p*****x
发帖数: 68 | 1 i made some polymer which is soluble in DMF and monomers are soluble in CH3CN,
so i tried to precipitate from CH3CN, but it seems to lose quite some material
in that process. can i decrease the loss by using more CH3CN?
i also tried to wash with CH3CN and filter, then dissolve the polymer off the
filter and pump off DMF, but since DMF is quite high boiling, it is quite
tedious.
any suggestions? | a***u
发帖数: 9 | 2 You can try distilling some DMF from the polymer solution under vacuum. If the
solution is too dilute, you may have fine powders which are extremely
diffucult to collect unless you use a very good centrifuge. Yes, getting rid
of DMF is tedious. But spending even an hour on that may save you many hours
in trying to recover the polymer. Also pouring CH3CN into DMF may give you
different result from pouring DMF into CH3CN, although I am not sure which way
is better for your experiment. In one word,
【在 p*****x 的大作中提到】
: i made some polymer which is soluble in DMF and monomers are soluble in CH3CN,
: so i tried to precipitate from CH3CN, but it seems to lose quite some material
: in that process. can i decrease the loss by using more CH3CN?
: i also tried to wash with CH3CN and filter, then dissolve the polymer off the
: filter and pump off DMF, but since DMF is quite high boiling, it is quite
: tedious.
: any suggestions?
| f***y
发帖数: 74 | 3 i think you may try some mix solvent? such as MeOH/CH3CN...
CH3CN,
material
the
【在 p*****x 的大作中提到】
: i made some polymer which is soluble in DMF and monomers are soluble in CH3CN,
: so i tried to precipitate from CH3CN, but it seems to lose quite some material
: in that process. can i decrease the loss by using more CH3CN?
: i also tried to wash with CH3CN and filter, then dissolve the polymer off the
: filter and pump off DMF, but since DMF is quite high boiling, it is quite
: tedious.
: any suggestions?
| c****n
发帖数: 134 | 4 哇,FLORY都来了!
【在 f***y 的大作中提到】
: i think you may try some mix solvent? such as MeOH/CH3CN...
:
: CH3CN,
: material
: the
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