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Issue 1, 2015
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Polypyrrole doped epoxy resin nanocomposites with enhanced mechanical properties and reduced flammability

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Abstract

For the liquid epoxy nanosuspensions with both fibril and spherical polypyrrole (PPy) nanostructures, a stronger PPy nanofibers/epoxy interaction and more temperature stable behavior with a lower flow activation energy of nanosuspensions with nanofibers (54.34 kJ mol−1) than that with nanospheres (71.15 kJ mol−1) were revealed by rheological studies. As well as the common enhancing mechanism of limiting crack propagation in the polymer matrix, the nanofibers further initiated the shear bands in the epoxy resin to give a higher tensile strength (90.36 MPa) than that of pure epoxy (70.03 MPa) and even that of the epoxy nanocomposites with nanospheres (84.53 MPa). With a larger specific surface area, the nanofibers rather than nanospheres were observed to reduce the flammability of epoxy more efficiently by assisting more char formation of the epoxy resin. The hydroxyl groups formed between the protons of the doped acid in the PPy nanofillers and the epoxy broke the conjugate structure of PPy, leading to a higher bandgap in the nanocomposites (Eg1 = 3.08 eV for 1.0 wt% PPy nanofibers) than that of pure nanofillers (1.8 eV for PPy nanofibers and 1.2 eV for PPy nanospheres). Due to the high aspect ratio, the PPy nanofibers could form the conductive path more easily than the PPy nanospheres to provide a lower percolation threshold value. The real permittivity was observed to increase with increasing the PPy nanofiller loading, and the enhanced permittivity was interpreted by the interfacial polarization.

Graphical abstract: Polypyrrole doped epoxy resin nanocomposites with enhanced mechanical properties and reduced flammability

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Publication details

The article was received on 04 Sep 2014, accepted on 17 Oct 2014 and first published on 17 Oct 2014


Article type: Paper
DOI: 10.1039/C4TC01978D
Citation: J. Mater. Chem. C, 2015,3, 162-176
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    Polypyrrole doped epoxy resin nanocomposites with enhanced mechanical properties and reduced flammability

    X. Zhang, X. Yan, J. Guo, Z. Liu, D. Jiang, Q. He, H. Wei, H. Gu, H. A. Colorado, X. Zhang, S. Wei and Z. Guo, J. Mater. Chem. C, 2015, 3, 162
    DOI: 10.1039/C4TC01978D

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