Molecular Structure of Aromatic Reverse Osmosis Polyamide Barrier Layers
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Updated: Sep 21, 2025

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
Published on: April 7, 2017
Qinyi Fu1, Nisha Verma1, Hongyang Ma1,2
1Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States.
Abstract:
The molecular structures of polyamide barrier layers in reverse osmosis membranes, made by interfacial polymerization of m-phenylenediamine and trimesoyl chloride under different reaction and post-treatment conditions, were characterized by grazing incidence wide-angle X-ray scattering (GIWAXS). The molecular backbone packing is consistent with two different aromatic molecular packing motifs (parallel and perpendicular) with preferential surface-induced orientation. The results suggest that the perpendicular, T-shaped, packing motif (5 Å spacing) might be associated with optimal membrane permeance, compared with the parallel packings (3.5-4.0 Å spacings).
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