TY - EJOU AU - Yao, Junlong AU - Nie, Wei AU - Sun, Zhengguang AU - Yang, Huan AU - Guan, Yu AU - Gao, Lin AU - Jiang, Xueliang AU - Guo, Mujie AU - Xiong, Chuanxi TI - BaTiO3/Polyurethane Dielectric Composites with Diels-Alder Bond for Improved Self-Healing Properties T2 - Journal of Renewable Materials PY - 2022 VL - 10 IS - 9 SN - 2164-6341 AB - In general, self-healing dielectric composites are mainly composed of polar hydrogen bonds, which have high hydrophilicity and are unsuitable for humid environment. Dielectric composite with Diels-Alder (D-A) bond contains covalent bonds, it can be adopted as an efficient self-healing material. Here, we construct self-healing barium titanate (BT)/polyurethane (PU) dielectric composites by adopting PU with D-A bond as matrix (BT/ PU-DA). The prepared 10% BT/PU-DA composite exhibits superior self-healing ability than that of PU-DA. Moreover, its dielectric constant can reach 9.3 with a loss of only 0.04 at 1000 Hz and maintain 93% repair effi- ciency of tensile strength. The experimental analysis suggests the introduction of D-A bond can enhance the thermostability and self-healing ability of BT/PU-DA composite. In addition, the incorporation of BT nanoparticles and D-A bond in the self-healing composite contributes to the lower dielectric loss and excellent tensile strength after healing. The adopted strategy is a promising and facile approach to develop highly efficient self-healing dielectric material, which will be conducive to reuse and sustainable development of the electronic packaging material in aqueous medium or wet environment. KW - Diels-Alder bond; self-healing; dielectric properties; tensile strength; polyurethane DO - 10.32604/jrm.2022.019339