Ouyang Zen-Wei, Chen Erh-Chiang, Wu Tzong-Ming
Department of Materials Science and Engineering, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 402, Taiwan.
Materials (Basel). 2015 Jul 22;8(7):4553-4564. doi: 10.3390/ma8074553.
This work describes the thermal stability and magnetic properties of polyvinylidene fluoride (PVDF)/magnetite nanocomposites fabricated using the solution mixing technique. The image of transmission electron microscopy for PVDF/magnetite nanocomposites reveals that the 13 nm magnetite nanoparticles are well distributed in PVDF matrix. The electroactive β-phase and piezoelectric responses of PVDF/magnetite nanocomposites are increased as the loading of magnetite nanoparticles increases. The piezoelectric responses of PVDF/magnetite films are extensively increased about five times in magnitude with applied strength of electrical field at 35 MV/m. The magnetic properties of PVDF/magnetite nanocomposites exhibit supermagnetism with saturation magnetization in the range of 1.6 × 10-3.1 × 10 emu/g, which increases as the amount of magnetite nanoparticles increases. The incorporation of 2 wt % magnetite nanoparticles into the PVDF matrix improves the thermal stability about 25 °C as compared to that of PVDF. The effect of magnetite particles on the isothermal degradation behavior of PVDF is also investigated.
这项工作描述了采用溶液混合技术制备的聚偏氟乙烯（PVDF）/磁铁矿纳米复合材料的热稳定性和磁性能。PVDF/磁铁矿纳米复合材料的透射电子显微镜图像显示，13纳米的磁铁矿纳米颗粒在PVDF基体中分布良好。随着磁铁矿纳米颗粒负载量的增加，PVDF/磁铁矿纳米复合材料的电活性β相和压电响应增强。在35 MV/m的电场强度下，PVDF/磁铁矿薄膜的压电响应在幅度上大幅增加了约五倍。PVDF/磁铁矿纳米复合材料的磁性能表现出超顺磁性，饱和磁化强度在1.6×10 - 3.1×10 emu/g范围内，且随着磁铁矿纳米颗粒数量的增加而增大。与PVDF相比，在PVDF基体中掺入2 wt%的磁铁矿纳米颗粒可将热稳定性提高约25℃。还研究了磁铁矿颗粒对PVDF等温降解行为的影响。
