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joe_aldehyde
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[*] posted on 18-10-2005 at 12:01
aged formaldehyde soln. precipitate

is the white precipitate in the bottle paraformaldehyde? what would be the best way to depolymerize it? i fuckin googled it but there were mostly abstracts of papers giving no details of their "superior" methods.
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S.C. Wack
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[*] posted on 18-10-2005 at 13:46


I've never heard of it becoming anything else, which dissolves on reflux with water. Was this stabilized with CH3OH?



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joe_aldehyde
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[*] posted on 18-10-2005 at 21:15


it contains 10% methanol.
i thought that depolymerization of paraformaldehyde needed at least a tiny bit of OH- ions as catalyst, no?
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[*] posted on 2-11-2005 at 09:16


http://publish.uwo.ca/~jkiernan/formglut.htm

Don't know what it is myself, but this site reckons OH ions and heating at about 60 Degrees for the depolymerization. Any help?
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FriendlyFinger
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[*] posted on 2-11-2005 at 17:58


Joe, There is a thread at synthetikal on depolymerisation of paraformaldehyde.
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[*] posted on 3-11-2005 at 02:47
UREA FORMALDEHYDE

I have a solution of Urea Formaldehyde polymer in water (there may be some surfactants and stabilizers as it is an industrial product). After about 4-5 months (beyond its use by date) it sets to a rubbery gel (leave it for longer and it becomes solid) - this is obviously the polymer cross-linking, turning the stuff into something that I suppose is a bit like bakelite (phenol formaldehyde). Is there any way to reverse the cross-linking here to 'de-set' the stuff if I catch it early enough??

My guess is - probably not as I don't think it can be done with bakelite, but what about the urea formaldehyde?


Cheers.
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