Preparation and Properties of CP@hBT-CNT/PDMS Three-Phase Dielectric Composite
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摘要: 基于卡波姆（CP）和羟基化钛酸钡（hBT）之间的相互作用，通过CP对hBT的包覆制备了“核-壳”结构CP功能化改性的hBT杂化粒子（CP@hBT）。以CP@hBT为陶瓷填料，氨基化碳纳米管（CNT）为导电填料，聚二甲基硅氧烷（PDMS）为基体，利用溶液共混法制备CP@hBT-CNT/PDMS介电复合材料。系统研究了CP功能化改性对CP@hBT-CNT/PDMS微观形貌和介电性能的影响。结果表明，CP对hBT功能化改性后可以有效减少CP@hBT杂化粒子的沉降和团聚问题，增强了其在PDMS基体中的分散性。在1 000 Hz条件下，当w（CNT）=0.75%时，CP@hBT-CNT/PDMS复合材料的介电常数可以达到138，同时介电损耗仍较低。Abstract: In recent years, polymer-based composites with excellent dielectric properties have recently attracted considerable interest for their potential applications in the field of microelectronics, such as electrostriction for artificial muscles, advanced dielectric capacitors and other portable flexible electronics. The combination of ceramic and conductive particles selected for the filler system has been proved to be an effective strategy to improve the dielectric properties of the polymers. The co-existence of the inorganic ceramic and conductive fillers could simultaneously contribute to the relatively higher dielectric constant and lower loss. Therefore, in this work, benefitting from the interaction between carbopol (CP) and hydroxylated barium titanate (hBT) nanoparticles, hBT surface can be coated by CP. Consequently, a core-shell structured nanoparticle was fabricated by surface modification of hBT with CP and named CP@hBT. Subsequently, the CP@hBT nanoparticle was used as the ceramic filler and the amino functionalized multiwalled nanotubes (CNT) was used as the conductive filler, polydimethylsiloxane (PDMS) as the matrix, respectively. Then, CP@hBT-CNT/PDMS dielectric composites were successfully prepared by solution blending. In this work, the effect of surface modification of hBT with CP on the microstructure and the dielectric properties of CP@hBT-CNT/PDMS were systematically studied. The results indicated that the sedimentation and aggregation of CP@hBT nanoparticles can be effectively prevented after the functionalized modification of hBT by CP, thereby leading to enhance dispersion of CP@hBT nanoparticles in PDMS matrix. As a result, with a CNT loading of 0.75% (mass fraction), the CP@hBT-CNT/PDMS composite exhibited a high dielectric constant value of 138 and low dielectric loss(<0.5) at 1 000 Hz.
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Key words:
- dielectric property /
- composite /
- carbopol /
- barium titanate /
- carbon nanotube
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图 1 hBT和CP@hBT的（a）FT-IR谱图和（b）拉曼谱图
Figure 1. （a） FT-IR and （b） Raman spectra of hBT and CP@hBT
图 3 （a） hBT和（b，c） CP@hBT的TEM照片; （d） CP@hBT核-壳粒子形成机理示意图
Figure 3. TEM images of （a） hBT and （b, c） CP@hBT; （d） Schematic diagram of CP@hBT core-shell formation mechanism
图 4 （a，b） hBT-CNT（1.0%）/PDMS复合材料与（c，d） CP@hBT-CNT（1.0%）/PDMS复合材料断面形貌的SEM照片
Figure 4. Cross-section SEM images of （a，b） hBT-CNT（1.0%）/PDMS composite and （c，d） CP@hBT-CNT（1.0%）/PDMS composite
图 5 CP@hBT-CNT/PDMS复合材料的（a）电导率、（b）介电常数以及（c）介电损耗
Figure 5. （a） Conductivity, （b） dielectric constant and （c） dielectric loss of CP@hBT-CNT/PDMS composites
图 6 CP@hBT-CNT/PDMS复合材料的电导率与x的关系
Figure 6. Relationship between the conductivity and x for CP@hBT-CNT/PDMS composite
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