Our applied work in this area centers around the fractionation of polymers
on an industrial scale and deals with the physico-chemical background
of the formation of membranes for separation purposes.
The necessity of larger amounts of well defined polymers for basic research or
for special applications lead to the development of CPF (Continuous Polymer Fractionation)and CSF (Continuous Spin Fractionation) ,
two methods that allow the production of many kilograms of material with sufficient
molecular and/or chemical uniformity per hour in a comparatively easy manner.
The CPF works on the basis of a continuous counter-current extraction and has so far
been applied to approximately 40 different types of (soluble) polymers. The recently developed CSF uses spinning nozzles
to overcome drawbacks of the CPF that occur under certain conditions. More details
on the methods can be obtained from the sections Fractionation
In the field of polymer membranes we are presently investigating the options to
prepare cellulose membranes directly, i.e. to avoid detours via substitution and
regeneration of cellulose. Fractionation
of cellulosic materials
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