Repozytorium publikacji - Politechnika Gdańska

Nonisothermal calorimetric and isothermal rheokinetic analyses were used to study cure kinetics of epoxy/anhydride systems containing very low concentration of pristine and amine-functionalized multiwalled carbon nanotubes (MWCNTs). Isoconversional methods were applied in calorimetric modeling of cure kinetics. Eα vs. α dependency and autocatalytic nature of curing were identified for both types of nanocomposites by isoconversional models. Fall in Eα value from 90 to 82.5 kJ mol−1 thanks to amine functionalization (with Eα of blank epoxy/anhydride of 80.3 kJ mol−1) was indicative of high potential of nanocomposites to cure at low concentration of functionalized MWCNTs (0.1 g with respect to 100 g of resin). Times of gelation and vitrification of epoxy were measured using storage and loss modulus data provided by isothermal rheokinetic analysis, showing a drop upon attachment of amine groups to MWCNTs. In complete agreement with nonisothermal calorimetric studies, variation of storage and loss modulus of nanocomposites confirmed hindered/accelerated cure devoted to pristine/amine-functionalized MWCNTs.

Autorzy

• Mohammad Saeb,
• Hadi Rastin,
• Milad Nonahal,
• Mehdi Ghaffari,
• Ali Jannesari,
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