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Polymer Science synthesis and characterization
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This documents includes the detailed explanation regrading the separation and purification of polymers and mechanisms of cationic and anionic polymerization
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ISOLATION AND PURIFICATION OF POLYMERSare some of the methods available for
We know that solution, emulsion or suspension techniques
be contaminated with the monomer
preparing a polymer. Polymers formed will as such, however,
emulsifier, etc., and hence, need to be isolated and purified.
initiator, solvent,
acquiringa
monomer-solvent mixture after
Some polymers precipitate out of the monomer or
obtained as fine powder. Polymers produced
particular molecular weight and hence, are straightaway
form of solid beads. Both these types of polymers
can
the method obtained in the
by suspension are
order to
several times with water or suitable non-solvents in
and washed
De tiltered or centrifuged
free them from the contaminants.
is obtained as a solution either in the
the polymer
t n e case
of bulk or solution polymerisation, can be done by precipitating
the polymer using a
O m e r or the solvent. Purification in these cases
concentration and
solution is diluted to 2% to 5%
polymer
30vent. To get the best results, the under vigorous stirring.
One important point
thin stream to a large yolume of non-solvent solvent and the
miscible both with the
4
t non-solyent should be freely the
hoted here is that the solutions are poured into
of the polymer,
n As increasing quantities
all proportions. and reduces the
non-solvent slowly
hon solution mixes with the taken, the solvent
the solvent from the non-solvent is not
Dreni t, quantity of
If a sufficient
precipitating power of the
may completely:
non-solvent.
non-solvent power at
some stage and no morepolymer would precipitate
non-solvent. A list of
suitable
nullify the of the
out of the y for taking a large quantity
Table 13.1.
soluuion; hence the need is given in
solvents
Solvente
o n - s o l v e n t s for
s o m e important
polymers
non-solvent, the
polymer separates
out as solid lumps.
of the polymer.
On pr p l t a t i o n from the
solution with a
of times will
improve the purity
Redissolvinga "6 dnd reprecipitating
the polymer
a couple
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