01965nas a2200253   4500008004100000022001400041245011400055210006900169260009800238300001200336490000700348520099500355653000601350653005601356653002801412653001401440653002001454100001601474700001801490700002101508700002801529700002301557856013101580       2005                        eng d  a0959-810300aSynthesis and characterization of aromatic polyamides containing an s-triazine ring with thiophenoxy linkages0 aSynthesis and characterization of aromatic polyamides containing  aTHE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLANDbJOHN WILEY & SONS LTDcMAR  a569-5750 v543 a<p>A series of aromatic polyamides containing an s-triazine ring with thiophenoxy linkages was synthesized from two new diacids, namely 2,4-bis-(4-carboxyphenoxy)-6-thiophenoxy-s-triazine and 2,4-bis-(3-carboxyphenoxy)-6-thiophenoxy-s-triazine, and commercially available aromatic diamines by using Yamazaki's phosphorylation reaction. The polyamides were obtained in good yields and were characterized by solubility tests, viscosity measurements, FTIR, H-1 and C-13 NMR spectroscopy, X-ray diffraction studies and thermogravimetric analysis. The polyamides were found to have inherent viscosities in the range of 0.35 to 0.56 dl g(-1) in N,N-dimethylacetamide (DMAc) at 30 +/- 0.1 degreesC. All the polyamides were readily soluble in solvents such as DMAc, N-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF) and m-cresol. Thermogravimetric analysis of the polyamides indicated no weight loss below 345 degreesC under a nitrogen atmosphere. (C) 2004 Society of Chemical Industry.</p>10a210a4-bis-(3/4-carboxyphenoxy)-6-thiophenoxy-s-triazine10adirect polycondensation10apolyamide10as-triazine ring1 aPal, R., R.1 aPatil, P., S.1 aSalunkhe, M., M.1 aMaldar, Noormahamad, N.1 aWadgaonkar, P., P.  uhttps://library.ncl.res.in/content/synthesis-and-characterization-aromatic-polyamides-containing-s-triazine-ring-thiophenoxy-002400nas a2200265   4500008004100000022001400041245012200055210006900177260000800246300001400254490000700268520148900275653001701764653003801781653002001819653001401839653003901853653001501892653001801907100002201925700001901947700002101966700002301987856012402010       2025                        eng d  a1944-824400aHighly permselective contorted polyamide desalination membranes with enhanced free volume fabricated by mLbL assembly0 aHighly permselective contorted polyamide desalination membranes   cJAN  a9716-97270 v173 a<p>
	The permeability-selectivity trade-off in polymeric desalination membranes limits the efficiency and increases the costs of reverse osmosis and nanofiltration systems. Ultrathin contorted polyamide films with enhanced free volume demonstrate an impressive 8-fold increase in water permeance while maintaining equivalent salt rejection compared to conventional polyamide membranes made with m-phenylenediamine and trimesoyl chloride monomers. The solution-based molecular layer-by-layer (mLbL) deposition technique employed for membrane fabrication sequentially reacts a shape-persistent contorted diamine monomer with a trimesoyl chloride monomer, forming highly cross-linked, dense polyamide networks while avoiding the kinetic and mass transfer limitations of traditional interfacial polymerization. The mLbL process allows precise nanoscale control over polyamide selective layer thickness, network structure, and surface roughness. The resulting controlled film thicknesses enable direct measurements of water and NaCl permeabilities. The permselectivities of contorted polyamide membranes surpass those of commercial desalination membranes and approach the reported polyamide upper bound. Solution-diffusion transport modeling indicates that this high permselectivity may be attributed to enhanced water transport pathways in the contorted polyamides that increase water diffusivity-permeability while maintaining high solute rejection through solubility-selectivity.</p>
10aDesalination10amolecular layer-by-layer assembly10apermselectivity10apolyamide10apolymers of intrinsicmicroporosity10atriptycene10aTroger's base1 aShaligram, Sayali1 aShevate, Rahul1 aPaul, Siddhartha1 aShaffer, Devin, L.  uhttps://library.ncl.res.in/content/highly-permselective-contorted-polyamide-desalination-membranes-enhanced-free-volume