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| Links to manufacturers of polymer
standard & SEC columns, application notes and other resources
on the web concerning polymer analysis. Enjoy! |
| Tips: Calibration curve [1] |
|
The calibration curve should cover the MW range of the polymer
samples of interest. At least two calibration points must be
measured per decade of MW and there must be at least five
calibration points altogether.
If PS is used as the calibration standard, n-hexylbenzene (M=162)
can be used as the standard with the lowest MW on the calibration
curve, because most PS standards are manufactured by anionically
initiated polymerization and have a n-butyl group at one end.
The concentrations of the PS standards should preferably be
one-half of te sample concentration.
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| Characterization: Commercial LC-FTIR interfaces |
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| Tips: Sample and Calibration
concentrations [1] |
As a rule of thumb, the concentration levels for samples and PS
standards are presented in the table below.
| Sample/Standard |
MW-range |
c |
| Sample (%(w/v)) |
>
10E6 |
~0.05 |
|
high
MW |
<
0.1 |
|
low
MW |
0.1-0.2 |
| PS standards
(%(w/v)) |
>
10E6 |
<0.025 |
|
10E5-10E6 |
<0.05 |
|
<10E5 |
<
0.1 |
| PS standards (expressed |
>
10E6 |
1/8-1/10 |
| as fraction of
sample |
5x10E5-10E6 |
1/4-1/5 |
| concentration) |
<10E5 |
1/2 |
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