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 7.9vol%,the dielectric constant of the composite was as high as 59,and the dielectric loss was only 0.22(at1 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.
作者
谢光友
杨科
于湘彦
李衡峰
XIE Guangyou;YANG Ke;YU Xiangyan;LI Hengfeng(School of Material science and Engineering,Central South University,Changsha 410083,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2019年第4期4074-4079,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51573209)
关键词
银纳米线
聚多巴胺
聚合物基复合材料
介电性能
Ag nanowires
polydopamine
polymer matrix composite
dielectric properties
