Polymer-Based Composites with High Dielectric Constant and Low Dielectric Loss

Transcript

1 PROGRESS IN CHEMISTRY Vol. 22 No. 8 Aug * TB33 TM A X Polymer-Based Composites with High Dielectric Constant and Low Dielectric Loss Lu Pengjian Wang Yilong Sun Zhigang Guan Jianguo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Abstract Due to the wide important application of the polymer-based composites with both high dielectric constant and low dielectric loss in such fields as electrical and electronic engineering this paper reviews almost all the state-of-the-art research work focusing on them. In the attempt to establish the principles to design and prepare the polymer-based composites with high dielectric constant and low dielectric loss the effects of functional fillers polymer matrixes and their interaction on the dielectric properties of the polymer-based composites are discussed in details. As a consequence the future research trends are pointed out involving the development of the innovative approaches to prepare functional fillers with controlled structures morphologies and sizes advanced facile composite processes and techniques to adjust the interfaces and the theoretical models to correlate dielectric properties with the structure of the functional fillers etc. Key words dielectric constant dielectric loss composites polymers Contents 1 Introduction 2 The effect of the functional fillers on the dielectric properties of the polymer-based composites 2. 1 The types of the functional fillers 2. 2 The size and morphology of fillers 3 The effect of the polymer matrixes on the dielectric properties of the polymer-based composites 4 The effect of the interface between functional fillers and polymer matrixes on the dielectric properties of the polymer-based composites 5 The engineering applications of the polymer-based composites with high dielectric constant and low * 863 No. 2006AA03Z461 No. A Corresponding author guanjg@ whut. edu. cn

2 dielectric loss 6 Conclusion Ag 23% / / 12 ε Ag-epoxy 12 Ag Fig. 1 Dielectric constant values of Ag / epoxy composites with different Ag filler loading at room temperature 12 Al Ag Ni / Al Ag ε = ε 1 p c - p - β 1 p p c p < p c β - 1 Xu 13 Al

3 Al Al Ag 80% Shen Ag C > 300 < BT BST Lai 12 Ag / 40nm 22% 3 PVDF BT 22 MWNTs 19 2 BT Fig. 3 SEM photo of fractured surfaces of the TFP-MWNT / / BT PVDF inset is the TEM micrographs of the TFP- / BT MWNTs 19 BT BT Lu 20 BT BaTiO 3 - PMN- Dang 18 Yang 19 PT MWNTs PVDF Fig Ag@ C Ag@ C core-shell structure Kim 21 BaTiO nm 1μm 1μm BT Ag / / Ag 3. 7% / Cheng 23

4 CaCu 3 Ti 4 O 12 CCTO 1kHz Lu / 10Hz 100Hz Bai 24 PMN-PT % 200 excluded volume 6 V ex V ex f c BaTiO f c = 1 - exp - B c V / V ex V V ex B c L / d = Rao 30 / Zhang Li 31 CuPc 10 5 P VDF-TrFE % Gelves Hz CuPc Ang 33 Huang 27 1 Table 1 Composition and dielectric properties of high dielectric constant materials filler polymer matrix ε tanδ filler loading filler size ref Ag epoxy ~ 300 1kHz kHz 22% 40nm 12 Ag@ C epoxy > 300 1kHz < kHz 25% 30% 80 90nm 16 Al / Ag epoxy kHz kHz 80% Al Ag < 20nm Al@ Al 2 O 3 epoxy kHz kHz 80% 3. 0μm 13 Ni PVDF Hz Hz 28% ~ 30nm 41 BaTiO 3 epoxy 40 1Hz Hz 60% nm 42 Ag / BaTiO 3 epoxy 450 1kHz kHz Ag 22% BaTiO 3 30% Ag 40nm 25 PANI epoxy kHz < kHz 25% 28 Ag / carbon black epoxy kHz Ag 3. 7wt% CB 20wt% Ag 13nm 20 TFP-MWNT PVDF kHz 20 1kHz 15% 5 15μm 18

5 < < 34 1 / Rao 44 Lu nm 3 5nm Al Al / Ag-epoxy 50% Ag- 2 Bai 24 P VDF-TrFE P VDF-TrFE PS Fig. 4 TEM micrograph of Ag nanoparticles synthesized epoxy PVDF PET within epoxy resin via in-situ photochemical reduction PC PPS HTPP 2 6- PEN PI Li 43 HDPE LDPE 5 11 HDPE LDPE LDPE Al / epoxy 40 method 40

6 Fig Schematic for filler / polymer materials consisting of filler particles interface and matrix 11 1 /5 50% 11 Lai 25 Ag 48 6 Nelson 45 TiO 2 Lewis Shi 47

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