Dielectric relaxations of high- k poly(butylene succinate) based all-organic nanocomposite films for capacitor applicati
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Shanming Ke Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
Yihe Zhang,a) Bo Shen, and Anzhen Zhang State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China
Haitao Huangb) Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China (Received 26 May 2011; accepted 3 August 2011)
High-dielectric constant all-organic composite films consisting of polyaniline (PANI) filler and poly(butylene succinate) host were synthesized by simple blending process. The chemical structures and morphology of the composite films were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy, respectively. The dielectric properties of the composite films with different filler concentrations were studied in the frequency range of 100–106 Hz. A percolation phenomenon was observed in the composite films with a percolation threshold vc 5 19.7% and the dielectric constant was 10 times that of the pure host material. The enhancement in the dielectric constant can be ascribed to Maxwell–Wagner–Sillars polarization and the low-dielectric loss to good dispersion of PANI filler in the host. As the host polymer is biodegradable, it may be applied as a “green” dielectric material. I. INTRODUCTION
Recently, there is a great demand for novel highdielectric constant (high-k) materials for improved gate, embedded and charge-storage capacitor applications.1–5 Although there is an impressive industry for capacitors made of inorganic materials, these materials often suffer from low-dielectric breakdown strength and poor flexibility. To overcome these limitations, polymeric matrixes with inorganic ferroelectric ceramic fillers have been tried.6 The use of all-organic materials offers an alternative approach to overcoming these limitations.7–9 For instance, a polymer matrix embedded with Cu-phthalocyanine oligomer showed an impressive dielectric response as well as good stability and flexibility.10 The polymer matrixes most commonly used in the preparation of high-k composites are polyimide, epoxy, and ferroelectric polymers, which include poly(vinylidene fluoride) (PVDF) and its copolymers. Because of the growing
Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2011.271 J. Mater. Res., Vol. 26, No. 19, Oct 14, 2011
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global concern on pollution control, “green” dielectrics which are biodegradable have attracted more and more attention.11 Poly(butylene succinate) (PBS) is a kind of biodegradable synthetic aliphatic polyester and can be decomposed by microbes without affecting the environment and ecosystem. Its chemical structure is shown in Fig. 1. It is frequently used in packing film and bags, and it has excelle
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