F R A U N H O F E R I N S T I T U T E F O R A P P L I E D P O LY M E R R E S E A R C H I A P
Extinction [222 nm]
Extinction [268 nm]
0.4
0.03
180 min
120 min
90 min
60 min
30 min
0.3
90 min
60 min
30 min
15 min
0.02
0.2
0.01
0.1
1
0
20
25
30
35
2
40
0
20
25
30
35
Volume [mL]
1 SEC elugram for the graft polymerization
of a transfer active monomer onto starch;
Detection at 222 nm.
2 SEC elugram for the graft polymerization
of a transfer inactive monomer onto starch;
40
Volume [mL]
GRAFT COPOLYMERIZATION
OF CATIONIC MONOMERS
ONTO STARCH
Detection at 268 nm
For the first time, cationic graft copolymers­
Transfer inactive monomers, on the other
of starch were synthesized by means of a
side, result exclusively in graft-polymers
­novel radical graft process (PCT / EP02 /­07829)
whose average molar mass increases with
without the unwanted formation of homo-
the time of reaction. The elugrams shows
polymer. Basic requirement was the choice
only one peak exhibiting again a distinct
of adequate graft monomers.
shift of the peak maximum (Fig. 2).
Process and products have been analytically
Fraunhofer Institute for
controlled by SEC by means of graft mono-
Applied Polymer Research IAP
mers, which can be selectively UV-detected
in the grafted chain and the homo-polymer
Science Park Potsdam-Golm
compared to the starch substrate.
Geiselbergstr. 69
14476 Potsdam-Golm
Transfer active monomers always result
in bimodal mass distributions suggesting
Contact
the formation of graft- as well as homopolymer (Fig. 1).
Dr. Erik Wischerhoff
Phone +49 331 568-1508
Due to the larger hydrodynamic volume
[email protected]
graft-polymers elute at smaller eluation vol-
www.iap.fraunhofer.com
Cooperations
umes than the respective homo-polymers.
Südzucker AG
With increasing reaction time due to the
FH Nürnberg / FH Lübeck
growing molar masses the peak maxima
shift to lower volumes.