Article ID | Journal | Published Year | Pages | File Type |
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634899 | Journal of Membrane Science | 2012 | 9 Pages |
Positron annihilation lifetime spectroscopy (PALS) and molecular dynamics (MD) simulation analyses were adopted for an in-depth understanding at the molecular scale of the variation in the fine-structure of polyamide active layers of thin-film composite (TFC) membranes in the dry or the wet condition. The interfacial polymerization reaction between 1,3-diaminopropane (DAPE) and succinyl chloride (SCC) or between DAPE and trans-3,6-endomethylene-1,2,3,6-tetrahydrophthaloyl chloride (tNBDC) on the surface of a modified polyacrylonitrile (mPAN) membrane was carried out to fabricate DAPE-SCC/mPAN or DAPE-tNBDC/mPAN TFC membranes. PALS and MD simulation experimental results were highly consistent with each other.
Graphical AbstractThree-dimensional representation of fractional accessible volume in DAPE-SCC (a, b) and DAPE-tNBDC (c, d) polyamide active layers: (a, c) dry state, (b, d) wet state. (Probe radius was set as 0.8 Å). Figure optionsDownload full-size imageDownload high-quality image (203 K)Download as PowerPoint slideHighlights► Microstructure variation of different polyamide active layers was discussed. ► Swelling effect associated with the pervaporation process was investigated. ► PAS and MD techniques showed good correlation with the pervaporation performance.