Polymer analysis by GPC-SEC

仪器资料 · 发表于 2018-6-27 17:58:38

Polymer analysis by GPC-SEC
Gel Permeation Chromatography (GPC), also referred to as Size
Exclusion Chromatography (SEC) is a mode of liquid chromatography
in which the components of a mixture are separated on the basis of
size. In GPC-SEC large molecules elute from the column first, followed
by smaller molecules. It is an important tool for the analysis of
polymers. The essential results are molecular weight data and molecular
weight distribution curves which are needed to characterize a
polymer with regard to differences in properties. GPC-SEC is mainly
used for samples with a molecular weight above 2000 although it is
also in use for oligomer separations. There is no upper limit in the
molecular weight, even polymer analyses with molecular weights of
several millions are possible. Demands on the instrumentation are
very stringent due to a special calibration procedure using a linear
elution volume on the x-axis versus a logarithmic molecular weight
on the y-axis.

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