NDLI: Relationship of relaxation property to reverse osmosis permeability in aromatic polyamide thin-film-composite membranes

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Relationship of relaxation property to reverse osmosis permeability in aromatic polyamide thin-film-composite membranes

Content Provider	Semantic Scholar
Author	Kwak, Seung-Yeop
Copyright Year	1999
Abstract	We proposed a new approach to characterize the reverse osmosis (RO) permeability in conjunction with the macromolecular structures and inherent polymer properties for crosslinked and linear model aromatic polyamides. Aromatic polyamides were synthesized via interfacial reaction of phenylene diamines (p- and m-phenylene diamines) with either tri-functional (trimesoyl chloride) or di-functional (terephthaloyl and isophthaloyl chlorides) acyl halides.The relaxation properties obtained by cross polarization/magic angle spinning (CP/MAS) 13C NMR spectroscopy, in conjunction with the chemical structures, built a bridge between the specific polymer properties and the RO performance of the aromatic polyamides. The spin-lattice relaxation time in the rotating frame, T1ρ and hence chain mobility seemed to be an important parameter to control the RO membrane permeability. The longer T1ρ resulted from the crosslinked aromatic polyamides, in which presence of the crosslinking retarded local polymer motion, and a lower water flux resulted. In contrast, the shorter T1ρ for the linear crosslinked polyamides played a significant role for the higher water flux.
Starting Page	6361
Ending Page	6368
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1016/S0032-3861(98)00842-8
Alternate Webpage(s)	http://hosting03.snu.ac.kr/~eco/file/20.pdf
Alternate Webpage(s)	https://doi.org/10.1016/S0032-3861%2898%2900842-8
Volume Number	40
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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