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Phase separation of Cu sintering pastes after 24 h with different solvent concentrations: (a) 225 mg/mL (acidic additive/solvent) and (b) 450 mg/mL (acidic additive/solvent). ① Without epoxy; ② DGEBA (Da); ③ 1,4-BDDGE (Bd); ④ glycidol (Gl); and ⑤ DGEBF (Df).
