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Nonisothermal cure kinetics of epoxy/MnxFe3-xO4 nanocomposites
Progress in Organic Coatings ( IF 3.42 ) Pub Date : 2020-01-02 , DOI: 10.1016/j.porgcoat.2019.105505
Maryam Jouyandeh; Seyed Mohammad Reza Paran; Seyed Soroush Mousavi Khadem; Mohammad Reza Ganjali; Vahideh Akbari; Henri Vahabi; Mohammad Reza Saeb

Nonisothermal cure kinetic of epoxy containing bare and Mn doped Fe3O4 nanoparticles was studied through differential scanning calorimetry (DSC). The evolution of the apparent activation energy (Eα) as a function of the extent of curing reaction was evaluated by using model-free integral Kissinger and differential Friedman isoconversional methods. Mn2+ cations in the MnxFe3-xO4 were the reason for facilitated epoxy curing reaction, as proved by a lower values of Eα obtained for the corresponding nanocomposite. Moreover, MnxFe3-xO4 nanoparticles increased the average autocatalytic reaction order from 0.48 for neat epoxy to 0.52 for epoxy/Mn-Fe3O4 nanocomposite due to the participation of hydroxyl groups on the surface of nanoparticle in epoxide ring opening. Addition of Fe3O4 and Mn-Fe3O4 nanoparticles decreased collisions between the curing moieties, as reflected in a drop in the frequency factor from ca. 18.9 for neat epoxy to 13.4 and 14.9 for epoxy nanocomposites containing 0.1 wt.% of Fe3O4 and Mn-Fe3O4, respectively.
更新日期:2020-01-04

 

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