Grafted Graphene Oxide Research Articles

Cold crystallization behavior of poly(lactic acid) induced by poly(ethylene glycol)-grafted graphene oxide: Crystallization kinetics and polymorphism

Cold crystallization between the glass transition and melt temperature is of particular significance for crystalline regulation due to the slow crystallization rate of poly(lactic acid) (PLA). Incorporation of nucleation agents can promote PLA crystallization by reducing the nucleation activation energy and offering nucleation sites. Herein, we investigated the cold crystallization behavior of PLA induced by poly(ethylene glycol)-grafted graphene oxide (PEGgGO) which was synthesized and identified as a powerful nucleation agent for melt crystallization. The obtained results showed that PEGgGO not only accelerated the cold crystallization kinetics of PLA, but also promoted the polymorphic transition kinetics during the heating process. The half crystallization time of PLA induced by PEGgGO was shortened by 51 % and the final crystallinity increased by 57 % compared to that induced by GO alone at the same loading of 0.5 wt%. In addition, relative to GO, PEGgGO enabled the α′-to-α phase transition kinetics of PLA by a reduced transition temperature range of 26 % due to its excellent nucleation ability even at cold crystallization. The flexible PEG chains on GO facilitated crystalline regulation of PLA owing to the improved chain mobility. This work provides a broader framework for fashioning semicrystalline PLA products with enhanced crystallinity and refined crystal structure towards prospective applications.

Enhancing fiber-reinforced asphalt binders via graphene oxide grafting: A novel interfacial modulation strategy

This study reports a novel interfacial enhancement strategy for fiber-reinforced asphalt binders. The graphene oxide (GO) nanosheets were used and grafted onto polyester (PET) and polyacrylonitrile (PAN) fibers in order to enhance the performance of modified asphalt binders. Prior to this, ultraviolet ozone (UVO) treatment was primarily adopted for activating the inert surface of fibers. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and Scanning electron microscope (SEM) confirmed that GO-modified fibers were successfully prepared via surface modification. For the rheological properties determined by dynamic shear rheometer (DSR), the asphalt binders with GO-modified fibers exhibit improved high-temperature rutting resistance, better creep and recovery characteristics and increased anti-fatigue properties. Remarkably, it demonstrates that the recovery (R) value of GO-PAN modified asphalt binder is increased by 21.9 %, and the non-recoverable compliance (Jnr) value of GO-PET modified asphalt binder has been reduced by 31.9 % compared to that reinforced with the unmodified fiber in multiple stress creep recovery (MSCR) tests. These enhancements are mainly attributed to the increased roughness and modulus of the GO-grafted fibers, which promote effective stress transfer at the fiber-asphalt interfaces. Results from the atomic force microscope (AFM) indicate that the Young’s modulus of GO-PET and GO-PAN is 94.2 % and 260.0 % higher than that of PET and PAN, respectively. This research not only provides a simple and cost-effective method for improving the rheological performance, but also elucidates the enhancement mechanism of interfacial behavior in fiber-reinforced asphalt binders.

5‐aminobenzimidazole@graphene oxide nanosheets doped polyimide nanocomposites: Low‐temperature curing and improved mechanical properties

AbstractThe preparation of polyimide matrix composites with low curing temperature and high mechanical properties is of great importance. In this study, a low‐cost and multi‐functional nanofiller, 5‐aminobenzimidazole grafted graphene oxide (5‐ABZ@GO) has been designed. By nucleophilic attack on 5‐aminobenzimidazole basic groups and doping of GO, the above requirements of polyimide composites were skillfully realized. The results show that when the addition of 5‐ABZ@GO is 1%, the 5‐ABZ@GO/PI nanocomposites can achieve complete imidized at 200°C. Moreover, the nanocomposite prepared by imidization at 200°C has good mechanical and thermal properties (tensile strength is 141.64 MPa, modulus is 6.05 GPa, T5% is as high as 543.5°C), which is better than the PI composites prepared at 320°C. This study provides an innovative approach to preparing polyimide composites that meet mechanical performance requirements while utilizing comparatively lower curing temperatures, low curing temperature polyimide resins provide a new path for integrated composites with structure–function integration.

