Figure 2.

GPC spectra of the polymers (A) and the fluorescent scanning spectra of Cy5-labeled polymers (B). Fluorescence spectra of pyrene in water-containing series of concentrations of PEG-PCL (C) and PEG-PCL-PEI (D). The CMC values of PEG-PCL (E) and PEG-PCL-PEI (F) were calculated from intersection between the fitting curves of I₃₃₈/I₃₃₃ vs concentrations and the fitting curves of fluorescence intensity vs concentrations.

Abbreviations: CMC, critical micelle concentration; Cy5, cyanine 5; dRI, differential refractive index; GPC, gel permeation chromatography; PEG-PCL, polyethyleneglycol-co-polycaprolactone; PEG-PCL-PEI, polyethyleneglycol-co-polycaprolactone-co-polyethylenimine; RFU, relative fluorescence unit.