Plasma modification of polyacrylonitrile ultrafiltration membrane

Characteristics of chitosan membranes modified by argon plasmas

“…Recently, the modification of the surface properties of membranes by plasma treatment has attracted the attention of research groups. Plasma treatments using non-polymerforming plasma gases lead to the increasing of membrane surface hydrophilicity and membrane permeability due to mainly ablationetching effects [2]. Remote and direct argon plasma causes the surface of the polymer film hydrophilic, which depends on the sample position, the RF power, and the plasma exposure time.…”

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].…”

“…Under the action of hydrogen or inert-gas plasmas, oxygen-сontaining groups are mostly formed in sites where chain cleavage forms polymer radicals which are further oxidized in air [20,21]. Treatment by a nitrogen-containing plasma (N 2 , NH 3 ) results, along with etching and polymer radical formation, in insertion of nitrogen atoms into the surface layers of membranes to form N-C bonds [39][40][41][42][43][44][45][46][47][48][49][50][51].…”

Surface modification of PAN hollow fiber membrane by chemical reaction

“…Because of its high degree of solvent resistance and good chemical and thermal stability, polyacrylonitrile has been successfully used in preparation of microfiltration and ultrafiltration membranes [4][5][6]. Moreover, because of its relatively active surface, chemical modification of PAN membrane can be easily done [7,8].…”