Separating Poly(L-lactide-co-ε-caprolactone) and polyglycolic acid

I have a sample consisting of poly(L-lactide-co-ε-caprolactone) (PLCL), polyglycolic acid (PGA) and poloxamer 407. The only solvent that works for all three at once hexafluroroisopropanol (HFIP). Using an Agilent PLhfipgel, I am not able to achieve separation of the three components using this column. Individual injections of the raw materials show broad distributed peaks that are almost completely overlapping.

Green – PGA  Blue – PLCL Black – Poloxamer 407

Chromatogram of the sample.

The object of the analysis is to determine the molecular weights for each components separately. Any assistance would be appreciated.

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