Hyperbranched poly(ethyleneimine) physically attached to silica nanoparticles to facilitate curing of epoxy nanocomposite coatings

Ghiyasi, Samira; Sari, Morteza Ganjaee; Shabanian, Meisam; Hajibeygi, Mohsen; Zarrintaj, Payam; Rallini, Marco; Torre, Luigi; Puglia, Debora; Vahabi, Henri; Jouyandeh, Maryam; Laoutid, Fouad; Paran, Seyed Mohammad Reza; Saeb, Mohammad Reza

doi:10.1016/j.porgcoat.2018.03.019

Cited by 83 publications

(28 citation statements)

References 37 publications

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“…The broad peak appeared irrespective of sample type in the thermograms of samples, which can be considered as a double-peaked curve, where the smaller shoulder overlaps with the main temperature peak. Meanwhile, the typical autocatalytic epoxy ring opening reaction commonly leads to a unimodal exothermic peak [18,24]. Therefore, secondary reactions take place in parallel, making the cure kinetics complex [25].…”

Section: Qualitative Cure Analysismentioning

confidence: 99%

“…Although the synergistic thermal stability effects of phosphorus compounds in epoxy thermoset resins have been reported previously [17], the current understanding of cure behavior and kinetics of phosphorus-containing epoxy composites and nanocomposite coatings lags behind their rapid development in industrial applications. A comprehensive study on the contributions of nano-scale types of phosphorus materials in low concentrations is required, since the agglomeration of nanoparticles at higher loadings may prevent the cure conversion from progressing [18,19].Aluminum hypophosphite (AHP), AlPO 2 , hereafter simply referred as AHP, is a highly reactive phosphorous-based compound because it contains phosphorous at low oxidation degree. Thanks to its high reactivity, AHP has been used as a flame retardant additive for polymers [20,21] at low incorporation content.…”

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confidence: 99%

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confidence: 99%

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Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

et al. 2020

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For the first time, nano-scale aluminum hypophosphite (AlPO2) was simply obtained in a two-step milling process and applied in preparation of epoxy nanocomposites varying concentration (0.1, 0.3, and 0.5 wt.% based on resin weight). Studying the cure kinetics and thermal stability of these nanocomposites would pave the way toward the design of high-performance nanocomposites for special applications. Scanning electron microscopy (SEM) and transmittance electron microscopy (TEM) revealed AlPO2 particles having domains less than 60 nm with high potential for agglomeration. Excellent (at heating rate of 5 °C/min) and Good (at heating rates of 10, 15 and 20 °C/min) cure states were detected for nanocomposites under nonisothermal differential scanning calorimetry (DSC). While the dimensionless curing temperature interval (ΔT*) was almost equal for epoxy/AlPO2 nanocomposites, dimensionless heat release (ΔH*) changed by densification of polymeric network. Quantitative cure analysis based on isoconversional Friedman and Kissinger methods gave rise to the kinetic parameters such as activation energy and the order of reaction as well as frequency factor. Variation of glass transition temperature (Tg) was monitored to explain the molecular interaction in the system, where Tg increased from 73.2 °C for neat epoxy to just 79.5 °C for the system containing 0.1 wt.% AlPO2. Moreover, thermogravimetric analysis (TGA) showed that nanocomposites were thermally stable.

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Section: Qualitative Cure Analysismentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

et al. 2020

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“…It is also predicted that the presence of triazine hydrazide on the silica filler will promote their adhesion with the steel surface by chelation of amine lone pairs and Fe with coordination bonds [41]. It has been previously reported that modification of silica with hyperbranched poly (ethyleneimine) may increase their adhesion characteristics of the epoxy resin through the physically interaction of hydroxyl groups of silica that chemically react with the epoxide groups [42]. The interfacial adhesion bonds of SG, AS, STHc and STHa with epoxy networks and steel surfaces was examined from pull-off hydrolytic tester.…”

Section: Adhesion and Mechanical Properties Of Epoxymentioning

confidence: 99%

Functionalization of Silica with Triazine Hydrazide to Improve Corrosion Protection and Interfacial Adhesion Properties of Epoxy Coating and Steel Substrate

et al. 2020

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The chemical bonding of modified filler surfaces with coating networks is an advanced approach for improving the interfacial adhesion force of fillers with coating and substrate surfaces. In this respect, silica gel surfaces were activated and modified by grafting 1,3–dihydrazide-2,4,6-triazine onto hydroxyl groups of activated silica surfaces. The chemical structure, thermal stability and surface morphologies of the modified silica were investigated. The modified silica fillers were blended during the curing of the epoxy resin with the polyamine hardener. The data regarding the chemical structure and thermal stability of the cured epoxy networks in the presence of modified silica elucidated the chemical bonding of amine groups on the silica surfaces cured with the oxirane epoxy resin. Moreover, the incorporation of modified silica in surfaces with epoxy networks improved their adhesion with steel surfaces and enhanced the mechanical, thermal and anticorrosion characteristics of the epoxy to protect steel surfaces against seawater.

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“…Kissinger–Akahira–Sunose kinetics model is an integral form of the isoconversional methods, which can make possible the prediction of the activation energy of the reaction by using the following relation :

italicln ((), \frac{β_{i}}{T_{α, i}^{1.92}}) = italicConst . - 1.0008 ((), \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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Hyperbranched poly(ethyleneimine) physically attached to silica nanoparticles to facilitate curing of epoxy nanocomposite coatings

Cited by 83 publications

References 37 publications

Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

Functionalization of Silica with Triazine Hydrazide to Improve Corrosion Protection and Interfacial Adhesion Properties of Epoxy Coating and Steel Substrate

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

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