Cure Kinetics of Epoxyurethane Compositions with Amine Hardeners of Various Nature

Bratasyuk, Nikita A.; Zuev, V. V.

doi:10.1134/s1070427220100043

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…Also, unreacted hydroxyl groups on the nano-silica surface can affect the curing reaction by accelerating the curing reaction and increasing the degree of the cure. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] Figure 12((a) and (b)) shows the morphology of the fracture surface of DGEBA/DDS/AMNP (A) and DGEBA/DDS/EMNP (B) systems. In Figure 13(b), the particle distribution in the epoxy matrix is more homogeneous than in Figure 13(a) and the accumulation of nanoparticles is less visible.…”

Section: Linear Integral Non-isothermal Methodsmentioning

confidence: 99%

“…35 The characteristic bands located at 3300-3500 cm �1 and 1620-1660 cm �1 were assigned to the stretching and bending vibrations of aliphatic amine (N-H) groups, respectively. [24][25][26][27][28][29][30][31][32][33][34][35][36] However, the absorption bands at *3450 cm �1 and *1635 cm �1 are also related to the stretching and bending vibrations of Si-OH groups, so that those absorption peaks cannot be distinguished. The presence of the anchored propyl group was confirmed by C-H stretching vibrations that appeared at 2920 and 2852 cm �1 .…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

“…Epoxy-iron oxide nanocomposites were formulated through the dispersion of modified iron oxide nanoparticles in the epoxy resin matrix and cured with diaminodiphenylsulfone (DDS) as a curing agent. The effect of the NPs on kinetic parameters of the curing process was determined by the non-isothermal technique of differential scanning calorimetry (DSC) using several non-isothermal kinetic methods, including Kissinger-Akahira-Sunose (KAS) method, [26][27][28][29] Kissinger method, [29][30][31][32] Straink method, [29][30][31][32][33] Flynn-Wall-Ozawa (OFW) method [29][30][31][32] and Bosewell method. 29 The glass transition temperature of the cured resin was determined using DSC and the surface morphology of nanocomposites and dispersion of the nanoparticles was observed using scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

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Preparation and non-isothermal cure kinetics study of epoxy resin nanocomposites with amine and epoxy functionalized magnetic nanoparticles

Shahrestanaki

Mehrshad

Akhlaghi

2021

High Performance Polymers

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Amine-functionalized magnetic nanoparticles NiFe2O4@SiO2@Amine (AMNP), and epoxy functionalized magnetic nanoparticles, CuFe2O4@SiO2@Epoxy (EMNP) were synthesized in three steps. Homogeneous stable dispersion of AMNP and EMNP, at concentrations of 1, 5, 10, 15, 20 wt% in epoxy resin were prepared using stoichiometric amounts of 4,4’-diaminodiphenylsulfone (DDS) as a curing. The optimum ratio of AMNP and EMNP were found to be 5%, and these were investigated by the total enthalpy of the curing reaction using differential scanning calorimetry (DSC) thermograms at 10°C/min. The cure kinetics of epoxy resin-functional magnetic nanoparticles-DDS composites were studied using non-isothermal DSC thermograms at different heating rates (5, 10, 15, 20°C/min). The kinetic parameters of the curing process, such as activation energy ( Ea), pre-exponential factor ( A), and rate constant ( k) were determined using several non-isothermal kinetic methods: Kissinger-Akahira-Sunose (KAS), Kissinger, Straink, Flynn-Wall-Ozawa (OFW), and Bosewell. The kinetic curing values obtained with different kinetic methods are well-matched. The Ea values were calculated in the range of 59.80 to 65.94, 57.69 to 63.92, and 45.38 to 52.45 kJ.mol−1 for the DGEBA/DDS, DGEBA/DDS/AMNP, and DGEBA/DDS/EMNP systems respectively. Also, The A values, using the Kissinger method, were calculated to be in the range of 7.0 × 105, 4.0 × 105, and 0.2 × 105 S−1 for the DGEBA/DDS, DGEBA/DDS/AMNP, and DGEBA/DDS/EMNP systems respectively. The glass transition temperatures of cured resins were determined with DSC, and the surface morphology of the nanocomposites and also the dispersion of the nanoparticles were investigated using scanning electron microscopy (SEM).

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