Polymers
Soft polymers wet UiO-66 without interfacial voids
Open access · cc by · source: Europe PMC
MD shows flexible PVDF and PEG fill UiO-66 surface pockets; rigid PIM-1 and PS leave microvoids and fail as 70 wt% films.
How this study connects
Role on claims
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MD shows flexible PVDF and PEG fill UiO-66 surface pockets; rigid PIM-1 and PS leave microvoids and fail as 70 wt% films.
Evidence for the claim as stated.
Study at a glance
- Design
- Computational / modelling — MD of polymer interfaces on a hydrated UiO-66 slab plus 70–80 wt% mixed-matrix films
- N
- PIM-1, PS, PVDF, and PEG against {101} UiO-66; experimental films at high filler loading
- Population
- MOF/polymer mixed-matrix membrane interfaces
- Outcome
- Flexible PVDF and PEG fill UiO-66 surface pockets; rigid PIM-1 and PS leave microvoids and fail as high-loading films
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Soft polymers wet UiO-66 without interfacial voids
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
The MOF powder has a BET area of 1380 ± 60 m2 g–1.
yielding 200 nm truncated octahedral particles (Fig. S17) with the expected powder X-ray diffraction pattern (Fig. S18) and a BET area of 1380 ± 60 m 2 g –1 (Table S7, Fig. S19).
z-length A is 15 ± 3 Å for the PIM-1 composite versus 6 ± 1 Å for PVDF.
the affinity of UiO-66 for PVDF (6 ± 1 Å) is higher when compared to PIM-1 (15 ± 3 Å) and PS (9 ± 2 Å), respectively.
Key findings
PIM-1/PS interfaces have microvoids (up to 13 Å and 8 Å) and long recovery distances (z-length A 15 and 9 Å). PVDF and PEG show no voids, chain-end pore penetration, and H-bonds at 2.0 vs 1.7 Å. PEG Young's modulus more than doubles at 70 wt% MOF, but N2 area collapses; PVDF keeps MOF porosity.
Methodology
Authors built a hydrated {101} UiO-66 slab, equilibrated PIM-1, PS, PVDF and PEG against it, and made 70–80 wt% PEG MMMs compared with PVDF, PS and PIM-1 films.
Limitations
No gas-separation permeance on the new PEG MMMs; PEG pore blocking is inferred from BET, not in situ pore tomography; only one MOF topology was modelled.
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