Synthesis of ternary copolyamides from aromatic diamine (m-phenylenediamine, diaminodiphenylsulfone), aromatic diamine with carboxyl or sulfonic group (3,5-diaminobenzoic acid, 2,4-diaminobenzenesulfonic acid), and iso- or terephthaloyl chloride
✍ Scribed by Shigeji Konagaya; Masaya Tokai
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 152 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The copolymerization of iso-or terephthaloyl chloride, m-phenylenediamine or diaminodiphenylsulfone, and 3,5-diaminobenzoic acid or 2,4-diaminobenzene sulfonic acid (or sulfonate) was studied. Copolymers with high reduced viscosity could be obtained by low temperature solution polymerization, but not by interfacial polymerization. The reduced viscosity of the copolyamides obtained was dependent upon the species of the aromatic diamine compounds and the acid acceptors used. Low temperature solution copolymerization with the comonomer 3,5-diaminobenzoic acid should be done without acid acceptors, because acid acceptors cause gelation. With 2,4-diaminobenzenesulfonic acid or 2,4-diaminobenzenesulfonate, pyridine or triethylamine as acid acceptors give polymers with higher reduced viscosity. The flat asymmetric membranes of the copolyamides prepared from terephthaloyl dichloride and mixed diamine components of 3,3Ј-diaminodiphenylsulfone and 3,5-diaminobenzoic acid showed not only good reverse osmosis performance, but also high chlorine resistance.