GPC/SEC standards

Hello, i face a problem with my samples. The polystyrene and PMMA standards provided by Agilent are totally soluble in THF solvent and yield very clear and narrow peaks in the chromatogram. However, the majority of the polyesters synthesized in our laboratory are only soluble in chloroform and not in THF. Is it possible to produce a calibration curve using the PS and PMMA standards while analyzing our samples using chloform as solvent in the sample preparation?

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