Enhanced electromechanical performance of Nafion actuator doped by poly(ethylene glycol)‐grafted graphene oxide

AbstractCurrent ionic polymer–metal composite (IPMC) actuators have severe actuation drawbacks (i.e. low force output and poor stability), hampering their applications. To address these issues, poly(ethylene glycol)‐grafted graphene oxide (PEG‐GO) is synthesized and incorporated into a Nafion matrix, thus producing a PEG‐GO hybrid Nafion film with better physiochemical properties for fabricating a high‐performance, low‐cost IPMC actuator. The modification of PEG to GO not only prevents GO agglomeration and sedimentation, but also avoids loss of PEG in water. Driven by a 0.2 Hz, 2.5 V electric field, the hybrid IPMC actuator exhibits superior electromechanical behaviors, i.e. a swing angle of 110.3°, a blocking force of 6.89 mN and a stable working time of 485 s, respectively increasing by 92%, 209% and 294% when compared to a pure Nafion actuator. © 2024 Society of Chemical Industry.

Outstanding interlaminar strength of carbon fiber reinforced epoxy resin via graphene oxide chemical bridge bonding

Carbon fiber reinforced polymers (CFRPs) are susceptible to interlaminar failure under high shear stress, which reduces their service life. Herein, we report a strategy to address the interlaminar damage problem of CFRPs by utilizing graphene oxide (GO) as a bridge to chemically bond carbon fibers and epoxy resin. Amino groups were grafted on the surface of carbon fibers to react with GO, then active amino functional groups were introduced onto GO, enabling crosslink with the epoxy resin. The chemical bonding force and mechanical interlocking effect of GO tightly integrated the carbon fibers with the epoxy resin, greatly reducing relative slip under high shear stress. This flexible and robust connection resulted in a significant improvement in the interfacial adhesion strength of CFRPs. The GO content and type of amino reactants were optimized to fabricate CFRPs, and the interlaminar shear strength and transverse fiber bundle tensile strength were increased to 76.36 MPa and 34.2 MPa, which were 46.2 % and 77.2 % higher than those of pre-modification materials, respectively. This research demonstrates that the chemical bonding provided by grafting graphene oxide significantly enhances interlaminar bond strength, thereby extending the service life of CFRPs and offering a promising path for manufacturing high-strength composites.

Branched polymer grafted graphene oxide (GO) as a 2D template for calcium phosphate growth

HypothesisGraphene Oxide (GO)-templated deposition of inorganic materials through synthesis on dispersed single sheets of GO is often complicated by the loss of the desired 2D morphology owing to the coagulation of GO sheets at high salt concentrations and non-templated homogenous nucleation. Modifying GO with anionic polymer is expected to solve both problems by i) enhancing electrostatic(steric) stabilization upon exposure to high concentrations of the ionic precursors, and ii) offering additional nucleation sites at the grafted anionic moieties to avoid homogeneous secondary nucleation. ExperimentsGO was grafted with branched copolymers of poly(ethylene glycol) methacrylate (PEGMA 500) and diethylene glycol dimethacrylate (DEGDMA) and ω-vinyl terminated methacrylic acid macromonomer (P(MAA)), the latter serving as an addition-fragmentation chain transfer agent. The colloidal stability of GO dispersions in water toward salt was evaluated before and after modification. Precipitation of calcium phosphate (CaP) was performed by incubating modified GO in the precursor solutions. The conditions were optimized to maximize the nucleation selectively onto GO without homogeneous CaP nucleation and coagulation of the GO-sheets. FindingsThe copolymer grafted GO-sheets shows superior colloidal stability when dispersed in water. No aggregation occurs in the incubating ionic CaP precursor solutions. The optimum templated deposition of CaP onto the GO sheets by precipitation is to add a second shot of precursors after the nucleation stage to obtain GO sheets fully decorated with calcium phosphate nanorods without self-nucleation. Via the careful design on the GO modification and incubation process, the growth of calcium phosphate nanorods were confined in the desired 2D order exclusively, hereby achieving the goal of an efficient GO-templated synthesis.

