There are bunch of methods established for the pore characterization, which you can chose any of them in accordance with the polymer physicochemical properities, approximate pore size, and chemicomechanical stability.
1. Gas physisorption method (BET), pore size range: 0.2 nm -100 nm
2. Mercury intrusion, pore size range: 2 nm -100 micrometer.
3. Neutron and X-ray scattering, pore size range: 01nm - 100 nm
4. Electron microscopy, pore size rang: 1 nm - 10 micrometere
5. Thermoporometry, pore size range: 1 nm - 100 nm.
6. NMR relaxometery, microscopy, and spin echo, pore size range: 1 nm to mm size.
7. Capillary flow porometry or permporometery pore size range: 1.5 nm- 100 nm.
There are bunch of methods established for the pore characterization, which you can chose any of them in accordance with the polymer physicochemical properities, approximate pore size, and chemicomechanical stability.
1. Gas physisorption method (BET), pore size range: 0.2 nm -100 nm
2. Mercury intrusion, pore size range: 2 nm -100 micrometer.
3. Neutron and X-ray scattering, pore size range: 01nm - 100 nm
4. Electron microscopy, pore size rang: 1 nm - 10 micrometere
5. Thermoporometry, pore size range: 1 nm - 100 nm.
6. NMR relaxometery, microscopy, and spin echo, pore size range: 1 nm to mm size.
7. Capillary flow porometry or permporometery pore size range: 1.5 nm- 100 nm.
Dear Luc,
May helpful for you,
https://www.researchgate.net/publication/226779696_Porosity_of_polymer_materials_by_various_techniques.
Hg and Nitrogen intrusion porosimetry tests are currently used to this purpose. To be kept in mind, your question needs some clarification on the actual substrate under test … is this a fiber based material? a membrane? bulk material?
Dear Luc,
Another way is performing X-ray micro-tomography. In your case, this will allow you obtaining 3D information on the spatial distribution and size of individual pores (above 0.4µm) in the bulk of the polymer. Then by image analysis, using ImageJ or Avizo, you can quantify any parameter you want from this data, (for instance, porosity).
Best regards
Hi Luc, you can definitely start performing Brunauer–Emmett–Teller (BET) analysis, and you could start getting into the topic through this publication: 10.1021/ja01269a023 . Then if you might want also to read this other reference 10.1016/j.memsci.2017.06.053 that I think provides an interesting perspective on the interpretation of data you get. Best.
There are many methods to determine the porosity in polymers and an appropriate method can be chosen according to the sample type and pore size.
X-ray micro tomography
Microscopy techniques
Just examples are...Chapter Porosity and Its Measurement
and http://canchemtrans.ca/uploads/journals/CCT-2016-0304.pdf
Besides the above mentioned methods you may interested in the methods explained by the following papers for the measurement of porosity:
Article Enhanced water flux through ultrafiltration polysulfone memb...
Article Molecularly imprinted ultrafiltration polysulfone membrane w...
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