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Preparation and properties of KH550-Al2O3/PI–EP nanocomposite material

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Abstract

First, polyimide (PI)–epoxy resin (EP) polymer matrix was prepared from 3,3′-diethyl-4,4′-diamino diphenyl methane (DEDADPM), benzophenone tetracarboxylic acid dianhydride (BTDA) and epoxy resin (E-51), through thermal imide process. Then, the nanometer alumina (Al2O3) modified by the coupling agent, (3-aminopropyl)triethoxysilane (KH550), was doped into the PI–EP polymer matrix, using an in situ sol–gel method to prepare a series of KH550-Al2O3/PI–EP nanocomposite materials based on different KH550-Al2O3 contents. Fourier transform infrared spectroscopy (FTIR) indicated that in the presence of chemical reaction between poly(amic acid) and epoxy resin, an imide ring was formed, the thermal imidization reaction of the materials was completed and the KH550-Al2O3 had doped into the PI–EP polymer matrix. The heat-resistance, dielectric specification and mechanical properties of KH550-Al2O3/PI–EP nanocomposite materials were evaluated. The results showed that the decomposition temperatures were ranged between 438 and 450 °C, dielectric constant and dielectric loss were in the range of 3.32–3.71 and 1.5 × 10−3–2.5 × 10−2, respectively, and they all increased with the increase of KH550-Al2O3 content (0–10 wt%), but the shear strength first increased and then decreased, attained its maximum value of 10.64 MPa at 8 wt%, which was about 119 % higher than that of undoped material. The adhesive forces of nanocomposite materials were all at higher level (one or two levels). Thus, the overall performance of KH550-Al2O3/PI–EP nanocomposites was the best when the doping amount of KH550-Al2O3 was 8 wt%. The properties such as high heat-resistance, dielectric properties and ready attachment of impregnating varnish to steel plate with very high strength fully met the necessary requirement.

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Acknowledgments

The authors would like to express their appreciation of project supported by the Heilongjiang Province natural science foundation (11551071) and Harbin science and technology innovation Foundation (2012RFJGG006).

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Authors and Affiliations

  1. The College of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Yufei Chen, Wei Yue, Zongzhen Bian, Yong Fan & Qingquan Lei

  2. Key Laboratory of Engineering Dielectrics and its Application, Harbin University of Science and Technology, Ministry of Education, Harbin, 150080, China

    Yufei Chen & Yong Fan

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  1. Yufei Chen
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  2. Wei Yue
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  3. Zongzhen Bian
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  4. Yong Fan
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  5. Qingquan Lei
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Correspondence to Yufei Chen.

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Chen, Y., Yue, W., Bian, Z. et al. Preparation and properties of KH550-Al2O3/PI–EP nanocomposite material. Iran Polym J 22, 377–383 (2013). https://doi.org/10.1007/s13726-013-0137-3

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  • DOI: https://doi.org/10.1007/s13726-013-0137-3

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