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Imidazole-Functionalized Nitrogen-Rich Mg-Al-Co3 Layered Double Hydroxide for Developing Highly Crosslinkable Epoxy With High Thermal and Mechanical Properties Publisher



Seidi F1 ; Jouyandeh M2, 3 ; Paran SMR2 ; Esmaeili A4 ; Karami Z2 ; Livi S5 ; Habibzadeh S6 ; Vahabi H3 ; Ganjali MR2, 7 ; Saeb MR3
Authors

Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects Published:2021


Abstract

Ionic liquid-based N-octadecyl-N'-octadecyl imidazolium iodide functionalized layered double hydroxide (LDH-IM) was synthesized for manufacturing high-performance epoxy nanocomposites. Nonisothermal differential scanning calorimetry (DSC) was performed to study cure kinetics of epoxy reinforced قث with LDH and LDH-IM. Incorporation of Mg-Al-CO3 LDH into epoxy hindered the curing reaction, as detected by dimensionless Cure Index (CI). By contrast, epoxy/LDH-IM cured Good and Excellent due to imidazolium ionic liquid. Higher activation energy for completely cured epoxy/LDH-IM nanocomposite was obtained compared to epoxy and epoxy/LDH nanocomposites. The curing reaction rate was obtained by calculation of the orders of instantaneous autocatalytic and non-catalytic reactions, and optimal kinetic parameters based on isoconversional methods were in good agreement with experimental cure reaction rates. Lower value of Tg for epoxy/LDH nanocomposite compared to the neat epoxy signified weak interactions between Mg-Al-CO3-LDH and epoxy matrix, while a higher Tg was obtained for epoxy/LDH-IM. Network degradation kinetics of the samples was also investigated. The higher decomposition activation energy for epoxy/LDH-IM approved strong interfacial adhesion in the assigned system. The highly reactive nature of the developed LDH-IM gives reason for its usage for developing highly curable epoxy with high thermal and mechanical properties. © 2020 Elsevier B.V.
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