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Project
Macromolecular
Division
WORKING PARTY ON MOLECULAR
CHARACTERIZATION OF COMMERCIAL POLYMERS
Number: 422/5/98
Title: SEC/GPC of polystyrenes
Coordinator(s): S.
Mori
Completion Date: 2001
Objective:
Obtaining accurate and precise information on the molar mass averages
by size exclusion chromatography (SEC) is important not only from
the point of view of polymer synthesis but also in industry. SEC
has a long history since it has appeared in the scientific area;
however, sometimes the values obtained by SEC have large errors,
and relative standard deviations of the molar mass averages obtained
by SEC exceed 10%. Round robin tests of several common polystyrenes
with numerous laboratories is very important to make clear the problems
concerning the SEC procedures and for future SEC standardization.
This is a RRT project with polystyrene, which is generally used
for SEC column calibration. Initially, four samples were dispatched
to 15 labs but new participants keep contacting us. The first round
is expected to be finished in the first months of 1999. Results
received so far exhibit remarkable scatter in the case of polymer
samples with a low molecular-weight tail. The PS RRT will be a very
important instrument to study the effect of standardization on the
reproducibility of data. Also some basic methodological questions
like the base line adjustement will be elucidated.
Last update: 5 August 2001
If you
want to update this information, contact us by e-mail
Do not forget to include the Project Number,
your name and relation with that project
Page last modified 29 January 2002.
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