Transparent nanocomposite coatings based on epoxy and layered double hydroxide: Nonisothermal cure kinetics and viscoelastic behavior assessments

Rastin, Hadi; Saeb, Mohammad Reza; Nonahal, Milad; Shabanian, Meisam; Vahabi, Henri; Formela, Krzysztof; Gabrion, Xavier; Seidi, Farzad; Zarrintaj, Payam; Sari, Morteza Ganjaee; Laheurte, Pascal

doi:10.1016/j.porgcoat.2017.09.003

Cited by 79 publications

(30 citation statements)

References 46 publications

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“…where A shows the pre-exponential factor, R is the universal gas constant and E α indicates the activation energy of the thermal decomposition reactions. Due to the intricacy of polymers decomposition process, a single equation cannot signify the mechanism by which the polymer degrades across the whole temperature range [32][33][34][35]. Therefore, the model-free isoconversional method comes forth to study this complicated procedure, according to which the temperature dependency of thermal decomposition rate function is considered at a constant degree of degradation.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

et al. 2020

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A polyurethane (PU)-based powder coating reinforced with vinyltrimethoxysilane (VTMS)-functionalized ZrO 2 nanoparticles (V-ZrO 2 ) for thermal stability was developed. Chemical structure, microstructure and thermal degradation kinetics of the prepared coatings were investigated. The peak of aliphatic C-H vibrating bond in the Fourier transform infrared (FTIR) spectrum of V-ZrO 2 was a signature of VTMS attachment. Scanning electron microscopy (SEM) images reveled that, by increase of V-ZrO 2 content from 0.1 to 0.3 wt.% and then 0.5 wt.%, some agglomerations of nanoparticles are formed in the PU matrix. Thermogravimetric analysis (TGA) of the PU/V-ZrO 2 powder coatings was performed at different heating rates nonisothermally to capture alteration of activation energy (E a ) of degradation of PU/V-ZrO 2 powder coatings as a function of partial mass loss by using Friedman, Kissinger-Akahira-Sunose (KAS), Ozawa-Wall-Flynn (FWO) and modified Coats-Redfern isoconversional approaches. It was observed that by addition of 1 wt.% V-ZrO 2 to PU resin the early state degradation temperature at 5% weight loss increased about 65 • C, suggesting a physical barrier effect limiting the volatility of free radicals and decomposition products. Incorporation of 5 wt.% ZrO 2 led to about 16% and 10% increase in E a and LnA of blank PU, respectively, which was indicative of higher thermal resistance of nanocomposite powder coatings against thermal degradation. There was also obvious agreement between model outputs and experimental data. The results reveal that nanocomposite coating shows superior thermal properties compared to neat PU powder coatings, and the presence of nano ZrO 2 in sufficient amount causes retardation of the thermal decomposition process.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

et al. 2020

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“…The model-free isoconversional approach is used to study polymer decomposition mechanism due to its complexity, which prevents the use of a single equation across the whole temperature range. [54][55][56][57] By considering the model-free isoconversional method, the thermal decomposition rate is assumed to be only function of temperature at a constant degree of degradation.…”

Section: Thermal Decomposition Characterizationmentioning

confidence: 99%

Silane‐functionalized Al₂O₃‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights

Hadavand

Jouyandeh

Paran

et al. 2020

J of Applied Polymer Sci

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This work reports on nonisothermal degradation kinetics of polyurethane (PU)‐based powder coatings containing 1, 3, and 5%wt% vinyltrimethoxysilane functionalized Al2O3 (V‐Al2O3) nanoparticles. Thermogravimetric analysis of PU/V‐Al2O3 powder coatings with different V‐Al2O3 contents has been performed at different heating rates. Variation of activation energy (Ea) of PU/V‐Al2O3 powder coatings was modeled as a function of partial mass loss by using Kissinger–Akahira–Sunose, Ozawa–Wall–Flynn and modified Coats–Redfern isoconversional approaches. The results revealed hindered decomposition process of PU/V‐Al2O3 nanocomposite powder coatings, featured by an increase in activation energy of degradation from ∼158 for blank PU to 225, 183, and 229 kJ/mol for nanocomposites filled with 1, 3, and 5 wt% of V‐Al2O3, respectively. Likewise, pre‐exponential factor values increased for samples containing V‐Al2O3 nanoparticles compared to that of blank sample. Sestak–Berggren kinetic model appropriately captured thermal degradation behavior of PU/V‐Al2O3 nanocomposites than that of nth order decomposition kinetic reaction models.

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“…In a recent work, we comprehensively explained the methodology and applied it for a very complex case containing a thermoplastic, a rubber, and a nanoparticle . Two mathematical approaches are generally applied in finding kinetic parameters from thermogravimetric or differential calorimetric data, and the model‐fitting and model‐free (isoconversional) approaches. TGA measurements can be performed under isothermal or nonisothermal conditions.…”

Section: Theoretical and Experimental Analysesmentioning

confidence: 99%

“…The isoconversional Ozawa–Flynn–Wall method is another integral method for the calculation of E α from the slope of ln(β i ) with respect to 1/T α at any certain partial mass loss . This method is defined as the following equation:

italicln ((), β_{i}) = italicConst - 1.052 ((), \frac{E_{α}}{{RT}_{α}})

…”

Section: Theoretical and Experimental Analysesmentioning

confidence: 99%

Triple‐faced polypropylene: Fire retardant, thermally stable, and antioxidative

Vahabi

Paran²,

Shabanian

et al. 2019

Vinyl Additive Technology

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A halogen‐free nitrogen‐rich additive was used to make polypropylene (PP) prepared for three different missions: fire retardancy, thermal stability, and antioxidative properties. The prepared additive was composed of a cyclodextrin, a nanohydroxyapatite, and a poly[[6‐[(1,1,3,3,‐tetramethylbutyl)amino]‐1,3,5‐triazine‐2,4‐diyl][(2,2,6,6‐tetramethyl‐4‐piperidinyl)imino]‐1,6‐hexanediyl[2,2,6,6‐tetramethyl‐4‐piperidinyl)imino] (SABO®STAB) integrated into a unique molecule, namely, BSDH. Fire retardancy performance of BSDH in PP was compared with that of 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) commercially available additive in terms of cone calorimeter results. Thermal stabilities of PP/BSDH and PP/DOPO composites were compared by changes observed in pyrolysis activation energy values measured in thermogravimetric analysis under nitrogen atmosphere at various heating rates. Flame retardancy of PP/BSDH composite was reflected in a drop in the peak of Heat Release Rate by ca. 31% with respect to neat PP. Very interestingly, the results show that BSDH additive retarded thermal oxidation of PP macromolecular chains when compared with DOPO commercially available flame retardant, as signaled by a rise in oxidation induction time value as well as an increased early‐stage activation energy needed for thermal decomposition of PP in the presence of BSDH. J. VINYL ADDIT. TECHNOL., 25:366–376, 2019. © 2019 Society of Plastics Engineers

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Transparent nanocomposite coatings based on epoxy and layered double hydroxide: Nonisothermal cure kinetics and viscoelastic behavior assessments

Cited by 79 publications

References 46 publications

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

Silane‐functionalized Al₂O₃‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights

Triple‐faced polypropylene: Fire retardant, thermally stable, and antioxidative

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Transparent nanocomposite coatings based on epoxy and layered double hydroxide: Nonisothermal cure kinetics and viscoelastic behavior assessments

Cited by 79 publications

References 46 publications

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

Silane‐functionalized Al2O3‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights

Triple‐faced polypropylene: Fire retardant, thermally stable, and antioxidative

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Silane‐functionalized Al₂O₃‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights