Controllable modification of polymer membranes by long-distance and dynamic low-temperature plasma flow: AA grafting penetrated through electrospun PP fibrous membranes

Morphological and hydrophobic modifications of PVDF flat membrane with silane coupling agent grafting via plasma flow for VMD of ethanol–water mixture

“…So far, plasma treatment in membranes has been mostly focused on improving the hydrophilicity of the membrane for better fouling resistance [24][25][26]. Only a few studies have explored the hydrophobicity modification via plasma treatment [27][28][29].…”

“…In our previous works [25,26,30,31], we systematically studied the effects of plasma treatment time, plasma power, gas flow rate and chamber pressure on the membrane surfaces by detecting the etching and peroxide content formed on the flat PP fibril membranes after Ar long-distance and dynamic low-temperature (LDDLT) plasma flow treatment. In this kind of plasma flow, free-radicals lead the treatment.…”

Switchable hydrophobic/hydrophilic surface of electrospun poly (l-lactide) membranes obtained by CF4 microwave plasma treatment

“…Figure 7 and Table 3 show C 1s peaks of the PLLA samples before and after CF 4 plasma treatment. The spectrum from the untreated PLLA shows three components at 285, 287 and 289 eV, which may be assigned to the presence of C-C, C-O and O=C-O bonds in chain [9,12,22]. After CF 4 plasma treatment, the C1s spectra revealed new peaks at 292 and 294 eV, corresponding to the CF 2 -CF 2 and CF 3 [49], which were not observed for the untreated PLLA.…”

“…This method provides a wide range of surface functionalities [9,12,13,[19][20][21], which can change the surface wettability of the materials in the nanometer scale, without affecting the bulk properties, and it has been widely used in membrane surface modification. For instance, surface modification by reactive gas plasma treatment or plasma-assisted film deposition or polymer coating by using various extracellular matrixes and other active molecules via plasma treatment have been shown to improve the surface wettability of polymer materials [12,16,[22][23][24].…”

“…Most of studies focus on the application of plasma treatment for one-way regulation in enhancing the surface wettability. However, the interactions between the plasma and the surface molecules of polymers would lead to both physical etching [39][40][41][42][43][44] and chemical grafting effects [12,22], so it's feasible to control the surface wettability of polymers by single plasma treatment.…”