The fully charged PBs is assembled from two blocks, in which all of the monomers in the second block carry one elementary negative charge. Thus, the electrostatic contribution in this fully charged PBs is important. Here, three fully charged PBs are studied, i.e., p = 10 and Intuitively, the predictions from PDFT are well consistent with the results of MD simulations. However, there are subtle numerical differences in the density profiles on the outer edge of the fully charged PBs. Important reasons of these deviations have been mentioned above, e.g., the lack of ion-ion electrostatic correlations in the PDFT and the differences between the two models used in PDFT and MD simulation. Here, we emphasize that despite the little differences in the density profiles of strongly charged PBs, our PDFT provides desirable accuracy and reliability in the study of interfacial microstructure of charged PBs. in SI.