Naslov
Thermal properties of epoxy resin/layered double hydroxide intercalated nanocomposites

Autori
Brnardić, Ivan ; Matusinović, Zvonimir ; Šipušić, Juraj ; Macan, Jelena

Izvornik
Polimeri : časopis za plastiku i gumu (0351-1871) 33 (2012), 2; 52-57

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
epoxy resin ; intercalated nanocomposite ; layered double hydroxyde (LDH) ; morphology ; thermal properties

Sažetak
Ca-Al layered double hydroxide (LDH) modified 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 final layered structure. Intercalation of benzoate anions within LDH layers was confirmed 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 polyoxypropylene diamine as a curing agent. Nanocomposites prepared with different contents of the LDH-B (5, 10 and 15 phr) were characterised by XRD, FTIR, TGA, differential scanning calorimetry and transmission electron microscopy (TEM). XRD results indicated formation of intercalated nanocomposites, and TEM analysis confirmed that LDH-B was dispersed within the matrix forming an intercalated structure, which becomes partially exfoliated in the nanocomposite with 5 phr filler. Results of thermal analysis showed detrimental influence on initial degradation temperature in comparison to the neat crosslinked epoxy, while residue at 1000 °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.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Temeljne tehničke znanosti

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