Aiming on dispersing MOF particles in a suitable polymer matrix for thermal desorption and/or preconcentration, I am looking for a polymer that fulfills the following requirements:
- soluble in organic solvents that can be removed by vacuum and elevated temperature (100-200 °C maximum). Neutral or almost neutral pH water would also be ok
- thermal stability up to 200°C and low outgassing because this is a sensing application
- macro- and/or mesoporsosity because the pore accessibility of the MOF should not be hampered too much
- good dispersion for MOF particles with 10-60µm particle diameter and bearing mostly carboxylate groups on the surface.
- Being compatible with the substrates to be finally coated on. This will be alumina, silicon or gold.
The reason for this is to have a universal method in order to fast screen MOFs for this purpose and being able to characterize the - synthesized in bulk - MOF powder prior to this dispersion.
Preliminary experiments with PMMA(996k) in THF - and afterwards added MOF powder - showed that the BET surface area was diminished but only by 20% as compared on a mass-percentage basis. Higher percentages of MOF ithin this system showed a linear increased BET surface area.
I am sure there are some polymer-heads out there who may have some interesting suggestions. I am far away from being a polymer expert.
I suppose PVDF or a copolymer such as PVDF-TRFE, but only if thermal stability refers to degradation and not to melting temperature.
Thanks! And what if the melting temperature should also be around 200°C? I forgot to mention that one.
Hi,
You can try Polyimide (PI), Poly ether ether ketone (PEEK), polysulphone (PSF), these are glassy polymers with high Tg.
Also, Rubbery polymer with low Tg you can try PDMS. It is also possible to coat a thin layer of PDMS with MOF on you desired substrate. PDMS is thermally stable up to 300 dgree C.
you can use polyurthane that is soluble in THF solvents that can be removed by vacuum and elevated temperature (100-200 °C maximum).
This paper may has some references that can help your research
Metal organic framework mixed matrix membranes for gas separations
Ryan Adamsa,
Cantwell Carsona, b,
Jason Warda,
Rina Tannenbaumb,
William Korosa, ,
Microporous and Mesoporous Materials
Volume 131, Issues 1–3, June 2010, Pages 13–20
for example: The relative ease of creating defect-free MMMs from low glass transition temperature, Tg, polymers and rubbery polymers versus higher Tg polymers is well documented [8], [36], [37], [38] and [39]. Car et al. addressed this issue by investigating PDMS-based MOF-MMMs, but the high permeabilities of gases through PDMS may have diluted the contribution of the MOFs to overall gas transport.
I hope this help you
thanks
It seems PBIs are onyl soluble in acids or DMSO. Both not my solvent of choice right now. But they seem quite robust.
Thanks for the paper up there!
any kind of acrylate and sulfoxane monomers can be useful for this work
I believe using any monomers will lead to the MOF pores being occupied by them and, finally, being blocked after their polymerization.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials Chemistry
- Polymer Chemistry