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