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Poly(amic acid)–clay nacrelike composites prepared by electrophoretic deposition

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Abstract

Poly(amic acid) (PAA)–clay nacrelike composite films have been prepared by electrophoretic deposition of an emulsion of PAA, which was synthesized from pyromellitic dianhydride and 4,4′-dianminodiphenyl ether (ODA), containing various loadings of ODA-modified montmorillonite (MMT). The layered silicate was intercalated through reacting with PAA, and the ordered layered assembly of the PAA–MMT composite films was successfully accomplished, as conformed by Fourier transform infrared analysis and x-ray diffraction. The structural characterization of the films was supported by scanning electron microscopy, which displayed an ordered layered structure. The thermogravimetric analysis showed the content of the ODA-modified clay in PAA–MMT composite films that changed from 14.3 to 32.1 wt% and the improved thermal properties of the composite films. The mechanical properties of the composites were measured by tensile test. It was found that the modulus and strength of the composite films were greatly improved compared to those of the pure polymer film. An increment of about 155% in the modulus and 40% in the tensile strength were obtained from the composite films.

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Acknowledgments

This work was supported in part by the National Science Foundation of China (Grant No. 50572044), and in part by the 973 Project of the Ministry of Science and Technology of China (Grant No. 2006CB605207-2). Special thanks go to the Program for New Century Excellent Talents in Universities from the Ministry of Education of China (Grant No. NCET-04-0083) for its support.

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Authors and Affiliations

  1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China

    Chang-An Wang

  2. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China

    Bin Long

  3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100084, People’s Republic of China

    Bin Long

  4. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China

    Wei Lin

  5. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100084, People’s Republic of China

    Yong Huang & Jialin Sun

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  1. Chang-An Wang
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  2. Bin Long
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  3. Wei Lin
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Correspondence to Chang-An Wang.

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Wang, CA., Long, B., Lin, W. et al. Poly(amic acid)–clay nacrelike composites prepared by electrophoretic deposition. Journal of Materials Research 23, 1706–1712 (2008). https://doi.org/10.1557/JMR.2008.0209

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