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Polymeric Matrix Composites with High Dielectric Constant

Author: WuPengFei
Tutor: LiangGuoZheng
School: Suzhou University
Course: Materials Science
Keywords: Polyaniline Calcium copper titanate Epoxy resin Situ polymerization Dielectric properties
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 458
Quote: 1
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Abstract


The high dielectric constant material is a very broad application prospects of the insulating material, it has a very good performance of the store electrical energy and a uniform electric field, has very important applications in the electronics, electrical and cable industry. Therefore, to improve the dielectric material permittivity of great significance. Are lightweight, easy processing, high dielectric constant of the advantages of low cost and good mechanical properties of polymer matrix composites are being world-wide attention. High dielectric constant polymer matrix composites systems with two-phase ceramic / polymer composites and conductor / polymer composites, compared conductor / ceramic / polymer composite three-phase composite high dielectric constant. Therefore, to carry out the conductor three-phase composite / ceramic / polymer is of great practical significance. A few studies of such composite system of choice of conductor material are mostly inorganic materials such as metal, graphite and carbon nanotubes, conductive polymer polyaniline (PANI) as a conductor. In the preparation process of the composite system, the vast majority of studies using traditional mechanical mixing and solution blending can system polyphase component the better composite situ polymerization preparation process is rarely reported . The papers situ polymerization process to prepare a class conductor (PANI) / ceramic (the BaTiO 3 ) binary composite precursor, and thus overall performance epoxy resin (Epoxy) as a matrix prepared a the conductor (PANI) / ceramic (CCTO) / polymer (Epoxy) three-phase composite. Studied the morphology of the two types of composite system, electrical properties, dielectric properties and thermal properties, which provide theoretical and experimental basis for these new polymer-based composite applications. System by the in situ polymerization of hydrochloric acid (HCl) and sodium dodecyl benzene sulfonic acid (DBSA) doped PANI (HCl) / of BaTiO 3 (K) and PANI (DBSA) / the BaTiO 3 (K) composite precursors, both showed a PANI to cladding of BaTiO 3 core-shell structure. Comparative study of PANI (HCl) / the BaTiO 3 (K) and PANI (DBSA) / BaTiO 3 (K) the thermal stability of the composite material, the conductivity and dielectric properties. PANI (HCl) / BaTiO 3 (K) compared to PANI (DBSA) / BaTiO 3 (K) significantly improve the thermal stability of the composite, and has more high electrical conductivity and permittivity. The PANI / CCTO / Epoxy composites prepared by in situ polymerization Epoxy resin, curing of the composite system of CCTO / Epoxy and PANI / CCTO / Epoxy, reactive. The gel time and the DSC analysis showed that of CCTO and PANI were cured of Epoxy hinder, reduce the curing rate of the system. The SEM studies showed that the filler CCTO and PANI good dispersibility, have a good compatibility with Epoxy base body. By DMA and TG means to study the thermal properties of the composites. DMA studies show, along with the the CCTO and of PANI / of CCTO mixed filler added, the Tg of the composite material is gradually decreased. TG studies have shown that the optimal of CCTO (K) 20% / Epoxy Composites Thermal Stability PANT 5% / of CCTO (K) 20% / Epoxy second, both compared to the resin matrix EPOXY heat resistance were improved. By broadband dielectric spectroscopy study of the conductivity and dielectric properties of the composites. PANT m / of CCTO (K), 20% / Epoxy Composites percolation threshold is about 0.06, the conductivity, dielectric constant and dielectric loss of the composite material near the percolation threshold significant mutation. When PANI the volume fraction is below the percolation threshold, the composite dielectric constant of the frequency variation is very small; When the the PANI volume fraction close to the percolation threshold, the dielectric constant of the composite material increases rapidly with increasing PANI content reduce rapidly with increasing frequency. PANT m / of CCTO (K), 20% under the conditions of room temperature 1KHz / Epoxy Composites PANI volume fraction of 10% (m = 10%) obtained when the maximum dielectric constant of 220, with respect to the matrix resin Epoxy 62-fold increase. ?

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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