Isophthaloyl chloride copolyamides

The trimesoyl chloride could be mixed with isophthaloyl chloride to produce copolyamide barrier layers. Salt rejections toward synthetic seawater improved as the isophthalamide content of the barrier layer Increased. Surprisingly, membrane flux passed through a peak rather than simply declining as a function... 

Another copolyamide containing carboxyl groups was prepared from 3,3 -methy-lenebis (anthranilic acid) 32, m-phenylenediamine, isophthaloyl chloride and terephth-aloyl chloride 89 K The reverse osmosis membrane from this copolyamide was made by treatment with transition metals (such as NiS04), Al, or Pb and shaping. 

Very similar, wholly aromatic polyamides, with very regular structures, which reportedly result in better flexibility and higher temperature resistance, were reported. Preparation of these ordered copolyamides can be illustrated as follows. V,V-m-phenylene-bis(m-aminobenzamide) is formed first and then reacted with isophthaloyl chloride by interfacial condensation techniques to yield a product that melts at about 410 C ... 

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