Effect of functionalized graphene oxide with hyperbranched POSS polymer on mechanical and dielectric properties of cyanate ester composites

Zhang, Mengmeng; Yan, Hongxia; Yuan, Lingxia; Liu, Chao

doi:10.1039/c6ra01053a

Cited by 34 publications

(15 citation statements)

References 57 publications

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“…The narrow-range XPS of C 1s in GOTESFe is shown in Figure S3b, where an expansive peak from 282 eV to 289 eV is noticeable. It is noteworthy that there is an absence of peaks in the C 1s spectrum of GOTESFe corresponding to the non-oxygenated ring C atoms, C–OH, C–O–C, and C atoms in carboxyl groups, a clear indication of the successful surface functionalization of graphene oxide nanosheets with Fe 3 O 4 , APTES, and FeL. , …”

Section: Resultsmentioning

confidence: 98%

“…It is noteworthy that there is an absence of peaks in the C 1s spectrum of GOTESFe corresponding to the nonoxygenated ring C atoms, C−OH, C−O−C, and C atoms in carboxyl groups, a clear indication of the successful surface functionalization of graphene oxide nanosheets with Fe 3 O 4 , APTES, and FeL. 59,61 The magnetic measurements of Fe 3 O 4 and GOTESFe have been executed at room temperature, and the results are shown in Figure S4. The specific saturation magnetization (M s ) values for Fe 3 O 4 and GOTESFe are 63.29 and 26.466 emu g −1 , respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Iron Complexes Anchored onto Magnetically Separable Graphene Oxide Sheets: An Excellent Catalyst for the Synthesis of Dihydroquinazoline-Based Compounds

Chakraborty

Chowdhury

Menéndez³

et al. 2020

ACS Appl. Mater. Interfaces

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In this work, a green, sustainable, and efficient protocol for the syntheses of dihydroquinazoline derivatives is proposed. Initially, three Schiff base complexes of iron containing the ligand (2,2-dimethylpropane-1,3-diyl)bis(azanylylidene)bis(methanylylidene)bis(2,4-Xphenol), where X = Cl (complex 1)/Br (complex 2)/I (complex 3), were synthesized, fully characterized, and used in the desired syntheses. Complex 1 excelled as a catalyst, closely followed by complexes 2 and 3. DFT calculations helped in rationalizing the role of the halide substituent in the ligand backbone as a relevant factor in the catalytic superiority of complex 1 over complexes 2 and 3 for the synthesis of the dihydroquinazoline derivatives. Finally, to facilitate catalyst recoverability and reusability, complex 1 was immobilized on GO@Fe3O4@APTES (GO, graphene oxide; APTES, 3-aminopropyltriethoxysilane) to generate GO@Fe3O4@APTES@FeL1 (GOTESFe). GOTESFe was thoroughly characterized through scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy and efficiently used for the synthesis of dihydroquinazoline derivatives. GOTESFe could be magnetically recovered and reused up to five cycles without compromising its catalytic efficiency. Therefore, immobilization of the chosen iron complex onto magnetic GO sheets offers an extremely competent route in providing a blueprint of a readily recoverable, reusable, robust, and potent catalyst for the synthesis of dihydroquinazoline-based compounds.

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Section: Resultsmentioning

confidence: 98%

Section: ■ Results and Discussionmentioning

confidence: 99%

Iron Complexes Anchored onto Magnetically Separable Graphene Oxide Sheets: An Excellent Catalyst for the Synthesis of Dihydroquinazoline-Based Compounds

Chakraborty

Chowdhury

Menéndez³

et al. 2020

ACS Appl. Mater. Interfaces

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“…It is clear from the results that there is almost 40 °C increase in thermal stability achieved by the incorporation of 4 wt % GOPOSS to sPS. The enhanced thermal stability in the presence of GOPOSS can be due to the inherent heat resistance of the POSS molecules along with the tortuous path effect of the layered material in the polymer matrix. , The homogeneous arrangement of the layered filler in the sPS matrix, as shown in the schematic representation in the inset of Figure a, will help to prevent the easy permeation of heat through the matrix. The thermal conductivity measured for sPS–GOPOSS is shown in Figure b.…”

Section: Resultsmentioning

confidence: 99%

Sustainable in Situ Approach to Covalently Functionalize Graphene Oxide with POSS Molecules Possessing Extremely Low Dielectric Behavior

et al. 2019

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Incorporation of multifunctional inorganic additives into the commercial polymers still stands as the most captivating and effective way to realize new-generation electronic components. Here, we introduce a simple, costeffective, and environmentally benign method to covalently functionalize graphene oxide (GO) with vinyl-and aminopropyl-functionalized hybrid silica spheres with a polyhedral oligomeric silsesquioxane (POSS)−siloxane composition. The reaction has been carried out in a mixture of ethanol and water (used as a medium) at ambient conditions with silane precursors. Later, the synthesized hybrid material has been tested for its dielectric properties after blending with syndiotactic polystyrene, a commercially available insulating semicrystalline polymer. It was observed that the dielectric constant decreases with the addition of GOPOSS up to 1.85 with a dielectric loss of 0.02 at 5 GHz. Significant improvements in the thermal properties of the composites were verified with minimal filler loading.

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“…Figure 1(c) illustrates the XRD spectrum of the GO. A typical single strong peak [25] appeared at approximately 11.35°. Because the XRD signal of the PTFE fibers is very intense and only a small amount of GO is anchored on the fiber surface, the surface changes of LbL-6-fabric is difficult to examine using this technique.…”

Section: Lbl Film Modified Hybrid Fabric (Lbl-fabric) Characterizationmentioning

confidence: 99%

Fabrication of PTFE/Nomex fabric/phenolic composites using a layer-by-layer self-assembly method for tribology field application

et al. 2019

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Fabric composites are widely applied as self-lubricating liner for radial spherical plain bearings owing to their excellent mechanical and tribological properties. Nevertheless, the poor interfacial strength between fibers and the resin matrix limits the performance of composites utilized as tribo-materials. To overcome this drawback, a mild layer-by-layer (LbL) self-assembly method was successfully used to construct hybrid fabric composites in the present work. In addition, this investigation addressed the effect of self-assembly cycles on the friction and wear behaviors of hybrid fabric composites under dry sliding condition. The results demonstrate that fabric composites with three or more self-assembly cycles have significantly enhanced surface activities and anti-wear performances. The results obtained in this work can provide guidance in the preparation of selflubricating liner composites and highlight how the LbL self-assembly techniques could influence the properties of hybrid fabric composites.

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Effect of functionalized graphene oxide with hyperbranched POSS polymer on mechanical and dielectric properties of cyanate ester composites

Abstract: Functionalized graphene oxide with a hyperbranched POSS polymer was designed and synthesized and then compounded with dicyclopentadiene bisphenol dicyanate ester to prepare nanocomposites.

Cited by 34 publications

References 57 publications

Iron Complexes Anchored onto Magnetically Separable Graphene Oxide Sheets: An Excellent Catalyst for the Synthesis of Dihydroquinazoline-Based Compounds

Iron Complexes Anchored onto Magnetically Separable Graphene Oxide Sheets: An Excellent Catalyst for the Synthesis of Dihydroquinazoline-Based Compounds

Sustainable in Situ Approach to Covalently Functionalize Graphene Oxide with POSS Molecules Possessing Extremely Low Dielectric Behavior

Fabrication of PTFE/Nomex fabric/phenolic composites using a layer-by-layer self-assembly method for tribology field application

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