具有双交联网络结构的纳米复合材料的制备及介电性能

利用官能团反应活化能的差异, 通过控制反应温度和时间制备了一种具有双交联网络结构的钛酸钡/聚芳醚酮纳米复合膜(BT-BCB/c-DPAEK). 对比研究纯聚合物薄膜及未经交联处理和仅进行单交联处理的复合薄膜发现, BT-BCB/c-DPAEK具有更加优异的力学性能和热性能, 并且其介电性能表现出良好的频率稳定性和温度稳定性. 由于双交联网络对于复合材料两相间界面的改善及高温下对聚合物分子链运动的限制, BT-BCB/c-DPAEK表现出十分优异的储能性能, 特别是在150 ℃, 300 MV/m场强下依然保持1.75 J/cm³的储能密度和80%的放电效率.

Preparation and Dielectric Properties of Nanocomposites with Double Cross-linking Network Structure

A kind of BaTiO₃/poly（aryl ether ketone） nanocomposite（BT-BCB/c-DPAEK） with double cross-linking network was obtained by controlling the reaction temperature and time according to the difference of activation energy of functional groups. It was found that BT-BCB/c-DPAEK composite film had better mechanical and thermal properties than pure polymer film and the composite films without crosslinking treatment or with single crosslinking treatment. At the same time， due to the improvement of the interface between the two phases of the composite and the limitation of the polymer molecular chain movement at high temperature， BT-BCB/c-DPAEK showed excellent energy storage performance. Especially at 150 ℃ and 300 MV/m， it still maintained an discharge energy density of 1.75 J/cm³ and a discharge efficiency as high as 80%.