Preparation and dielectric properties of core–shell structural composites of poly(1H,1H,2H,2H-perfluorooctyl methacrylate)@BaTiO3 nanoparticles
Preparation and dielectric properties of core–shell structural composites of poly(1H,1H,2H,2H-perfluorooctyl methacrylate)@BaTiO3 nanoparticles
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DOI：
10.1016/j.apsusc.2013.03.178
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发表时间：
2013-07
影响因子：
6.7
通讯作者：
Xianhong Zhang;Haochuan Chen;Yuhong Ma;Changwen Zhao;Wantai Yang
中科院分区：
文献类型：
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作者：
Xianhong Zhang;Haochuan Chen;Yuhong Ma;Changwen Zhao;Wantai Yang
采用表面修饰和表面引发原子转移自由基接枝聚合(SI-ATRP)两步法制备了具有较高介电常数的聚合物纳米复合薄膜聚(1H，1H，2H，2H-全氟甲基丙烯酸辛酯)@BaTiO3(PPFOMA@BaTiO3)。首先，对纳米BaTiO_3进行羟基化、硅化和酰胺化处理，使其具有SI-ATRP能力。然后在70℃下用SI-ATRP将改性的BaTiO_3纳米粒子接枝到PPFOMA链上，形成核壳复合材料。在室温下测量了聚合物结构和聚合物/BaTiO_3比例对介电性能的影响，频率范围从40 Hz到30 MHz。结果表明，BaTiO_3的加入显著提高了介电常数(K)，降低了介电损耗。当BaTiO_3负载量达到70.70wt%时，复合材料在100 kHz室温下的k达到7.4，几乎是纯PPFOMA(k=2.6)的3倍。而PPFOMA@BaTiO_3复合材料的介电损耗(tanδ)约为0.01，远低于纯PPFOMA的介电损耗(tanδ=0.04)。
Polymer nanocomposite films, poly(1H,1H,2H,2H-perfluorooctyl methacrylate)@BaTiO3(PPFOMA@BaTiO3), with enhanced dielectric permittivity was fabricated via a two-step processes, consisting of BaTiO3nanoparticle surface modification and surface initiated atom transfer radical grafting polymerization (SI-ATRP). At first, BaTiO3nanoparticles were treated by hydroxylation, silylation and amidation to offer their SI-ATRP capability. Then PPFOMA chains were grafted from the modified BaTiO3nanoparticles by SI-ATRP at 70°C to form core–shell composites. The effects of polymer structure and polymer/BaTiO3ratios on dielectric properties were measured over a broad frequency from 40Hz to 30MHz at room temperature. The results showed that the dielectric constant (k) increased and dielectric loss reduced significantly with the addition of BaTiO3. The k of the composite was up to 7.4 at 100kHz at room temperature when the BaTiO3loading was up to 70.70wt% which is almost three time of pure PPFOMA (k=2.6). While the dielectric loss (tanδ) of PPFOMA@BaTiO3composite was about 0.01, which was much lower than that of the pure PPFOMA (tanδ=0.04).