柔性PMIA复合电介质的制备及其储能特性

Preparation and energy storage performance of flexible poly(m-phenyleneisophthalamide)dielectric composites

为了抑制由于钛酸钡(BT)纳米粒子和聚间苯二甲酰间苯二胺(PMIA)介电常数差异引起的PMIA复合电介质内部局部电场畸变,分别将TiO_(2)和聚多巴胺(PDA)包裹在BT纳米粒子表面形成双核壳结构PDA@TiO_(2)@BT复合粒子(PTBP),随后将PTBP与PMIA浆料复合制备了PTBP/PMIA复合膜。采用FTIR、XRD、SEM对样品进行了表征,测试了PTBP/PMIA复合膜的介电性能、击穿强度及储能特性。结果表明,随着PTBP含量(以PMIA固体质量计,下同)的增加,PTBP/PMIA复合膜的介电常数明显提升;当PTBP含量为10%时,PTBP/PMIA复合膜在1×10^(3)Hz时的介电常数比PMIA基体提高了57.1%,在高温环境中(>150℃),其介电性能保持稳定。此外,PTBP还明显改善了PTBP/PMIA复合膜的储能特性;当PTBP含量为10%时,PTBP/PMIA复合膜在室温、电场强度为250 MV/m时的储能密度和放电能量密度分别为1.91和1.23 J/cm^(3),比PMIA基体分别提升了103.2%和61.8%。

In order to suppress the local electric field distortion caused by the dielectric constant difference between barium titanate(BT)nanoparticles and poly(m-phenyleneisophthalamide)(PMIA)dielectric composites,TiO_(2)and polydopamine(PDA)were coated on the surface of BT to generate core-double-shell structured PDA@TiO_(2)@BT nanoparticles(PTBP),which were then added to PMIA paste to fabricate PTBP/PMIA dielectric composite films.The composite films obtained were characterized by FTIR,XRD and SEM,and analyzed for their dielectric properties,breakdown strength and energy storage characteristics.The results showed that the dielectric constant of PMIA dielectric composite significantly increased with the increase of PTBP content(based on the mass of PMIA,the same below).When PTBP content reached up to 10%,the dielectric constant of PTBP/PMIA composite film was increased by 57.1%compared with that of PMIA matrix at 1×10^(3)Hz,and that also maintained stable at high temperature(>150℃).Moreover,the energy storage properties of PTBP/PMIA dielectric composite films were significantly improved by the addition of PTBP.When PTBP content was 10%,the energy storage density and discharge energy density of PTBP/PMIA composite film were 1.91 and 1.23 J/cm^(3)at room temperature and 250 MV/m,respectively,which were 103.2%and 61.8%higher than those of PMIA matrix.