PEDOT-PCL scaffold displayed different colors in a variety of solvents. To understand the reason behind the solvatochromism, UV-vis absorbances and fluorescence emissions of the scaffold, in different solvents, were investigated. The above experimental results indicated the formation of statistical copolymers (PEDOT-ran-PCL) consisting of EDOT chains as strong electron donating groups and ECL chains with carbonyl as electron acceptor units which can result in an intramolecular charge transfer (ICT) property with a push-pull interaction. In order to inspect ICT in detail, PEDOT-PCL's solvatochromic behavior was investigated in eight different solvents, possessing different polarity indices, i.e. dimethyl sulfoxide (DMSO), dimethyl formamide (DMF), ethanol (EtOH), acetone, tetrahydrofuran (THF), chloroform (CHCl3), dichloromethane (DCM) and toluene. While the scaffold's UV absorption didn't change significantly in different solvents (Fig. ), fluorescence emission spectra exhibited large bathochromic shifts (up to 144 nm shift) from toluene (509 nm) to DMF (653 nm) (Fig. ), indicating a well stabilized excited state through the surrounding solvents with a strong ICT behavior and larger dipole moments compared to the ground state . As previously concluded, the solvatochromism of absorption is unimportant in comparison to the bathochromic shift of the emission spectra . However, a gradual shift was not observed from polar to nonpolar solvent as expected in any positive solvatochromism. The reason for the mixed solvatochromic behavior could be the self-assembling nature of PEDOT-PCL (Fig. ), which results in specific interactions with the surrounding solvent molecules . Electroconductivities of PEDOT and PEDOT-PCL were measured using a four-point probe and calculated as 1.5 S/cm and 1.2 mS/cm, respectively. Scaffold's conductivity is higher than most of the previously fabricated PEDOT-PCL scaffolds. A drastic decrease in the electroconductivity of the scaffold, compared to that of PEDOT, is attributed to the presence of PCL units between PEDOT units. Subsequently, the electrochemical properties of PEDOT-PCL were examined by cyclic voltammetry (Fig. ). HOMO and LUMO energy levels of the scaffold were calculated as -5.31 eV and -3.79 eV, respectively. Then, the electronic band gap was determined as 1.52 eV using ECV= IHOMO-LUMOI equation. Interestingly, the band gap of PEDOT is also 1.52 eV. Cyclic voltammograms of PCL, in the literature, exhibited an irreversible oxidation peak at 1.1 V and a reduction potential at very low voltages (beyond -2.0 V). Thus, the increase in the oxidation potential and decrease in the reduction potential of the scaffold, compared to the redox potential of PEDOT, is attributed to the incorporation of PCL. The HOMO/LUMO energy levels and electronic band gap of the polymer were found to be in good agreement with the band gaps of typical p-type conjugated materials .