Glow discharge polymerization, schematic

Figure 13.1 Schematic diagrams of the two configurations of the electrode setup used in the glow discharge polymerization process, (a) A1 substrate was used as powered electrode and (b) A1 substrate was floating in between the two parallel electrodes.

Schematic representation of the mechanism of glow discharge polymerization [458].

The plasma polymerization reactor used is schematically shown in Figure 5.5. Parallel electrodes, equipped with magnetic enhancement, by a 10-kHz power source created glow discharge of the monomer. A thickness monitor sensor is placed at the projected circumference of electrodes intercepting the midelectrode plane. The electrodes are 13.2 cm in diameter and 6.1cm apart. The thickness monitor surface is perpendicular to the plane parallel to the electrodes. 

Glow-Discharge Treatment. HMDS was deposited by plasma polymerization on the PC membranes in a glow-discharge reactor system shown schematically in Figure 2. The reactor was a glass tube (inner diameter 6.4 cm and length 35 cm) with two copper electrodes (surface area of each electrode 140 cm ) mounted on the outside. 

A plasma is an excited gas which consists of atoms, molecules, ions, free radicals, free electrons and metastable species and the use of plasmas to pretreat polymers (and metals, as discussed later) has been known for about 20 years. The plasma may typically be generated in air, termed a corona discharge, or under reduced pressure, termed a glow discharge . Also, the gas may be non-polymerizable or be able to polymerize and deposit onto the substrate surface. A schematic representation [79,80] of the numerous interactions which are possible in a gas plasma impinging upon a substrate is illustrated in Fig. 4.11. 

---