Abstract
The results of investigations on new polymer materials suitable for reverse osmosis are reported. The studies particularly concerned polypiperazinamides derived from differently structured bicarboxylic acids. Such polyamides show a water permeability that may vary from 0.09 μg cm −1 sec −1 to 2.3 μg cm −1 sec −1 depending on the structure. The results obtained from reverse osmosis tests on dense and homogeneous films are described. Anisotropic membranes were prepared from poly( trans-2,5-dimethyl-piperazin-thiofurazanamide). Their properties very closely approach those of the corresponding cellulose acetate membranes. The anisotropic structure of the membranes has been evidenced by stereoscan electron microscope analysis.
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