Preparation of epoxidized novolac resin nanocomposites: Physical and chemical incorporation of modified graphene oxide layers for improvement of thermal stability

Shahi, Sina; Roghani‐Mamaqani, Hossein; Salami‐Kalajahi, Mehdi; Ebrahimi, Hamidreza

doi:10.1016/j.polymertesting.2018.04.036

Cited by 19 publications

(12 citation statements)

References 52 publications

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“…FTIR results show that alkoxysilane‐modified polyurethane‐imide samples (PUBD and PUI) were successfully synthesized . GO shows some characteristic bands at 3436, 1702, 1642, 1228, and 874–1228 cm −1 ascribed to the stretching vibrations of hydroxyl, carboxyl, C=C, C−O, and oxirane groups, respectively . After modification of GO with APTES, the two peaks at 2864 and 2930 cm −1 are assigned to the symmetric and asymmetric stretching vibrations of methylene groups, respectively.…”

Section: Resultsmentioning

confidence: 96%

Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method

et al. 2020

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Hybrid composites of graphene and polyurethane (PU) were prepared via sol-gel method. The isocyanate-terminated PUs with chain extenders of pyromellitic dianhydride (PMDA) and butanediol were reacted with (3-aminopropyl) triethoxysilane (APTES) to obtain Polyurethane with PMDA chain extender (PUI) and Polyurethane with BD chain extender (PUBD), respectively. Sol-gel reaction between the silane-modified polyurethanes with APTES-modified graphene oxide resulted in the hybrid composites with high thermal degradation temperature and char content. Results of Fourier-transform infrared spectroscopy and proton nuclear magnetic resonance analysis confirmed chemical modification of graphene and successful preparation of the bifunctional silane-modified PUI and PUBD, respectively. Based on the thermogravimetric analysis (TGA) results, PMDA chain extender resulted in higher degradation temperature and char content in the hybrid composites. In addition, siloxane networks formed by sol-gel process resulted in synergistic effects on improving thermal stability of the PU materials. X-ray diffraction results in addition to the scanning and transmission electron microscopy images confirmed successful oxidation of graphite and also its modification process.

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Section: Resultsmentioning

confidence: 96%

Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method

et al. 2020

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“…Because PR is often used as the heat‐resistant resin and thermal ablation material especially in the aerospace field, thermal stability and char yield are also very important for PR . Figure A,B show separately TGA and differential thermal gravity (DTG) curves of PR and its composites.…”

Section: Resultsmentioning

confidence: 99%

“…There are two kinds of methods to improve the performance of PR. One is to introduce new functional components to the molecular structure of PR, the other is to fill inorganic fillers into PR, such as layered silicates, carbon fiber, carbon nanotubes, graphite, and graphene, and so forth. Because the latter does not change synthesis and processing technology of PR, it has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

“…As a kind of multifunctional nanofiller, graphene can effectively improve mechanical properties, electrical, and thermal conductivities, thermal stability, and thermal ablation properties of PR . For example, Fangyuan Yuan et al reported an efficient one‐step approach to reduce and functionalize graphene oxide (GO) with PR chains (rGO‐PR) during in situ polymerization of phenol and formaldehyde for multifunctional PR/rGO‐PR composites.…”

Section: Introductionmentioning

confidence: 99%

“…At 2.15 wt% rGO loading, the compressive strength of the composite (441.11 MPa) increases by 14.24% compared with that of pure PR (386.13 MPa), and σ of the composite reaches 2.73 S·cm −1 . In addition to this work, most researchers have recently focused on the effect of rGO and its derivatives on the thermal properties of PR . It turns out that some rGO hybrids (such as rGO/silica, rGO/Mg) can significantly improve the residual char yield and decomposition temperature of PR.…”

Section: Introductionmentioning

confidence: 99%

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An alternative avenue for high‐performance phenolic resin/graphene composite

et al. 2019

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Phenolic resin (PR) grafted graphene (G-PR), synthesized from the versatile graphene modification platform 2-(3, 4-dihydroxyphenyl) pyrrolidine grafted pristine graphene (G-OH), is used to develop high-performance phenolic composites. Benefiting from good properties of G-PR, uniform dispersion of G-PR and strong PR/G-PR interfacial interaction, G-PR shows obvious advantages as a filler in improving mechanical, electrical, and thermal properties of PR over pristine graphene (pG) and graphene oxide (GO) derivatives. For PR/G-PR composites, the maximum tensile strength attains 51.4 MPa at 0.5 wt% graphene content. Electrical and thermal conductivities reach to 10 −3 SÁcm −1 and 0.374 WÁm −1 Ák −1 at 5 wt% graphene content, respectively. The decomposition temperature and residue at 800 C separately increase by 61 C and 3.5 wt% at 1 wt% graphene content. In a word, this contribution provides an alternative avenue for preparing high-performance and multifunctional PR/graphene composites, avoiding the high risk and serious pollution of graphene oxide (GO) avenue.

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Synthesis, thermal stability, and degradation kinetics of a novel boron‐containing novolac based on triphenyl borate

Huang,

Zhai,

Lai

et al. 2024

Int J of Chemical Kinetics

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A novel boron‐containing novolac (triphenyl borate‐formaldehyde resin, TPBF) was synthesized. The structure, thermoplasticity, molecular weight, and molecular weight distribution of TPBF have been characterized with FT‐IR, melt viscosity, 13C NMR and GPC. The thermal stability of TPBF was investigated by TGA, indicating the thermal stability of TPBF was much better than that of normal novolac (phenol‐formaldehyde resin, PF). TPBFs with different molar ratios of formaldehyde to benzene ring in triphenyl borate (TPB) were also synthesized and compared for molecular size, polydispersity and thermal stability. Further, the thermal degradation kinetics of TPBFs and PF were studied by TGA using Madhusdanan‐Krishnan‐Ninan method and the activation energies were calculated at different degradation stages. It was found that the thermal degradations of TPBFs and PF are a multistage reaction and the degradation reactions in every stage follow the first order reaction mechanism. Finally, the activation energies of thermal degradations of novolac increase with the introduction of boron, the progress of degradation reaction as well as the increase of molar ratios.

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Preparation of epoxidized novolac resin nanocomposites: Physical and chemical incorporation of modified graphene oxide layers for improvement of thermal stability

Cited by 19 publications

References 52 publications

Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method

Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method

An alternative avenue for high‐performance phenolic resin/graphene composite

Synthesis, thermal stability, and degradation kinetics of a novel boron‐containing novolac based on triphenyl borate

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