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A linear aliphatic diamine, ethylenediamine (EDA), for the first time, was used to cross-link polyimides and the EDA modified polyimides were further thermally treated at different conditions to enhance anti-plasticization characteristics. The physicochemical properties of unmodified and modified polyimides were characterized by XPS, FTIR–ATR, DSC, UV and XRD. The results of XPS and FTIR–ATR show...
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