Polymer/graphene oxide (GO) thermoset composites with GO as a crosslinker

Ha, Heonjoo; Ellison, Christopher J.

doi:10.1007/s11814-017-0250-7

Cited by 20 publications

(11 citation statements)

References 79 publications

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“…As shown in Figures 2a and 2b, the Cd 3d and S 2p peak intensities of the Gr-CdS nanocomposite are lower than those of the pure CdS NPs; this result indicates a decrease in the atomic composition of Cd and S after the formation of Gr-CdS nanocomposite, which is consistent with the results of EDS analysis in Table 2. As shown in Figure 3c, the Gr-CdS nanocomposite exhibited a strong C 1s peak at a binding energy of 284.46 eV, which corresponds to sp 2 hybridized carbon in graphene, whereas the CdS NPs exhibited a relatively weak C 1s peak at 285.15 eV, which corresponds to C-O [41,42].…”

Section: Xps Analysismentioning

confidence: 99%

Performance of Graphene–CdS Hybrid Nanocomposite Thin Film for Applications in Cu(In,Ga)Se2 Solar Cell and H2 Production

et al. 2020

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A graphene–cadmium sulfide (Gr–CdS) nanocomposite was prepared by a chemical solution method, and its material properties were characterized by several analysis techniques. The synthesized pure CdS nanoparticles (NPs) and Gr–CdS nanocomposites were confirmed to have a stoichiometric atomic ratio (Cd/S = 1:1). The Cd 3d and S 2p peaks of the Gr–CdS nanocomposite appeared at lower binding energies compared to those of the pure CdS NPs according to X-ray photoelectron spectroscopy analyses. The formation of the Gr–CdS nanocomposite was also evidenced by the structural analysis using Raman spectroscopy and X-ray diffraction. Transmission electron microscopy confirmed that CdS NPs were uniformly distributed on the graphene sheets. The absorption spectra of both the Gr–CdS nanocomposite and pure CdS NPs thin films showed an absorption edge at 550 nm related to the energy band gap of CdS (~2.42 eV). The Cu(In,Ga)Se2 thin film photovoltaic device with Gr–CdS nanocomposite buffer layer showed a higher electrical conversion efficiency than that with pure CdS NPs thin film buffer layer. In addition, the water splitting efficiency of the Gr–CdS nanocomposite was almost three times higher than that of pure CdS NPs.

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Section: Xps Analysismentioning

confidence: 99%

Performance of Graphene–CdS Hybrid Nanocomposite Thin Film for Applications in Cu(In,Ga)Se2 Solar Cell and H2 Production

et al. 2020

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“…[ 31 ] It has been well documented that the pyrene functionality in the PPCP can promise a strong π – π stacking with GO sheets. [ 5,25,42,43 ] In addition, the pyrrole functionality of PPCP can further react with itself or with the pyrrole molecule to form a highly conjugated PPy by oxidation either chemically or electrochemically (Scheme 1), [ 27,44,45 ] and affording conductive property as well as strong π – π stacking with GO sheets. [ 27 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 1–3 ] Nowadays, graphene and its derivatives, graphene oxide (GO) and reduced graphene oxide (rGO), have been explored for a myriad of applications, ranging from fuel cells, sensors, to bioelectronics. [ 4–7 ] To harness graphene and its derivatives for these diverse applications, graphene‐based composites, such as polymer/graphene composites, that combine the properties of both materials have been widely studied. [ 8–10 ] The incorporation of graphene and its derivatives into polymer matrices can significantly improve the overall material properties, such as mechanical strength, electrical and thermal conductivities, corrosive resistance, and flame retardance.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional RAFT Agent Directed Preparation of Polymer/Graphene Oxide Composites

Hsia

Wan

Fan

et al. 2021

Macromol. Rapid Commun.

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Polymer/graphene oxide (GO) composites, which combine the physical properties of GO and the processability of polymers, are of increasing interest in a variety of applications ranging from conductive foams, sensors, to bioelectronics. However, the preparation of these composites through physical blending demands the polymers with functional groups that interact strongly with the GO. Here the design and synthesis of a new bifunctional reversible addition–fragmentation chain transfer (RAFT) agent are demonstrated, which allows the synthesis of polymers with predetermined molecular weights and low dispersibilities (Ð), while having functionalities at both polymer termini that allow strong binding to GO. To access polymers with diverse thermal and mechanical properties, acrylonitrile–styrene–acrylate (ASA) copolymers with different types of acrylates, both short and long side chains, are synthesized under the control of the bifunctional RAFT agent. Furthermore, the strong binding between GO and the synthesized polymers is verified and explored to prepare polymer/GO composites with diverse tensile strengths and conductivity in the range of semiconductors. Overall, this novel RAFT agent is expected to expand the utility of polymer/GO composites by providing well‐defined polymers with tunable properties and strong binding with GO.

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“…PCL is one of the slowest aliphatic polyesters to degrade with a degradation time that is usually over one year, due to the presence of five hydrophobic groups, -CH 2 , in its repetitive units [ 5 ]. On the other hand, its mechanical properties are not sufficient for applications in bone regeneration processes, which is why it is usually combined with different reinforcements, such as nHA [ 6 ], MWCNT [ 7 , 8 ], GO [ 9 ] and rGO [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Crystallization Behavior and Morphology of Biodegradable Poly(ε-caprolactone)/Reduced Graphene Oxide Scaffolds

2022

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Morphology, thermal properties and the non-isothermal melt crystallization kinetics of biodegradable poly(ε-caprolactone) (PCL)/reduced graphene oxide (rGO) scaffolds are studied with differential scanning calorimetry (DSC) at various cooling rates (5, 10, 15 and 20 °C/min). Thermally induced phase separation was used to manufacture the scaffolds (TIPS). The micrographs show a more homogeneous and defined morphology with larger pores and thicker pore walls. The melting temperature (Tm), melting enthalpy (ΔHm), crystallization enthalpy (ΔHc) and degree of crystallinity (Xc) increased with the addition of rGO, suggesting larger and more perfect crystalline structures. The degree of crystallinity increased with the presence of rGO. The crystallization peak shifted to higher temperatures as the rGO concentration increased independently of the cooling rates. The peak shifted to lower temperatures as the cooling rate increased with the same rGO composition. The values of t1/2 (time needed to reach 50% crystallization) were lower for scaffolds with rGO. The values of the crystallization rate coefficient were higher when the porous support contained rGO, which indicates that their crystallization systems are faster. The activation energy obtained with the Kissinger method decreased with the presence of rGO. The results indicate that reduced graphene oxide acts as a nucleating agent in the non-isothermal melt crystallization process. The addition of small quantities of rGO changes their thermal properties with which they can be modified for application in the field of tissue engineering.

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Polymer/graphene oxide (GO) thermoset composites with GO as a crosslinker

Cited by 20 publications

References 79 publications

Performance of Graphene–CdS Hybrid Nanocomposite Thin Film for Applications in Cu(In,Ga)Se2 Solar Cell and H2 Production

Performance of Graphene–CdS Hybrid Nanocomposite Thin Film for Applications in Cu(In,Ga)Se2 Solar Cell and H2 Production

Bifunctional RAFT Agent Directed Preparation of Polymer/Graphene Oxide Composites

Crystallization Behavior and Morphology of Biodegradable Poly(ε-caprolactone)/Reduced Graphene Oxide Scaffolds

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