Amine grafted graphene oxide embedded in polyamide membranes for simultaneous removal of oil, metals, and salts from oily water

As a result of the economic growth and the emergence of industrialization in most economies, water purification has gained increased significance. The nanocomposite nanofiltration membranes can remove salts, hydrocarbons, and environmental pollutants. However, the surface wettability of the membrane materials is crucial since they are utilized to separate emulsified oil/water mixtures. In this study, the polyvinylidene fluoride support membrane was successfully modified to a hydrophilic state in this instance via dip single-step coating by modifying graphene oxide (GO) with (3-aminophenyltriethoxysilane)-trimesic acid-melamine (GO-APTES-TA-MM) polyamide. The separation efficiency and antifouling properties were evaluated by analyzing the flux using a membrane cell tester machine. Scanning electron microscopy (SEM) was used to confirm the morphology of the membrane and EDX was employed to characterize the modified membrane before and after separation testing. The membrane shows good rejection of organic pollutants including pentane, isooctane, toluene, and hexadecane, attaining a removal of >90 % of heavy metals such as strontium, lead, and cobalt, and 86 % rejection of salt ions SO42−, and 42 % for Mg2+. According to the findings, the membrane can be a good choice for simultaneous treatment of wastewater containing a mixture of metal ions, hydrocarbons, and salt mixes from oily water.

Effect of reduced graphene oxide on vulcanization of polydimethylsiloxane composites

AbstractThis research aims to investigate the effect of reduced graphene oxide (rGO) on the kinetics of addition vulcanization in polydimethylsiloxane (PDMS) elastomers. For this purpose, the synthesis of graphene oxide (GO) and silane‐grafted GO followed by chemical reduction of particles was conducted to prepare rGOs with different surface chemistry. Particles were characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, x‐ray diffraction, scanning electron microscopy, and energy‐dispersive x‐ray analysis. Composites of PDMS containing these particles were prepared by solution mixing, and vulcanization of composites was investigated using differential scanning calorimetry. Results showed that the rate and degree of vulcanization reaction increase up to a critical concentration of particles and then decrease afterward. This behavior was attributed to the catalytic effect of chemical groups on the surface of rGOs, whereas the reverse behavior above the critical concentration was correlated to the immobilization of trapped rubber in the network of particles. Grafting graphene oxide by a long alkyl‐chain silane covered these chemical groups, suppressed the catalytic effect, improved the dispersion of particles, and shifted the critical concentration lower. The critical concentration was correlated to the electrical percolation threshold of particles and confirmed by the solvent swelling method. It was also shown that rGO can itself act as the catalyst for the vulcanization of PDMS with no need for platinum. As the dynamic‐mechanical‐thermal analysis showed, the PDMS composites containing 0.75 wt% of particles did not vulcanize properly. However, composites containing fewer particles were vulcanized.Highlights Reduced graphene oxide affects additional vulcanization of PDMS. Below a critical loading, rGO accelerates vulcanization by a catalytic effect. Above critical loading, rGO decelerates vulcanization by a networking effect. Surface groups of rGO control catalytic and networking mechanisms. Silane modification of rGO affects interfacial behavior, thus critical loading.

Synthesis and study of free radical graft polymerization of glycidyl methacrylate on gamma-irradiated graphene oxide

This study reports on the synthesis of a novel poly (glycidyl methacrylate) (PGMA) grafted graphene oxide (GO) by using a free radical-induced emulsion graft polymerization method. PGMA was grafted onto a gamma irradiated and vinyl functionalized GO substrate, and the parameters of graft polymerization (i.e., the concentration of monomer, initiator, and surfactant) were optimized to achieve the maximum grafting percentage. Remarkably, a PGMA grafting percentage of up to 2626 % was obtained under the optimal reaction conditions. The developed materials were characterized by different characterization techniques including Fourier-transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) analysis, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The presence of characteristic peaks of PGMA in FTIR spectra and changes in morphology of GO sheets after the grafting process confirmed the successful PGMA grafting onto GO. The thermal stability of the grafted samples was also significantly enhanced and increased with an increase in grafting percentage. This work discloses the tailoring of the properties of nanohybrid material obtained by free radical-induced emulsion graft polymerization. The prepared PGMA grafted GO nanohybrids can be further modified to develop adsorbents for metal uptake.

Tribological properties of self-lubricating fabric linings prepared with GO-modified basalt fiber

The wear resistance and friction reduction of the fabric liner are important for the service life of self-lubricating spherical plain bearings. Basalt fiber was subjected to chemical modification by grafting graphene oxide onto its surface, resulting in the preparation of GO@BF. Polytetrafluoroethylene/basalt fiber and polytetrafluoroethylene/GO@BF fabric liners were prepared, and the tribological properties were investigated. The friction regions of fabric liners were characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy, and the friction and wear mechanisms were analyzed. The results show that the addition of graphene oxide can effectively improve the friction reduction and abrasion resistance of the fabric liner. During the friction process, graphene oxide and polytetrafluoroethylene transfer film form a synergistic lubrication mechanism, which effectively reduces the formation of abrasive particles on the friction surface, and improves the tribological performance of the fabric liner.

