聚氨酯/钛酸铜镧钠复合材料的制备及介电性研究
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摘要
采用溶胶-凝胶法制备了钛酸铜镧钠Na_(0.5)La_(0.5)Cu_3Ti_4O_(12)(NLCTO)陶瓷粉末填料。以聚氨酯(PU)材料为基体,采用原位聚合方法,制备了PU/NLCTO复合材料。利用红外光谱仪、X射线衍射仪、扫描电子显微镜、阻抗分析仪对复合材料的结构和性能进行了研究。结果表明:随着NLCTO陶瓷粉体含量增加,复合材料的介电常数和电导率相应地增大,但其介电损耗在一定的频率范围内变化不大。当NLCTO质量分数达到30%时,复合材料的介电常数在100 Hz下达到64.5,是聚氨酯基体的5倍;在10 k Hz下达到22,是聚氨酯基体的7.5倍。
The Na_(0.5) La_(0.5) Cu_3 Ti_4 O_(12)(NLCTO)ceramics powders were prepared by the sol-gel method. The PU/NLCTO composites were prepared by situ polymerization using polyurethane(PU) as the matrix. The structure and properties of PU/NLCTO composite were investigated by FT-IR spectra and scanning electron microscope(SEM),X-Ray Diffraction(XRD)and impedance. The results showed that the dielectric constant and conductivity were increased with the increasing of NLCTO content,but its dielectric loss did not change much within a certain frequency range. Filled with 30 wt % NLCTO,the dielectric constant of the composite reaehed 64. 5 at 100 Hz and 22 at 10 k Hz,respectively,which were 5 and 7. 5 times that of the polyurethane matrix.
The Na_(0.5) La_(0.5) Cu_3 Ti_4 O_(12)(NLCTO)ceramics powders were prepared by the sol-gel method. The PU/NLCTO composites were prepared by situ polymerization using polyurethane(PU) as the matrix. The structure and properties of PU/NLCTO composite were investigated by FT-IR spectra and scanning electron microscope(SEM),X-Ray Diffraction(XRD)and impedance. The results showed that the dielectric constant and conductivity were increased with the increasing of NLCTO content,but its dielectric loss did not change much within a certain frequency range. Filled with 30 wt % NLCTO,the dielectric constant of the composite reaehed 64. 5 at 100 Hz and 22 at 10 k Hz,respectively,which were 5 and 7. 5 times that of the polyurethane matrix.
引文
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[4]倪磊.CaCu3Ti4O12陶瓷的巨介电效应及其调控[D].杭州:浙江大学,2009:1-21.
[5]吴鹏飞.高介电常数聚合物基复合材料的研究[D].苏州:苏州大学,2010:1-19.
[6]刘继红.高性能埋容复合介质材料的制备与性能[D].广州:华南理工大学,2013:27-38.
[7]李斌,但敏,郭爱波,等.高介电性能绝缘材料新制备方法的研究[J].绝缘材料,2006,39(5):9-12.
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[14]Huang,E Q,Zhao J,Zha J W,et al.Preparation and wide-frequency dielectric properties of(Ba0.5Sr0.4Ca0.1)TiO3/poly(vinylidene fluoride)composites[J].Journal of Applied Physics,2014,115(19):194102-194108.
[15]郑阳.钛酸钡/聚苯乙烯高介电复合材料的制备及介电性能研究[D].北京:北京化工大学,2007:35-54.
[16]杨红艳,栾道成,王红,等.聚氨酯/纳米碳酸钙复合材料及性能的研究[J].高分子材料科学与工程,2006,22(6):106-109.
[17]陈莹.热塑性聚氨酯/无机粒子功能复合材料的制备及性能研究[D].上海:东华大学,2012:21-25.