fig1

Figure 1. Preparation and physical characterization of separators. (A) Fabrication process of PEI-EDA separator; (B) Rolls of the PEI-EDA separator; (C) SEM morphology images of PEI-EDA separator; (D) FT-IR spectra of PEI and PEI-EDA separators; (E) Strain-stress behavior of the PEI and PEI-EDA separators; (F) Burning images; (G) Photos of separators after different temperature heat treatment for 30 min; (H) DSC analysis. PEI-EDA: Ethylenediamine grafting polyetherimide; PEI: polyetherimide; SEM: scanning electron microscopy; FT-IR: fourier transform infrared; DMAc: N, N-dimethylacetamide; PP: polypropylene.