摘要 : In order to improve the energy storage performance of nanocomposite capacitors, barium titanate (BaTiO3) nanoparticles are usually surface-modified with multiple coupling agents to improve their compatibility with poly(vinylidene ... 展开 In order to improve the energy storage performance of nanocomposite capacitors, barium titanate (BaTiO3) nanoparticles are usually surface-modified with multiple coupling agents to improve their compatibility with poly(vinylidene fluoride - hexafluoropropylene) [P(VDF - HFP)] and Polymethyl Methacrylate (PMMA) matrix. Therefore, exploring suitable coupling agent is urgent for high-performance composite films. In this work, the coupling mechanism and interfacial interactions among coupling agents, BaTiO3, and P(VDF - HFP)/PMMA are theoretically investigated. Compared with other coupling agents in this work, Tween 20 (TW20) can reinforce the Van der Waals force and chain entanglement between BaTiO3 nanoparticles and P(VDF - HFP)/PMMA due to the longer chain segments. Therefore, TW20 can enhance the dispersibility of BaTiO3 fillers and improve the compatibility between BaTiO3 and P(VDF - HFP)/PMMA. Owing to the excellent uniformity and compactness, TW20 modified BaTiO3/P(VDF - HFP)&PMMA nanocomposite films exhibit the excellent discharge energy density of 14.4 J cm(-3) and efficiency of 77.3% at 557 kV mm(-1), which is 3 times higher than that of unmodified BaTiO3/P(VDF - HFP)&PMMA nanocomposite films. This study declares that optimizing coupling agent can boost the energy storage density of nanocomposites films. 收起