Original scientific paper

Thermal Properties of Epoxy Resin/Layered Double Hydroxide Intercalated Nanocomposites

Ivan BRNARDIĆ ; Faculty of Metallurgy, University of Zagreb, Zagreb
Zvonimir MATUSINOVIĆ ; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Juraj ŠIPUŠIĆ ; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Jelena MACAN orcid.org/0000-0003-0614-194X ; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb

Abstract

Ca-Al layered double hydroxide (LDH) modifi ed by the incorporation of benzoate anions (Ca4Al2(OH)12(C6H5COO)2 · x H2O, LDH-B) was prepared by a variation of the rehydration method, by adding benzoic acid and CaO into a mixture of water and acetone used to convert tricalcium aluminate (Ca3Al2O6) into fi nal layered structure. Intercalation of benzoate anions within LDH layers was confi rmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Intercalated nanocomposites based on an epoxy resin and LDH-B were prepared by in situ polymerisation, with poly(oxypropylene) diamine as a curing agent. Nanocomposites prepared with different contents of LDH-B (5, 10 and 15 phr) were characterised by XRD, FTIR, TGA, differential scanning calorimetry and transmission electron microscopy (TEM). The XRD results indicated formation of intercalated nanocomposites, and TEM analysis confi rmed that LDH-B was dispersed within the matrix forming an intercalated structure, which becomes partially exfoliated in the nanocomposite with 5 phr fi ller. Results of thermal analysis showed detrimental infl uence on initial degradation temperature in comparison to the neat crosslinked epoxy, while residue at 1,000°C increases, especially for the partially exfoliated nanocomposite. The glass transition temperature decreases in comparison with the neat crosslinked epoxy, indicating poorer crosslinking of the epoxy matrix.

Keywords

epoxy resin; intercalated nanocomposite; layered double hydroxide (LDH); morphology; thermal properties

Hrčak ID:

97713

URI

https://hrcak.srce.hr/97713

Publication date:

27.2.2013.

Article data in other languages: croatian

Visits: 3.014 *