Synthesis and Application of New Multibranched–Linear–Multibranched Fluorinated Copolymer as Demulsifiers for Naphthenic Compounds Stabilized Emulsion

•A series of novel fluorinated copolymer with multibranched–linear–multibranched structure were prepared.•The demulsification process of the copolymers in naphthenic acids and sodium naphthenates stabilized emulsions were evaluated.•The relationship between polymer structure and demulsification performance was discussed.