Swelling of Ultrathin Molecular Layer-by-Layer Polyamide Water Desalination Membranes
- Swelling of Ultrathin Molecular Layer-by-Layer Polyamide Water Desalination Membranes
- Edwin P. Chan; Allison P. Young; 이정현; Christopher M. Stafford
- Desalination membrane; Swelling; Molecular Layer-by-Layer; Thin films; membranes; networks; polyamides; X-ray
- Issue Date
- Journal of polymer science Part B, Polymer physics
- VOL 51, NO 22, 1647-1655
- The water vapor swelling behavior of ultrathin crosslinked
aromatic polyamide (PA) films, synthesized via molecular
layer-by-layer deposition, is characterized via specular X-ray
reflectivity. The results show that these films expand only along
the thickness direction and their maximum swelling ratio can be
controlled by the specific diamine monomer chemistry. By
measuring the swelling ratio as a function of water activity, the
Flory interaction parameter and monomers between crosslinks
of these PAs are characterized using the Flory-Rehner and the
Painter-Shenoy thermodynamic swelling models. Comparing
the monomers between crosslink calculated from the swelling
theories with values obtain from chemical analysis indicate that
the PS model gives a more accurate description of the PA networks.
This suggests that these low functionality but highly
crosslinked networks swell via a combination of chain expansion
and topological rearrangement.
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