RETRACTED: Investigation of structure‐performance properties of a special type of polysulfone blended membranes

Abstract

Membranes require superior mechanical strength due to applied harsh conditions. The mechanical properties of membranes decrease with increasing hydrophilicity of its elements. In this study, mechanical properties were investigated for two special blended membranes which were made by blending polysulfone with (polysulfone-gpoly (n-butylacrylate) and polysulfone-g-poly (tert-butylacrylate) as components. All of the prepared membranes were characterized by differential scanning calorimeter, thermal gravimetric analysis, field emission scanning electron microscope, and atomic electron microscope and were investigated in terms of pure water flux, water contact angle, molecular weight cut off, and morphology. It was found that water contact angle decreased from 73.6°which belongs to neat membrane decreased to 46°for blended membranes containing higher amounts of copolymers; however, the pure water flux increased with increasing copolymer content considerably compared with the neat membrane. Also, molecular weight cut off increased aggressively. Furthermore, mechanical properties including tensile strength, Young modulus, and elongation at break were measured and compared with the neat polysulfone membrane.Results showed that the tensile strength and modulus decreased with an increase in the copolymers content, despite the increase in the elongation at break. The effect of applied pressure on the membrane structure and also bursting strength were studied, and it has been proved that not only the structure of the membranes but also their performance is strongly affected by the composition of the membranes.

Cannabinoids and Terpenes as an Antibacterial and Antibiofouling Promotor for PES Water Filtration Membranes

“…Results of the Young's modulus, maximum stress, and maximum strain are provided in Table 2 where the Young's modulus, stress, and strain results showed the minimum value of Young's modulus for the CT-PES membrane, followed by the C-PES, T-PES, and pure PES membranes ( Figure S3). Similar results of a decrease in the Young's modulus on the introduction of hydrophilic additives have also been observed in previous studies [25,26]. Reduction in tensile stress as well as Young s modulus was related to the alteration in the structure of the membrane upon introducing phytochemicals.…”

Graphene oxide grafted poly(acrylic acid) synthesized via surface initiated RAFT as a pH‐responsive additive for mixed matrix membrane

“…Observed cracks in the images created probably due to electron radiation, however, surface roughness increased by the addition of the GO‐PAA. The FESEM images show an increase in surface roughness in qualitative terms, while roughness increasing in the membrane surface with a rise in hydrophilicity has been quantitatively proven in similar works …”

“…The FESEM images show an increase in surface roughness in qualitative terms, while roughness increasing in the membrane surface with a rise in hydrophilicity has been quantitatively proven in similar works. 40 In the cross-sectional images of the membranes (Figure 7), two completely different structures, which were formed during the phase inversion process, can be observed, as well as a thin dense layer that is detectable on the porous mass. 41 Porous layer in neat membrane had finger-like macrovoid structure, 42 while in modified membranes with GO-PAA, it had a much larger macrovoid structure.…”

Choice of Apposite Dispersing Medium for Silica Nanoparticles Leading to Their Effective Embedment in Nanocomposite Nanofiltration Membranes

“…This assumption was made: the amount of PSf in all membranes was similar. TFC exhibited two degradation temperatures: 400 °C (polyamide degradation) and 515 °C (PSf degradation). , TFN-A showed degradation temperatures similar to those for TFC. For TFN-O, however, degradation that began at 200 °C was ascribed to the OH groups of silica .…”