Ag@PDA/P(VDF-HFP)复合材料的制备及介电性能
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摘要
采用水热法以硝酸银、PVP和多巴胺为原料分两步制备得到了聚多巴胺包覆改性的银纳米线(Ag@PDA NWs),通过溶液共混以P(VDF-HFP)为基体制备了纳米线含量不同的Ag@PDA/P(VDF-HFP)复合材料。利用XRD、XPS、TEM对Ag@PDA的形貌、结构和化学成分进行了表征,结果证明多巴胺成功聚合并包裹在了银纳米线的表面。利用SEM、FT-IR、TG和阻抗分析仪对复合材料的结构、热稳定性和介电性能进行了表征,结果表明纳米填料与聚合物基体之间的界面结合效果极好。在1 kHz下,当填料的体积分数为7.9%(体积分数)时,复合材料的介电常数高达59,介电损耗只有0.22。以上研究结果表明聚多巴胺层的包覆改性有效改善了纳米填料与聚合物基体的界面相容性,且逾渗体系的成功构建可以在较低的填料体积分数下得到优异的介电性能。
Polydopamine coated silver nanowires(Ag@PDA) were prepared by hydrothermal method with silver nitrate, PVP and dopamine as raw materials. The Ag@PDA/P(VDF-HFP) composites with different nanowire content were prepared by solution blending of P(VDF-HFP) and Ag@PDA. The morphology, structure and chemical composition of Ag@PDA were characterized by XRD, XPS and TEM. The results indicate that dopamine was successfully polymerized and coated on the surface of silver nanowires. The structure, thermal stability and dielectric properties of the Ag@PDA/P(VDF-HFP) composites were characterized by SEM, FT-IR, TG and impedance analyzer. The results show that the interfacial compatibility between the nanofiller and the polymer matrix was excellent. Furthermore, when the volume fraction of the nanofiller was 7.9 vol%, the dielectric constant of the composite was as high as 59, and the dielectric loss was only 0.22(at 1 kHz). The above results indicate that the coating modification of the polydopamine layer effectively improved the interfacial compatibility between the nanofiller and the polymer matrix, and the successful construction of the percolation system could obtain excellent dielectric properties at a lower volume fraction.
Polydopamine coated silver nanowires(Ag@PDA) were prepared by hydrothermal method with silver nitrate, PVP and dopamine as raw materials. The Ag@PDA/P(VDF-HFP) composites with different nanowire content were prepared by solution blending of P(VDF-HFP) and Ag@PDA. The morphology, structure and chemical composition of Ag@PDA were characterized by XRD, XPS and TEM. The results indicate that dopamine was successfully polymerized and coated on the surface of silver nanowires. The structure, thermal stability and dielectric properties of the Ag@PDA/P(VDF-HFP) composites were characterized by SEM, FT-IR, TG and impedance analyzer. The results show that the interfacial compatibility between the nanofiller and the polymer matrix was excellent. Furthermore, when the volume fraction of the nanofiller was 7.9 vol%, the dielectric constant of the composite was as high as 59, and the dielectric loss was only 0.22(at 1 kHz). The above results indicate that the coating modification of the polydopamine layer effectively improved the interfacial compatibility between the nanofiller and the polymer matrix, and the successful construction of the percolation system could obtain excellent dielectric properties at a lower volume fraction.
引文
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[11] Zhang Y,Wang Y,Deng Y,et al.High dielectric constant and low loss in polymer composites filled by self-passivated zinc particles[J].Materials Letters,2012,72(4):9-11.
[12] Yang D,Ruan M,Huang S,et al.Improved electromechanical properties of NBR dielectric composites by poly(dopamine) and silane surface functionalized TiO2 nanoparticles[J].Journal of Materials Chemistry C,2016,4(33):7724-7734.
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[15] Zhang L,Yuan S,Chen S,et al.Preparation and dielectric properties of core-shell structured Ag@polydopamine/poly(vinylidene fluoride) composites[J].Composites Science & Technology,2015,110:126-131.
[16] Tang H,Lin Y,Sodano H A.Synthesis of high aspect ratio batio 3 nanowires for high energy density nanocomposite capacitors[J].Advanced Energy Materials,2013,3(4):451-456.
[17] Ran Y,He W,Wang K,et al.A one-step route to Ag nanowires with a diameter below 40 nm and an aspect ratio above 1 000[J].Chemical Communications,2014,50(94):14877-14880.
[18] Sun Y,Gates B,Mayers B,et al.Crystalline silver nanowires by soft solution processing[J].Nano Letters,2002,2(2):165-168.
[19] Nan C W .Physics of inhomogeneous inorganic materials[J].Progress in Materials Science,1993,37(1):1-116.
[20] Dang Z M,Wu J P,Xu H P,et al.Dielectric properties of upright carbon fiber filled poly(vinylidene fluoride) composite with low percolation threshold and weak temperature dependence[J].Applied Physics Letters,2007,91(7):2101-2104.