Polyurethane Nanocomposites Containing Reduced Graphene Oxide, FTIR, Raman, and XRD Studies

Strankowski, Michał; Włodarczyk, Damian; Piszczyk, Łukasz; Strankowska, Justyna

doi:10.1155/2016/7520741

Cited by 199 publications

(127 citation statements)

References 23 publications

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“…Meanwhile, the characteristic functional groups of DOPO, such as P─Ph, P═O, P─O─Ph, appear at 1476, 1246, 757 cm −1 in the DOPO‐LDH spectrum . In addition, the band appeared about at 1205 cm −1 was assigned to the stretching vibration peak of C─O─C of KH‐560 . It was worth noting that in the DOPO‐LDH spectrum, new diffraction peaks appear at 1060 cm ‐1 , which could be the Si─O─Si bond generated by the self‐crosslinking of the coupling agent, and the P─H stretch vibration peak of DOPO at 2436 cm −1 disappeared.…”

Section: Resultsmentioning

confidence: 97%

“…[37][38][39] In addition, the band appeared about at 1205 cm −1 was assigned to the stretching vibration peak of C─O─C of KH-560. 40 It was worth noting that in the DOPO-LDH spectrum, new diffraction peaks appear at 1060 cm -1 , which could be the Si─O─Si bond generated by the self-crosslinking of the coupling agent, 41 and the P─H stretch vibration peak of DOPO at 2436 cm −1 disappeared. As a result, it can be proved that silane coupling agent has occured selfcrosslinking reaction and DOPO has been grafted onto the LDH.…”

Section: Ftir Analysismentioning

confidence: 97%

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A flame‐retardant DOPO‐MgAl‐LDH was prepared and applied in poly (methyl methacrylate) resin

Meng

Leng

et al. 2019

Polymers for Advanced Techs

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A novel inorganic and organic composite flame retardant (9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide [DOPO]–layered double hydroxide [LDH]) was synthesized via grafting DOPO with organic‐modified Mg/Al‐LDH, which was introduced into poly (methyl methacrylate) (PMMA) resin to prepare the flame‐retardant PMMA composites. Thermogravimetric analyzer (TGA) showed that the T‐50% of DOPO‐LDH/PMMA composites enhanced by about 20°C, and with the 20% flame retardant, the residual char content can be increased by 39.8% in the air atmosphere compared with LDH/PMMA composites. In the UL‐94 and the limiting oxygen index (LOI) tests, it can be found that compared with LDH/PMMA composites, the LOI value of DOPO‐LDH/PMMA composites were raised evidently with the increased flame retardants, and the droplet combustion was greatly improved. These results could be ascribed to the action of DOPO free‐radical, catalytic charring of polymer and the effect of LDH physical barrier. Moreover, the novel DOPO‐LDH not only given PMMA a good flame‐retardant property and thermal stability, but also have higher visible light transmittance, ultraviolet‐shielding effect, and low loss of mechanical properties, which could further facilitate the wide application of inorganic environment‐friendly flame retardants in general resins and engineering resins and broaden the application of polymers.

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Section: Resultsmentioning

confidence: 97%

Section: Ftir Analysismentioning

confidence: 97%

A flame‐retardant DOPO‐MgAl‐LDH was prepared and applied in poly (methyl methacrylate) resin

Meng

Leng

et al. 2019

Polymers for Advanced Techs

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“…Bands in the region between 1150 and 1000 cm −1 correspond to the CO stretch owing to the presence of rGO in the LDPE. When the amount of rGO increased, the intensity of the CO stretch bands of the nanocomposites became stronger …”

Section: Resultsmentioning

confidence: 99%

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Toh

Ong

Bindumadhavan

et al. 2018

Polymer International

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The variation in physicochemical properties on incorporation of unmodified reduced graphite oxide (rGO) into a low‐density polyethylene (LDPE) matrix has received much attention. Herein, a simple method is developed for the fabrication of LDPE/rGO nanocomposites using a solvent casting method. The UV‐visible spectra showed that addition of rGO can effectively cut off the short‐wavelength UV‐B light, which resists the occurrence of photoreaction. The stiffness of the LDPE/rGO nanocomposites was improved by 45% with an increase of modulus of elasticity as the rGO content increases. This is slightly opposite to the small decrease of the nanocomposite tensile strength. The addition of rGO to LDPE improved the thermal stability and degree of crystallization of LDPE/rGO nanocomposites when the rGO content increases from 0.025 to 1 wt%. The gas barrier property was also improved by 26% with 0.3 wt% of rGO. The dielectric property of the LDPE/rGO nanocomposites was also evaluated for industrial electronics application and the dielectric constant increases 50% compared with the neat LDPE when 0.1–1 wt% rGO was added. Results obtained clearly indicate the feasibility of using unmodified rGO to improve the properties of LDPE matrix for meeting the performance requirements for intended use in packaging industries. © 2018 Society of Chemical Industry

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“…Raman spectra of 98 PU‐2.0 vol% GrF is not included as it has more PU coating on GrF surface, which makes it difficult for graphene signature to be detected. Figure f presents Raman spectra of PU, where typical PU signature peaks at 1,172, 1,278, 1,461, 1,581, 1,612, and 1,724 cm −1 are recognized . Graphene structural fingerprints in Fig.…”

Section: Resultsmentioning

confidence: 99%

Multi‐scale damping of graphene foam‐based polyurethane composites synthesized by electrostatic spraying

et al. 2018

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An electrostatic spraying technique was used to synthesize 3D graphene foam (GrF)‐reinforced polyurethane (PU) composites. Glass transition temperature (Tg) of PU increased from 120 to 148 °C after 3.3 vol% GrF addition. Strong interfacial bonding accounts for the improvement in Tg of PU‐GrF composites. Energy dissipation behavior is probed at multiple load scales to examine the intrinsic and structural damping characteristic. Micro‐scale damping at 1 mN and 1,000 Hz exhibited loss tangent value (tan δ), which is 200% higher and 3 times faster than PU. Nano dynamic mechanical analysis of PU‐3.3 vol% GrF composite demonstrated up to 383% tan δ improvement than of PU at 5 μN dynamic load. Physical mechanisms including rippling effect and weak van der Waals forces in graphene account for the high energy dissipation of PU‐GrF composite. This study suggests that PU‐GrF nanocomposites have the potential to serve as a good damping material in vibrating systems. POLYM. COMPOS., 40:E1862–E1870, 2019. © 2018 Society of Plastics Engineers

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Polyurethane Nanocomposites Containing Reduced Graphene Oxide, FTIR, Raman, and XRD Studies

Cited by 199 publications

References 23 publications

A flame‐retardant DOPO‐MgAl‐LDH was prepared and applied in poly (methyl methacrylate) resin

A flame‐retardant DOPO‐MgAl‐LDH was prepared and applied in poly (methyl methacrylate) resin

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Multi‐scale damping of graphene foam‐based polyurethane composites synthesized by electrostatic spraying

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