Shodex Standard M-75_43.jpg

Polymethylmeth-acrylate (PMMA) calibration standard

Narrow MW polymer

The calibration kit for organic SEC

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Product information

The Shodex STANDARD M-75 is Polymethylmethacrylate for SEC, and it is suitable for SEC using hexafluoroisopropanol (HFIP) and dimethylformamide (DMF) solvent. Other usable solvents are tetrahydrofuran (THF), toluene, methyl ethyl ketone, ethyl acetate, DMF, and DMAc.

  • For organic solvent SEC (GPC)

  • Narrow molecular weight distribution range

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 one another, 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 Standards are thus an integral part of any quantitative Size Exclusion Chromatography. These 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.

PMMA table.jpg

Product overview

Product code
Product name
Compound
Type
Content
Molecular weights (Mp) Range*
F8604075
STANDARD M-75
Polymethylmethacrylate
Kit
0.5 g x 7 kinds
approx. 3,000 – 1,000,000

Product info