Remote Surface Modification of Plastics by Atmospheric Barrier Discharge

Abstract

The surface modification by atmospheric pressure barrier discharge is effective in the improvement of adhesion performance of plastics. Remote plasma processing has several advantages over direct plasma processing. It is free from the problem of surface damage and charge accumulation and has larger freedom of setup of the system. However, it is necessary to improve the processing performances such as range of remote processing distance, reduction of contact angle, and so on.In this paper, we have investigated processing performances of the remote surface reforming. We used polyethylene film as the reforming object. It was found that the following are very effective as processing conditions: (1) use of nitrogen gas, (2) high-speed gas flow, and (3) longer processing time.

Controllable modification of polymer membranes by long-distance and dynamic low-temperature plasma flow: Treatment of PE hollow fiber membranes in a module scale

“…3(a), the distance of the first region increased from about 4 to 10.5 cm with increasing the discharge power from 20 to 80 W. It is generally accepted that the amount of radicals generated is proportional to the discharge power [28]. Therefore, increasing the discharge power could improve the effective distance.…”

“…In this experiment system, as shown in Fig. 2, the distance between plasma zone (0 cm) [28] and the module inlet was adjusted to 5-6 cm. To assess the modification results by LDDLTP, the system was vacuumed and Ar was introduced.…”

“…The contact angles decreased rapidly from about 831 to 601 with increasing the time from 30 to 120 s. After about 120 s, the contact angles were not adversely affected by prolonged exposure to the plasma continuously. It is inferred that the surface reforming by Ar plasma had reach a saturated level within 120 s. Surface reforming became more effective for a longer exposure to plasmas, because the amount of radicals reacting with the membrane surface increase in proportion to the exposure time [28]. However, the tensile strength of the hollow fibers decreased greatly when prolonged the exposure time [8].…”

Generation of microwave-excited atmospheric-pressure line plasma and its application

“…Research on atmospheric-pressure plasma treatment has been under way to improve the surface cleaning ability and adhesive property of glass plates used in flat-panel displays, [1][2][3][4] semiconductor substrates, [5][6][7] and polymer films. [8][9][10] Various types of atmospheric-pressure plasma, such as the plasma generated by dielectric barrierdischarge [11][12][13][14][15] or corona discharge, 16) the remote plasma obtained by ejecting the plasma generated between electrodes into an environment by gas flow, 17) and the microwave-excited plasma, [18][19][20][21] have been reported. Atmospheric-pressure plasma treatment enables low-cost and high-speed processing because no vacuum equipment is required and continuous processing is possible.…”

Study on surface modification of the L-lactic acid films using microplasma

“…For the microplasma treatment of polymer sheet, the treatment area was wider then the case when corona discharge or plasma jet were used. E x i t e d s p e c i e s , radicals (OH) and ions generated by microplasma using process gases (Ar, N 2 , Air) collided with the surface of polymer sheet [2]. The chemical bonds on the surface polymer sheet were changed due to the action of excited species, radicals and ions.…”