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Synthesis of a Fe3O4 Nanosphere@Mg–Al Layered-Double-Hydroxide Hybrid and Application in the Fabrication of Multifunctional Epoxy Nanocomposites
- Kalali, Ehsan
Naderi, Wang, Xin, Wang, De-Yi
- Industrial & Engineering Chemistry Research 2016 v.55 no.23 pp. 6634-6642
- X-ray diffraction, engineering, epoxides, heat, iron oxides, nanoparticles, phytic acid, polymer nanocomposites, polymers, smoke, sodium, thermal conductivity, transmission electron microscopy
- Layered double hydroxide (LDH) is regarded as a prominent flame-retardant nanoadditive for polymers. However, the flame-retardant efficiency of a LDH depends strongly on its dispersion state and composition. Usually, modification or functionalization of a LDH is crucial to obtaining high-performance polymer nanocomposites. In order to develop multifunctional epoxy nanocomposites, in this study a LDH was first modified by biobased flame-retardant species, phytic acid (Ph) and (hydroxypropyl)sulfobutyl-β-cyclodextrin sodium (CDBS), and subsequently decorated by Fe₃O₄ nanoparticles to obtain a Fe₃O₄ nanosphere@LDH hybrid. Results obtained from size distribution and transmission electron microscopy revealed that the Fe₃O₄ nanoparticles with an average size of 8 nm were well decorated on the LDH platelet. The Fe₃O₄-decorated LDH hybrids facilitated their dispersion within an epoxy matrix, as indicated in X-ray diffraction. The incorporation of an as-prepared Fe₃O₄@Ph-CDBS-LDH hybrid into epoxy resin (EP) not only improved the flame-retardant properties but also endowed EP with increased thermal conductivity. Specifically, the peak heat release rate and total smoke production of the EP composite with 8 wt % Fe₃O₄@Ph-CDBS-LDH were decreased by 55% and 34%, respectively, in comparison to those of pristine EP, and the UL-94 V0 rating requirement can be met. The investigation provides a promising approach for the preparation of multifunctional LDH hybrids and related high-performance polymer nanocomposites by just using a functionalized nanomaterial.