388696 Reinforced Magnetic Epoxy Nanocomposites with Conductive Polypyrrole Nanocoating on Nanomagnetite As a Coupling Agent

Tuesday, November 18, 2014: 4:55 PM
International 3 (Marriott Marquis Atlanta)
Jiang Guo1, Hongbo Gu1, Xi Zhang2, Daowei Jiang1, Suying Wei3 and Zhanhu Guo1, (1)Integrated Composites Laboratory (ICL), Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX, (2)Integrated Composites Laboratory (ICL), Dan F. Smith Department of Chemical Engineering, Lamar university, Beaumont, TX, (3)Department of Chemistry and Biochemistry, Lamar University, Beaumont, TX

The new function of polypyrrole (PPy) to serve as a coupling agent has been demonstrated in preparing conductive epoxy resin nanocomposites with PPy coating on magnetite (f-Fe3O4) nanoparticles. Compared with pure epoxy suspension, the viscosity of epoxy nanosuspensions with 5.0 and 10.0 wt% f-Fe3O4 nanoparticles was almost the same. The glass transition temperature (Tg) of cured solid epoxy polymer nanocomposites (PNCs) with 30.0 wt% f-Fe3O4 nanoparticles was 22.3 oC higher than that of cured pure epoxy (88.2 oC) in the dynamic mechanical analysis (DMA).1 At 50 wt% weight loss, the decomposition temperature of the cured epoxy PNCs with 30.0 wt% f-Fe3O4 nanoparticle was delayed from 421.5 (cured pure epoxy) to 483.4 oC. Compared with the tensile strength of 83.0 MPa for the cured pure epoxy,2 the enhanced tensile strength of 91.7 MPa observed in the cured epoxy PNCs with 5.0 wt% f-Fe3O4 nanoparticles is attributed to the introduced interfacial interaction between the nanoparticles and the host epoxy matrix, through the PPy nanocoating, as observed in the fracture surface. The volume resistivity of the cured epoxy PNCs with 30.0 wt% f-Fe3O4 nanoparticles decreased almost 7 orders of magnitude compared with the cured pure epoxy (1.6×1013 µΩ cm). The cured epoxy PNCs exhibited good magnetic properties; the surface functionality and epoxy polymer had little effect on the magnetic moment of the Fe3O4 nanoparticles. The cured epoxy PNCs with f-Fe3O4nanoparticles showed positive permittivity, and the permittivity increased with increasing particle loading. The role of PPy nanocoating on the nanocomposite formation mechanism was investigated by using the FT-IR and TGA tests.

(1)        Gu, H.; Guo, J.; He, Q.; Tadakamalla, S.; Zhang, X.; Yan, X.; Huang, Y.; Colorado, H. A.; Wei, S.; Guo, Z.: Flame-retardant epoxy resin nanocomposites reinforced with polyaniline-stabilized silica nanoparticles. Industrial & Engineering Chemistry Research 2013, 52, 7718-7728.

(2)        Gu, H.; Tadakamalla, S.; Zhang, X.; Huang, Y.; Jiang, Y.; Colorado, H. A.; Luo, Z.; Wei, S.; Guo, Z.: Epoxy resin nanosuspensions and reinforced nanocomposites from polyaniline stabilized multi-walled carbon nanotubes. Journal of Materials Chemistry C 2013, 1, 729-743.

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