I synthesized polyethylene glycol. I need to remove moisture from the polymer. T tried freeze drying but it didn't work please suggest me some other method which removes moisture.
Thanking You in advance...
Dear all,
use an azeotrope solvent such as dry benzene or toluene, after that proceed with simple Dean-Stark distillation or soxhlet extraction. Regards
Crown ethers are small polyethers. The signalled discussion, possibly inspiring for comparable polyethers, specifically addresses the dehydration of the 18-crown-6 (1,4,7,10,13,16-hexaoxacyclooctadecane) crown ether: https://www.researchgate.net/post/I_want_to_remove_moisture_from_the_18-crown-6_crown_ether_Can_anyone_help_me_with_the_drying_process
In case you want to consider aqueous two-phase systems including polyethylene glycol (PEG), which may allow to partially exsolve water from the PEG-rich phase (possibly by exploiting the salting-out effect), while further concentrating that same phase; you may find particularly useful refer to: Boris Y. Zaslavsky, "Aqueous Two-Phase Partitioning ─ Physical Chemistry and Bioanalytical Applications", Marcel Dekker, New York, 1995.
Besides considering the salting-out effect, mentioned at my first post to this query, it would be also possible to assist the phase separation of a prior PEG aqueous solution, while promoting the extraction of PEG to a second phase by adding another PEG-solvent (extractant) slightly soluble in water, such as (e.g.) tert-amyl alcohol. Such liquid-liquid extraction, which may be reinforced by successive extractions, can also be complementarily assisted by adding also a salt, thus by the above mentioned salting-out effect.
Hi Kishore, to remove moisture traces you can use 2,2-Dimethoxypropane. It reacts with water forming acetone and methanol. I use it for drying normal phase solvents and it works fine. Greetings Markus
Also on drying polyethylene glycol (PEG) at this forum: https://www.researchgate.net/post/Is_polyethylene_glycol_PEG_hygroscopic
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