Figure shows the wide-angle x-ray scattering (WAXS) profiles of PPCx in comparison to blank PCL37 films at room temperature. One can see multiple diffraction peaks with maximal scattering intensities at q = 1.52 and 1.68 Å -1 , indexed as ( ) and ( ) intrinsic to a orthorhombic phase of crystalline PCL, in blank PCL37 and all the PPCx films except x = 5 or 10. The WAXS profile of PPC10 films shows obvious reduced intensities of the characteristic diffraction peaks of PCL, and emergence of two relatively broad peaks around q = 0.8 and 3.6 Å -1 , respectively. Nevertheless, these two peaks, together with other characteristic peaks of crystalline PCL, all disappear in the WAXS profile of PPC5 films, with only a broad halo remaining in the region of q = 1.0-4.0 Å -1 .