Fabrication of SnO2/NGO hybrid nanocomposite as an effective photocatalyst for binary dye degradation under sunlight illumination

We successfully synthesized nitrogen-doped graphene oxide grafting tin oxide nanoparticles (SnO2/NGO nanocomposite). To evaluate the surface, optical and morphology characterization of synthesized SnO2/NGO nanocomposites was done using various analytical techniques. The XRD data indicate the crystallinity of a high-purity SnO2/NGO nanocomposite in nature. The Raman spectra of the resultant SnO2/NGO nanocomposite exhibit moderate graphitization with a ID/IG intensity of 0.98. Under sunlight irradiation, the photocatalytic activity of a produced SnO2/NGO nanocomposite on the breakdown of toxic binary organic dyes (methylene blue/methyl orange) was examined. On MB and MO, the resultant SnO2/NGO nanocomposite had a maximum degradation efficiency of 150 mins and 89.4%, 93.7%, respectively. Furthermore, the simple and inexpensive hydrothermal-derived SnO2/NGO nanocomposite exhibits rapid photocatalytic degradation on MB and MO when exposed to sunlight illumination.

Synthesis and characterization of grafted graphene oxide materials with lyotropic liquid crystalline properties detected by NMR spectroscopy

Grafted derivatives of graphene oxide (GO), namely N-vinyl-2-pyrrolidone grafted-GO (GO-g-NVP) and oleic acid grafted-GO (GO-g-OLA) were prepared by heating GO in the presence of the corresponding vinyl monomers and the AIBN radical initiator. The lyotropic mesogenic behavior of GO-g-NVP and GO-g-OLA in DMSO‑d6 was proved by deuterium NMR spectroscopy, showing these materials could be used as alignment media for obtaining NMR anisotropic parameters in organic solvent.

Layered assembly of PEGylated graphene oxide and Mg–Al layered double hydroxide nanosheets with superior adsorption capacity and selective isolation of hemoglobin

This study developed a novel organic-inorganic hybrid composite, shortly as GO-PEG-LDHs, by self-assembly of exfoliated Mg–Al layer double hydroxide (LDHs) on the polyethylene glycol (PEG) grafted graphene oxide (GO) to achieve the selective adsorption of hemoglobin (Hb). The prepared GO-PEG-LDHs has a hierarchical structure with a homogeneous loading of exfoliated LDHs nano-sheets on its surface. The adsorption test reveals that GO-PEG-LDHs exhibits an adsorption efficiency of 95.03% for Hb and 3.45% for bovine serum albumin (BSA). The adsorption of Hb follows the Langmuir model, with an ultrahigh adsorption capacity of 55248.6 mg/g, which is higher than any previously reported materials. Meanwhile, the adsorbed Hb can be efficiently recovered through elution with a 50 mM Tris-HCl buffer, with an elution efficiency of 80.77%. Circular dichroism (CD) spectra indicate no conformational change for Hb during the process of adsorption/desorption. Furthermore, the composite demonstrates the ability to selectively isolate Hb in the presence of interfering protein BSA, indicating its potential for practical applications.

Experimental investigation of sodium ion adsorption on polyacrylic acid grafted graphene oxide polymeric adsorbent: Kinetics, isotherms, and performance analyses

In this study, the sodium ion adsorption, as a desalination process of saline water, on polyacrylic acid grafted on graphene oxide (PAA-g-GO) was investigated. According to the results of GPC and FTIR analyses, it was confirmed that the synthesized adsorbent has a very effective function for Na+ adsorption. The remarkable finding about the synthesized adsorbent was that in all the tested pH range (8–10) and sodium ion concentrations (0.1–1 M), the measured adsorption capacities were reported to be more than 1750 mg/g. However, it is interesting that the maximum adsorption capacity was obtained a significant amount of 7462.31 mg/g at pH =10. According to the adsorption kinetics analysis results, the equilibrium time was obtained about 90 min. Also, by examining the effect of pH on the amount of sodium ion adsorption, it was found that it increased by increasing pH value. Adsorption data were also modeled with the Redlich-Peterson isotherm with R2 greater than 0.99 for all range of examined pHs. By examining the effect of adsorbent dosage on Na+ adsorption, it was found that the effect of the adsorbent dosage was very high at low initial concentrations (0.1 to 0.2 M), but this effect decreased by increasing the dosage.

