Polyaramide hollow fibers for hydrogen/methane separation — spinning and properties

Insights into the Chain and Local Mobility of Some Aromatic Polyamides and Their Influence on the Physicochemical Properties

“…Until now, aromatic polyamides have not received a special attention as membrane‐forming materials, and relatively few studies have been reported on the permeation properties of aromatic polyamides …”

A novel approach to fabricate macrovoid‐free and highly permeable PVDF hollow fiber membranes for membrane distillation

“…N¼ fiber wall thickness=fiber ID (2) As a rule of thumb for high pressure driven applications such as gas separations, N ¼ 0.5 has been suggested by Ekinner et al 7 However, in an MD process in which almost atmospheric pressures are applied, N values as low as N ¼ 0.1 or less might be applicable as well. This translates into the applicability of a fiber with a small wall thickness as low as 100 lm at the same time, a big fiber ID as high as 1000 lm.…”

Effect of substituents on the permeation properties of polyamide membranes

“…Technical aromatic polyamides have achieved significant importance as high performance materials, thanks to their excellent balance of mechanical and thermal properties [6][7][8]. However, they have not deserved special attention as membrane-forming materials, so that rather few studies have been reported on the permeation properties of aromatic polyamides (APAs), either in scientific journals [9][10][11] or in the patents literature [12][13][14]. On the other hand, commercial APAs are very difficult to process, as they do not melt, and they are insoluble or very poorly soluble in highly polar organic solvents.…”