Abstract
In this work, the curability of epoxy nanocomposite consisting of Zn-Al layered double hydroxide (LDH) intercalated with carbonate anion (CO3) was studied via nonisothermal differential scanning calorimetry (DSC) by the aid of Cure Index (CI). The hydrothermal-assisted constant pH coprecipitation method was used in synthesis of lamellar LDH and the resulting structure was confirmed by FTIR, XRD and TGA/DTGA analyses. From the CI point of view, the cure state of epoxy/Zn-A-CO3-LDH nanocomposite was Poor at heating rates of 2 (low) and 10 (high) ºC/min. By contrast, crosslinking of epoxy resin was facilitated in the presence of Zn-Al-CO3-LDH at intermediate heating rates of 5 and 7 °C/min due to intensified ring opening reaction of epoxy under the Lewis acid effect of Zn metal, which changed the cure label of epoxy/Zn-Al-CO3-LDH nanocomposite from Poor to Excellent.
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