Mimosa inspired intelligent anti-corrosive composite coating by incorporating lignin and pyridine derivatives grafted graphene oxide

Although the coating can effectively prevent metal corrosion, it is easy to form micro-pores and micro-cracks during the curing process, and the coating is inevitably damaged by the external environment during use, resulting in a reduction in its protective ability, thereby shortening the service life of the substrate. Inspired by the stress closure function of mimosa, an intelligent anti-corrosion coating with stress closure function against corrosion products (Fe2+) was prepared by using pyridine derivatives and lignin grafted graphene oxide (ATGO). By density functional theory calculation, the binding energy of pyridine group and Fe2+ was −369.99 kcal/mol, and their strong complexation would facilitate the formation of a dense protective layer at the metal corrosion interface. The test results showed that ATGO-CM coating had high fracture strength (86.9 MPa) and adhesion strength (2.03 MPa), as well as low water vapor permeability (1.3 × 10-6 g m−1 day−1 Pa−1). Electrochemical testing denoted that after soaking in 3.5 wt% saline solution for 100 days, the impedance modulus of the ATGO-CM coating remained at 5.36 × 109 Ω·cm2 at low frequencies (f = 0.01 Hz), which was two orders of magnitude higher than the blank group. Through scratch experiments showed that the complexation effect of pyridine groups and corrosive products could significantly improve the corrosion resistance of the coating, with Rct value of 1.8 × 104 Ω cm2 for the damaged coating, one order of magnitude higher than the blank group. This work not only provided a reference for the preparation of intelligent anti-corrosion coatings with bionic functions, but also increased the added value of biomass materials.

Facile and efficient grafting of graphene oxide onto carbon fiber with hyperbranched poly(thioether-yne) via click chemistry to improve interface and mechanical properties of composite

For the purpose of simultaneously improving the interface and mechanical properties of carbon fiber (CF)/epoxy (EP) composite, we presented a more facile and efficient approach to graft graphene oxide (GO) onto CF using hyperbranched poly(thioether-yne) (HPTY) as a bridging agent through the thiol-alkyne click chemistry reaction. The characterization results of FTIR, XPS, Raman, TGA, SEM, and AFM verified successful synthesis of CF-HPTY-GO hybrid reinforcement. The simultaneous introduction of GO and HPTY changed the fiber surface topography, meanwhile enhancing wettability and surface energy of CF. Based on that, the composite with superior interface 0Notably, the value of interface shear strength (IFSS) for CF-HPTY-GO/EP composite was enhanced by 94.4 % compared with pristine CF/EP composite. Moreover, the tensile and bending strength for CF-HPTY-GO/EP composite were increased by 38.2 % and 49.1 % compared with pristine CF/EP composite because of the effective stress transfer through interface. Therefore, this work is expected to offer a promising technique for preparing advanced structural composites with outstanding interface and mechanical properties.

Novel chitosan-zeolite X composite beads prepared by phase-inversion method for CO2 adsorptive capture

The urgent need to mitigate carbon emissions from industrial heat production has led to the exploration of novel carbon-based materials for carbon capture. Chitosan, a versatile framework, has been widely utilized for embedding many materials such as grafted graphene oxide, zeolite, and activated carbon to enhance the carbon capture capacity of diverse carbon-based materials. Remarkably, the combination of chitosan and zeolite overcomes the inherent drawbacks of powdery zeolite, resulting in improved stability and efficiency in carbon capture applications. In this study, zeolite X-chitosan composite was successfully synthesized using phase inversion method followed by solvent exchange and air drying. The synthesis procedure described in this study presents a notable advantage in terms of simplicity and ease of fabrication. The combination of SEM and XRD analyses provided evidence that the composite exhibited a uniform arrangement of zeolite within the chitosan framework and maintained the original properties of the powdered zeolite. The adsorption capacity of the composite was first investigated by varying mass ratio of zeolite per chitosan. The composite with mass ratio that gave the best adsorption capacity were then tested under various temperatures (−20 °C, 0 °C, 30 °C, and 50 °C) and pressures (1 kPa, 3 kPa, 5 kPa, and 30 kPa). The application of different adsorption models was also employed to simulate the breakthrough curves. Furthermore, the material also underwent multiple continuous adsorption-desorption cycles showing its potential for repeated rechargeability. In contrast, the synthesis and characterization of copper ion-exchanged composite yielded significant drop in adsorption capacity, likely due to the formation of ligands or the inherent reactivity of Cu2+ ions towards hydroxide.

