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Epoxy/Layered Double Hydroxide (Ldh) Nanocomposites: Synthesis, Characterization, and Excellent Cure Feature of Nitrate Anion Intercalated Zn-Al Ldh Publisher



Karami Z1, 2 ; Jouyandeh M1, 2 ; Ali JA3 ; Ganjali MR1, 4 ; Aghazadeh M1 ; Paran SMR1 ; Naderi G5 ; Puglia D6 ; Saeb MR7
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Authors Affiliations
  1. 1. Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
  2. 2. Advanced Materials Group, Iranian Color Society (ICS), P.O. Box 1591637144, Tehran, Iran
  3. 3. Department of Petroleum Engineering, Faculty of Engineering, Soran University, Kurdistan Region, Iraq
  4. 4. Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Department of Polymer Processing, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran
  6. 6. University of Perugia, Department of Civil and Environmental Engineering, Strada di Pentima 4, Terni, 05100, Italy
  7. 7. Department of Resin and Additives, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran

Source: Progress in Organic Coatings Published:2019


Abstract

Layered double hydroxides (LDHs) belong to two-dimensional (2D) nanoparticle family. Best known as anionic clays, LDHs were the promising choice for a wide range of applications. Despite the widespread research on synthesis and application of LDH as an additive in thermoset resins, a few was known about its curing ability. In this work, Zn-Al LDH intercalated with nitrate anion (Zn-Al-NO3) was synthesized, characterized and incorporated into epoxy resin at low content of 0.1 wt.%. Fourier-transform infrared spectrophotometry (FTIR), X-ray diffractometry (XRD), and thermogravimetric analysis (TGA/DTG) techniques were employed to characterize LDH. Nonisothermal differential scanning calorimetry (DSC) at different heating rates allowed for evaluating curing state of epoxy/Zn-Al-NO3 LDH nanocomposites containing 0.1 wt.% of LDH in terms of Cure Index universal criterion. Zn-Al-NO3 LDH assisted epoxy in curring with an amine precursor resulting in much more heat release in a shorter curing temperature interval with respect to the blank epoxy system whatever heating rate. Such promising feature was signaled by Excellent cure state demonstrated by Cure Index, which was attributed to Lewis acid effect of Zn that catalyzed epoxy curing reaction. Moreover, it was discussed that an enlarged LDH interlayer space brought about by incorporation of nitrate anion between layers facilitated the curing reaction. © 2019 Elsevier B.V.
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