Sulfonated polyethersulfone by heterogeneous method and its membrane performances

Abstract

Polyethersulfone was sulfonated by heterogeneous method with chlorosulfonic acid. Ion exchange capacity was controlled to 0.68 meq/g to reduce fouling. Sulfonation was confirmed by Fourier transform infrared spectroscopy and 1 H-nuclear magnetic resonance. Polyethersulfone and sulfonated polyethersulfone ultrafiltration membranes were prepared successively by the typical phase inversion method. Membrane performance of sulfonated polyethersulfone was compared with that of polyethersulfone. In the preparation of ultrafiltration membranes, the effect of the addition of dichloromethane and poly(vinyl pyrrolidone) in a casting solution was investigated on the membrane performance. It was observed that the addition of dichloromethane increased the solute rejection rate. By changing the ratio between polymer and poly-(vinyl pyrrolidone), membrane performance could be controlled. Negatively charged sulfonated polyethersulfone could reduce fouling at higher or lower pH than isoelectric point of protein bovine serum albumin.

Maximizing the Degree of Sulfonation of Polysulfone Supports in TFC Membranes for Osmotically Driven Processes

“…However, the asymmetric stretching (≈1170 cm −1 ) is hard to detect due to the presence of other overlapping peaks in that area. [36,37] ATR-FTIR spectroscopy data also confirmed the formation of the polyamide rejection layer on top of the porous supports (not reported). The thermal degradation curves of the three sulfonated polymers and that of the pristine polysulfone are reported in Figure 1b.…”

A Simple New Route to Covalent Organic/Inorganic Hybrid Proton Exchange Polymeric Membranes

“…Absorptions due to aromatic sulfonic groups are clearly observed at 1185 cm -1 (ν as -SO 3 H), 1020 cm -1 (ν sym -SO 3 H), and 965 cm -1 (δ-SO 3 H). 34 The presence of 1:2:4-substituted phenyl rings is demonstrated by the occurrence of absorptions at 1225 and 1080 cm -1 . 35 This spectrum also displays bands characteristic of aromatic sulfone moieties: 1210 cm -1 (shoulder, ν as SO 2 ), 1065 cm -1 (tail, ν s SO 2 ), and 950 cm -1 (ν s SdO), with the scissoring mode of the SO 2 group at 610 cm .…”

Synergy of supercritical CO2 and superheated H2O for enhanced processability of polyethersulfone towards open cell foams

“…PES is used in the manufacture of some parts of automotive and airplane interior. In addition, the antifouling property and chemical inertness have also afforded the use of PES as a material of choice for membranes [2] in ultrafiltration and protein purification. Despite the diverse uses, PES processing presents a major challenge as it requires high temperatures for conventional melt processing.…”

“…Ultrafiltration membranes have been traditionally prepared using phase inversion strategies such as the nonsolvent induced phase separation (NIPS) [2][3][4]. The NIPS practically involves introducing the solution of the polymer (membrane material) to a nonsolvent to allow for demixing of the polymer to form the porous membrane.…”