SEC calibration standards
Kits with different molecular weight
Product overview
Polystyrene (PS)
Organic polymer
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For organic solvent SEC (GPC)
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Less branched polystyrene with anionic polymerization
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Easily soluble in tetrahydrofuran (THF), chloroform, toluene, and o-dichlorobenzene (ODCB)
Available as three different kits for low, medium and high MW: STANDARD SL-105, SM-105, SH-75
Polymethylmethacrylate (PMMA)
Organic polymer
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For organic solvent SEC (GPC)
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Narrow molecular weight distribution range
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Easily soluble in hexafluoroisopropanol (HFIP) and dimethylformamide (DMF)
- Also usable in THF, toluene, methyl ethyl ketone, ethyl acetate, DMF, DmAc
Available as kit STANDARD M-75 with 7 different MW
Chromatographic determinations of the molecular weight (MW) properties of polymers, either in organic or aqueous phase, rely on calibration with standards of highly characterized MWs for accurate results.
Expressed simply, Size Exclusion (or Gel Permeation) Chromatography enables polymer molecules of different sizes in solution to be separated from each other, such that the large molecules elute first and small molecules elute last.
Since the molecular size in solution (hydrodynamic volume) is related to MW, a picture of the entire MW Distribution (MWD) may be obtained quickly and simply. This is in great contrast to the “absolute” techniques of MW determination which frequently could take half a day per sample to define a single average MW.
Polymer calibration standards are thus an integral part of any quantitative Size Exclusion Chromatography.
These calibration standards need to be highly characterized by as many absolute and chromatographic techniques as possible to define the MW averages and MWD. The closer the value of the MWD is to unity, the sharper will be the polymer peak and the better the material will be for a Calibration Standard.
Note: Molecular weights (Mp, Mw/Mn) of a standard kit or each single type may vary depending on production lots. Always refer to the inspection certificate.
Note: Safety Data Sheets (SDS) are available for these products.