pressure rf plasma
Himalayan Journal of Sciences, 2006
Effects of low pressure radio frequency (rf) plasma treatment on the surface properties of polycarbonate are presented in this paper. Results obtained from the surface energy measurement after different conditions of treatment are compared. After treatment the surface free energy increased from the original value of 35 mJ/m 2 to 63-74 mJ/m 2 . X-ray photoelectron spectroscopy measurements showed an increase in oxygen to carbon ratio after the treatment indicating an increase of oxygen-containing functional groups on the polycarbonate surface. A study of the stability of the modified surface property has been made on the basis of surface free energy. To study the improvement of adhesion between the polycarbonate and thin coatings, organosilicon thin films were deposited on the untreated and plasma treated polycarbonate. The adhesion of film to substrate was quantitatively analysed by 'cross-hatch peel test'.
Surface Modifications of High Density Polycarbonate by Argon Plasma
The polycarbonate (PC) membranes were implanted to 16 W argon ions plasma. The samples were treated for different exposure time 10 min, 30 min and 60 min. The effect of argon ions implantation on optical and chemical properties of PC membrane has been investigated. The observed changes have been correlated with the induced structural changes in the implanted layer using UV-Visible spectroscopy. The Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) were employed to study the surface characteristics of the membrane. The AFM results indicate significant changes in the surface morphology of the polymer membranes before and after plasma treatment.
The Effect of RF Plasma Treatment on the Surface Activation of Polycarbonate Substrate
In the present study the effect of Ar and Ar/O 2 RF plasma treatment of the surface of the polycarbonate (PC) substrates has been studied. Changes in the surface free energy of the polymer substrates were followed in dependence of the plasma treatment condition (plasma power and plasma treatment time). The polar s p and dispersion s d components of the polymer surface free energy were determined on the basis of the theory of Owens, Wendt, Kaelble and Uy. It was found that s p increase rapidly within the first 1-3 minutes at higher RF power, while s d changes slightly after all plasma gases treatments. The Ar/O 2 plasma treatment at higher RF power also led to pronounced improvement of the adhesion of thin ZnO film, plasma deposited on the modified PC substrate.
Plasma treatment at low pressure for the enhancement of wettability of polycarbonate
2008
The dc glow discharge plasma at low pressure was used for the treatment of polycarbonate surface to investigate the improvement in wettability. The effect of treatment time, applied power and sample-electrode distance on wettability and etching was studied. The surface energy of the sample was found to increase from 29.73 to 64.69 mJ/m 2 with 40s of treatment time. The results showed that wettability and etching of the sample depend strongly on treatment time, applied power and distance from the electrode. The relation for the wettability of the sample as a function of the sample-electrode distance has been found. It was found that dc glow discharge produced at a low pressure air can effectively etch a polycarbonate sample at the rate in the order of 10-9 g/cm 2 /s. The stability of the modified surface by measuring the contact angle at different storage time has been investigated.
RF PLASMA TREATMENT OF POLYCARBONATE SUBSTRATES
The effect of Ar, Ar/C 2 H 5 OH, O 2 and Ar/O 2 RF (13.56 MHz) plasma treatments on surface free energy and morphology, optical properties and adhesion of polycarbonate (PC) substrates has been studied. Changes in the surface properties were followed as a function of the plasma treatment time. The polar and dispersion components of the polymer free surface energy were determined on the basis of the theory of Owens, Wendt, Kaelble and Uy. It was found that all RF plasma treatments led to an increase in the polar component of PC, mainly due to an increased hydrogen bonding ability. The increase in surface free energy reached its maximum at short plasma treatment with 3:1 gas mixture of Ar/O 2 . This treatment also led to pronounced improvement of the adhesion of thin SiO 2 films plasma deposited on modified PC substrates, while the treatments with pure oxygen or Ar/ethanol plasma had negative effect on the adhesion.