Ion‐plasma modification of polyvinylchloride microfiltration membranes

Abstract

ABSTRACT:Here we present how the surface and some filtration properties of PVC microfiltration membranes are affected by controlled and well-defined modification by ionplasma treatment in the kinetic region of the high voltage (HVGD) or normal glow discharge (NGD) in air. The surface energy and work of adhesion of the samples were calculated from the contact angle with both polar (H 2 O) and nonpolar (CH 2 I 2 ) liquid measurement data. The surface morphology was observed by SEM and the surface chemical composition was analyzed by ESCA. The trans-membrane water flux, the average pore size, and the pore-size distribution as well as the "bubble point" were used to control the effect of the ion-plasma treatment on the filtration properties of the PVC microfiltration membranes. Two characteristic regions of the ion-plasma treatment in air were found in our experiments where the surface properties and filtration characteristics of the membranes are extremely changed: at a pressure of 10 -15 Pa in the region of the HVGD and at a pressure of 100 -120 Pa in the region of the NGD. It was shown that the ion-plasma treatment in air is an effective technological method for regulation of some important surface and filtration properties of PVC microfiltration membranes.

Mechanical and morphological characterization of PVC plastisol composites with almond husk fillers

“…3 (particle size of 150 m). This behavior is similar across the range of plasticizer concentrations used [13,31] and in both the 500 and 1,000 m particle formulations.…”

“…Composites filled with natural fibers, moreover, have a number of advantages over composites containing inorganic fillers. Firstly, natural fibers are generally stiffer, more resistant, and less [12] dense than commonly used inorganic reinforcing fillers such as fiberglass, calcium carbonate, and mica [13][14][15]. Secondly, their availability, abundance, versatility, and recyclability [16] make them interesting candidates for low-cost filling applications.…”

Wood flour: A new filler for the rubber processing industry. III. Cure characteristics and mechanical properties of nitrile butadiene rubber compounds filled by wood flour in the presence of phenol‐formaldehyde resin

“…The modified wood flour was prepared by corona treatment in air, as described in Vladkova et al11 under the following conditions: thickness of the wood flour layer, 4 mm; voltage, 12 kV; and duration of treatment, 10 min.…”

Modification of polymer membrane properties by low-temperature plasma

“…Treatment of polymer membranes by RF (including pulsed) and microwave discharges in nonpolymerforming gases results in etching (physical sputtering or oxidation) of the polymer matrix , the rate of which depends on the nature of the plasma-forming gas. For example, the surface etching of membranes in inertgas or hydrogen plasmas by physical sputtering is inconsiderable [20,21], whereas in nitrogen, oxygen, or air plasmas the rate of etching (primarily oxidative) in analogous conditions is several times higher [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Surface etching of polymer membranes entails increased pore diameter [24][25][26][27][28][29][30].…”