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Molecules 2018, 23(5), 1075; https://doi.org/10.3390/molecules23051075

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

1
School of Materials Science and Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China
2
Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ashok Kakkar
Received: 31 March 2018 / Revised: 28 April 2018 / Accepted: 29 April 2018 / Published: 3 May 2018
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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 lamellas with almost exfoliated structures. The improved morphology and barrier property confirmed the superiority of the adduct, which provides a general method for developing gas barrier nanocomposites. View Full-Text
Keywords: epoxy-diamine adduct; layered silicate; nanocomposite; small-angle neutron scattering; gas barrier property epoxy-diamine adduct; layered silicate; nanocomposite; small-angle neutron scattering; gas barrier property
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wei, R.; Wang, X.; Zhang, X.; Chen, C.; Du, S. 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 2018, 23, 1075.

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