HT-GPC or HT-SEC is employed to determine of the average molecular weight (Mn and Mw) and the polydispersity index (Mw/Mn) of highly crystalline polymers which show low solubilities in common organic solvents at ambient temperature.
Therefore, HT-SEC is routinely applied to polyolefins including polyethylenes (HDPE, LDPE, and LLDPE), polypropylene (PP), ethylene-Propylene (EP) copolymers, poly(ethylene-vinyl acetate) (EVA) and poly(ethylene-butyl acrylate) (EBA)).
Measurements are carried out in 1,2,4-trichlorobenzene (TCB) at 160 °C.
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