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Preparation and dielectric properties of surface modified TiO2/PEN composite films with high thermal stability and flexibility

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Abstract

A series of surface modified titanium dioxide (TiO2)/polyarylene ether nitriles (PEN) composite films with different modified TiO2 contents were prepared by solution casting method combined with ultrasonic dispersion technology. TiO2 particles were successfully surface modified by PEN–COOH polymer previously, which was confirmed by transmission electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. Besides, SEM images of composite films revealed that the interfacial adhesion between surface modified TiO2 particles and the PEN matrix was effectively improved because of their common cyano groups and similar structure units. Furthermore, thermal, mechanical and dielectric characterizations showed that the composite films possess excellent thermal properties and flexibility as well as good dielectric properties, their glass transition temperatures were as high as 223 °C and the initial decomposition temperatures were all above 480 °C. In addition, it was found that the tensile strength of modified TiO2/PEN composites was better than raw TiO2/PEN composites. More importantly, the dielectric constant of composite films increases linearly with increment of the surface modified TiO2 particles content. When the mass fraction of modified TiO2 particles reached 40 %, the dielectric constant of the composite film increased to 7.9 (1 kHz), while the dielectric loss is just 0.028 (1 kHz).

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Acknowledgments

The authors wish to thank for financial support of this work from the National Natural Science Foundation (No. 51173021) and “863” National Major Program of High Technology (2012AA03A212).

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Authors and Affiliations

  1. Research Branch of Advanced Functional Materials, Institute of Microelectronic and Solid State Electronic, High-Temperature Resistant Polymers and Composites Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu, 610054, People’s Republic of China

    Xu Huang, Zejun Pu, Lifen Tong, Zicheng Wang & Xiaobo Liu

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  1. Xu Huang
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  2. Zejun Pu
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  3. Lifen Tong
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  4. Zicheng Wang
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  5. Xiaobo Liu
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Correspondence to Xiaobo Liu.

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Huang, X., Pu, Z., Tong, L. et al. Preparation and dielectric properties of surface modified TiO2/PEN composite films with high thermal stability and flexibility. J Mater Sci: Mater Electron 23, 2089–2097 (2012). https://doi.org/10.1007/s10854-012-0919-y

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  • DOI: https://doi.org/10.1007/s10854-012-0919-y

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