Fabrication of High Gas Barrier Epoxy Nanocomposites: An Approach Based on Layered Silicate Functionalized by a Compatible and Reactive Modifier of Epoxy-Diamine Adduct

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Ran WeiShanyi Du

Abstract

To solve the drawbacks of poor dispersion and weak interface in gas barrier nanocomposites, a novel epoxy-diamine adduct (DDA) was synthesized by reacting epoxy monomer DGEBA with curing agent D400 to functionalize montmorillonite (MMT), which could provide complete compatibility and reactivity with a DGEBA/D400 epoxy matrix. Thereafter, sodium type montmorillonite (Na-MMT) and organic-MMTs functionalized by DDA and polyether amines were incorporated with epoxy to manufacture nanocomposites. The effects of MMT functionalization on the morphology and gas barrier property of nanocomposites were evaluated. The results showed that DDA was successfully synthesized, terminating with epoxy and amine groups. By simulating the small-angle neutron scattering data with a sandwich structure model, the optimal dispersion/exfoliation of MMT was observed in a DDA-MMT/DGEBA nanocomposite with a mean radius of 751 Å, a layer thickness of 30.8 Å, and only two layers in each tactoid. Moreover, the DDA-MMT/DGEBA nanocomposite exhibited the best N₂ barrier properties, which were about five times those of neat epoxy. Based on a modified Nielsen model, it was clarified that this excellent gas barrier property was due to the homogeneously dispersed la...Continue Reading

References

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Jun 3, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ayman M AttaMohamed Wahby

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Citations

Jul 10, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jin LiTatsuo Takada

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Methods Mentioned

BETA
X-ray
transmission electron microscopy
SANS
small-angle neutron scattering
neutron scattering

Software Mentioned

Mantid

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