How can I measure monomer conversion in emulsion polymerization? It will much be appreciated if someone provides with any article where detail is provided.
Thanks in advance,
Parijat
Dear Parijat,
An industrial favorite is to use a head space interface on a gas chromatograph (GC). The reference I give below is for the more exhaustive "multiple headspace extraction (MHE)" method, but a single headspace extraction is also done frequently in industrial labs.
https://www.perkinelmer.com/lab-solutions/resources/docs/APP_DeterminationMultiple.pdf
Perhaps see also:
https://www.ncbi.nlm.nih.gov/pubmed/22500443
Another approach using GC is a variation on Yuri's article in that you use a precipitant like methanol (depending on the polymer) to precipitate the emulsified polymer. At that point your monomer (if soluble in the precipitant) can be injected into a GC for analysis. One generally avoids injecting polymer plus monomer on the hot GC injectors because some cracking of the polymer or pyrolysis occurs which can give one false high values for residual monomer.
Best regards,
Mike Bender
Please see the following threads:
https://www.researchgate.net/post/What_is_the_best_method_to_determine_the_conversion_of_an_emulsion_polymerisation
https://www.researchgate.net/post/How_to_measure_a_percentage_conversion_of_monomer_to_polymer
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Polymers