Microporous membranes prepared from blends of polysulfone and sulfonated poly(2,6‐dimethyl‐1,4‐phenylene oxide)

Abstract

ABSTRACT:Membranes were prepared from solutions containing Udel-type polysulfone (PSf) and sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO). Polymer solutions in 1-methyl-2-pyrrolidone were cast on a nonwoven textile and precipitated in a water bath. The permeabilities and selectivities of the prepared membranes depended on the concentrations of both polymers in the casting solution. The higher the concentration of PSf, the lower were the permeabilities to water and average pore sizes of the membranes. On the other hand, a very small amount of SPPO in the casting solution (about 1-4 wt % relative to the casting solution weight) brought about a considerable increase in water permeabilities and had a small influence on the average pore sizes. The effects were most pronounced if SPPO with a degree of sulfonation of 20 -40% was used. The considerable increase in water permeabilities was explained by separation of the PSf and SPPO phases during precipitation in water and by the concentration of hydrophilic SPPO on the surface of the membrane and its pores. The determinations of the oriented concentration potentials proved the presence of a negative surface charge in the membranes.

Preparation of sulfonated crosslinked poly(2,6‐dimethyl‐1,4‐phenylene oxide) membranes for direct methanol fuel cells by using electron beam irradiation

“…Poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) is a well‐known engineering thermoplastic that has excellent thermal and mechanical properties, good electrical characteristics, good film formability, and high oxidation resistance 9. PPO can be modified by various chemical reactions including bromination, carboxylation, sulfonation, and acylation.…”

Synthesis and Characterization of Sulfonated Poly‐(styrene‐co‐acrylic acid) for Applications as Pronton Exchange Membranes

“…These polymers usually show good thermal and mechanical properties, and they have reported that a wide spectrum of characteristics can be obtained by balancing the various groups . Moreover, these polymers are of increasing technological importance: in particular, poly(arylene ether sulfone)s (PAES)s have importance and are used in many fields, for instance as adhesives for metal‐to‐metal bonds, as membranes in the separation of gases and solids from solutions, as membranes for ultrafiltration and pervaporation or electrodialysis and, recently also, as toughening agents for brittle thermosets …”

Effect of Compatibility of PVC/P2 Alloy System on Membrane Structure and Performance

“…In the 1980s, Kesting et al did systematic research on blending systems of CA and Nylon RO membranes8–10 and obtained important results. During the past two decades, studies on novel alloy membrane systems have been widespread,11–20 all of them indicating that alloy membranes provide a very effective and promising approach to modifying both the chemical and the physical structure of membranes, as well as controlling membrane performance. Consequently, many membrane properties can now be significantly improved, including permeability, selectivity, hydrophilicity, fouling resistance, bacteriological resistance, and mechanical strength.…”