Dual-functional Polyvinylidene Fluoride Beta Cyclodextrin-Grafted Graphene Oxide Mixed Matrix Membranes for Removal of Anionic Azo Dyes

Mixed matrix PVDF polymeric membranes were incorporated with β–CD grafted graphene oxide (GO) nanocomposites (β–CD-g-GO) via nonsolvent induced phase separation method and used in the adsorption of congo red (CR) and methyl orange (MO) dyes. The incorporation of β–CD-g-GO (6 wt%) was found to improve the membrane physico-chemical properties and performance. The water content was increased by 24.26%, contact angle reduced from 84.17 to 62.97° while flux increased from 12.42 to 275.03 L m−2 h−1 bar−1. The membranes were able to remove 100% of CR at pH 7 and 99.4% of the MO dye at pH 5 within 240 min. The adsorption kinetics and isotherms were well fitted to the pseudo second-order kinetic model and Freundlich isotherm model respectively. These results indicated that the adsorption of both dyes occurred via chemisorption and in a multilayer on a heterogeneous surface of the membranes. According to these findings, it was concluded that the adsorption mechanism was due to hydrogen bonding interactions between nitrogen and hydroxyl groups, inclusion complexation introduced by β–CD molecules and electrostatic interactions, between the negatively charged oxygen-containing groups of the membrane and the positively charged nitrogen and azo-linkages of the dye molecules. PVDF/β–CD-g-GO membranes have shown excellent adsorption efficiency towards azo dyes. This work indicates that the embedding of adsorptive GO-β–CD nanocomposites in PVDF membranes can remove anionic dyes from wastewater treatment.

Enhancement of anticorrosion resistance of a fluorinated polyimide matrix by incorporating self-fixing POSS-GO

In this study, we aimed to enhance the anticorrosion performance of composite coatings by introducing polyhedral oligomeric silsesquioxane (POSS)-grafted graphene oxide surfaces. These surfaces were modified to achieve super-hydrophobicity and a self-fixing effect. The modified material was employed to enhance the corrosion resistance of fluorinated polyimide (FPI) composite coatings composed of graphene oxide (GO) grafted by POSS (POSS-GO). The resulting composite coating exhibited substantially improved corrosion resistance compared to a pure FPI coating. The impedance modulus (|Z|0.01 Hz) of the 0.3 wt% FPI/POSS-GO coating was approximately 2.57 × 1011 Ω·cm2, which was greater than that of the pure FPI coating by approximately five orders of magnitude. The enhanced performance can be attributed to the synergistic interaction between the intrinsically hydrophobic polyimide matrix polymer, which acts as a barrier, and the POSS-GO fillers with their superhydrophobic and self-fixing characteristics. Notably, these properties remained effective even after subjecting the coatings to a 3.5 wt% NaCl solution during a 45-day salt spray test. These findings have significant implications for the development of cost-effective anticorrosion coatings for metal substrates.

Grafted graphene oxide nanoparticles as a yield point enhancer in water-based drilling fluids

Drilling fluids are used in exploration and production (E&P) for oil/gas. More recently, nanomaterial additives such as nano clay, nano-silica, nanocellulose, etc., have been of interest in improving drilling fluids' performance. Graphene and oxide (GO) nanomaterials have been attractive for oil-field applications. Furthermore, water-based drilling fluids are more environmentally desirable than oil-based fluids. This study demonstrated the successful synthesis and use of bi-facial grafted graphene oxide with two random copolymers and one block copolymer for water-based drilling mud application. The successful polymerization was verified by FTIR spectroscopy, EGA, DLS, and Raman spectroscopy. The dispersity and stability of GO-AMPS-r-DMA were tested in different water-based and oil-based solvents, indicating better dispersity and stability in water and DMF than GO. The thermal behavior of the three GO-polymer composites was studied by TGA, DSC, and EGA, showing higher stability with block copolymers than random ones. The performance of such grafted graphene materials was tested in water-based drilling fluids at simulated downhole temperatures and pressures. Results demonstrate the positive effect of these produced grafted graphene materials on mud rheological behavior at temperatures up to 350F and 10,100psi.