PMMA Solution Research Articles

Unveiling the Potential of Brazilian Eucalyptus for Transparent Wood Manufacturing via the Kraft Pulping Process as a Future Building Material

The emergence of transparent wood as a viable alternative to traditional glass has sparked considerable interest in recent research endeavors. Despite advancements, challenges persist in the delignification methods and wood species utilized in prior studies. Therefore, this study delves into the potential of Brazilian eucalyptus wood for transparent wood production through the kraft pulping process. Delignification was carried out in a laboratory setting, replicating the kraft process with varying reaction times (15, 30, 45, and 60 min). The resulting delignified wood veneers were impregnated with a pre-polymerized PMMA solution. The study encompassed various analyses, including UV-Vis spectroscopy, colorimetry, SEM, optical microscopy, and mechanical property evaluations. The results revealed intriguing trends in terms of transparency, color changes, microstructural modifications, and mechanical properties as a function of delignification time. This work presents valuable insights into the transformative potential of eucalyptus wood, offering a deeper understanding of the interplay between wood modification and PMMA impregnation.

X-ray characterization, structural analysis, antibacterial activity, and self-cleaning property of Cu-doped TiO2-SiO2 nanocomposite prepared by sonochemical process

TiO2-SiO2 nanocomposites with different copper (Cu) precursor loadings were prepared by a one-step sonochemical process. The mole ratio of Cu precursor in TiO2-SiO2 composite was varied at 0.004, 0.008, 0.020, and 0.040, respectively. The specific X-ray characterization techniques on crystalline structure, chemical composition, and chemical states of Cu-doped TiO2-SiO2 composite were carried out by X-ray diffraction technique (XRD), X-ray fluorescence (XRF), and X-ray photoelectron spectroscopy (XPS), respectively. Surface morphology and chemical bonding of Cu-doped TiO2-SiO2 composite were monitored by field emission scanning electron microscope (FE-SEM) and Fourier transform infrared spectrophotometer (FTIR). For antibacterial properties, the inhibition zone of antimicrobial activity was investigated by varying amounts of Cu precursors in the TiO2-SiO2 composite. After that, Cu-doped TiO2-SiO2 composite powder with different Cu precursor ratios was mixed in PMMA solution and deposited on glass slides to study the optical property and hydrophilicity by UV-VIS-NIR spectrophotometer and contact angle method. XRD patterns of Cu-doped TiO2-SiO2 nanocomposites show the formation of the main TiO2 anatase phase with the ultrafine particles observed by FE-SEM images. FT-IR spectra of the composites are assigned to the prominent peaks of the Ti-O-Ti and Ti-O-Si bond relating to the TiO2-SiO2 host matrix. Meanwhile, TiO2-SiO2 composites with Cu precursor at 0.004 mol ratio can significantly enhance the antibacterial activity with a large inhibition zone. The contact angle value of Cu-doped TiO2-SiO2 nanocomposite film at 0.040 Cu precursor mole ratio in the TiO2-SiO2 matrix resulted in the optimized composite ratio for achieving a hydrophilic surface on the substrate.

Surface strategy design concerning entrapment of chalcogenide onto ETFE substrate and extension to the assembly of memristor

Consideration of semi-conductor quantum dots as the suitable band-gap materials has been an effective way to replace the traditional emissive species such as phosphors, lanthanide edifices or organic building blocks. However, very few reports have been performed for the employment of such chalcogenide dots in brain-excitation devices such as memristors. In this work, the colloidal synthesis for the preparation of AgInS2 quantum dots as well as its optical characteristic has been recorded. Further exploration has been focused on the improvement of resistance switching behavior and a layer of manganese dioxide has been covered onto ITO conductive glass by electrochemical deposition. Following step concerns the incorporation of AgInS2 and the toluene solution of PMMA and the PMMA@AgInS2@MnO2 hybrid layer with optimized uniformity and stability has been afforded. Moreover, such functional device has been used to simulate biological synaptic behavior, which will provide an innovative and efficient route for the development of artificial synaptic functions.

Micellar Solutions of PMMA-b-PNIPAM in Water/Methanol Mixtures: Effect of Temperature on the Micellar Size, Core–shell Structure, and Interaction

Micellar Solutions of PMMA-<i>b</i>-PNIPAM in Water/Methanol Mixtures: Effect of Temperature on the Micellar Size, Core–shell Structure, and Interaction

Preparation of novel adsorptive membrane using spent spices waste-derived biochar to treat synthetic wastewater

This research work focuses on the development of biochar-infused polymeric mixed matrix membranes, where the biochar is derived from spent spice wastes. While essential oils and fatty acids extracted from spices are used as main ingredients in food items, cosmetics, and pharmaceuticals, the leftover spent spice waste is discarded in landfills. Potentially, the biochar derived by utilizing this spice waste can be used to remove pollutants from industrial wastewater. Although there is literature that uses this biochar to adsorb pollutants, very few investigate adsorption by trapping biochar in a polymer matrix. Here, we test the waste-derived biochar-polymer mixed matrix membranes (MMM) to remove dyes from wastewater to develop a circular economy. Biochar is prepared by pyrolyzing the mixture of spent spices at 350 °C, and then activating it thermally and chemically to increase the surface area available for adsorption, as seen in the FESEM images. It is then mixed with PMMA solution and spin-coated on an inert substrate. The deposited mixed matric membrane is peeled off the substrate and exposed to synthetic wastewater in a vacuum filtration setup. We conclude that not only is the adsorption efficiency of the MMM method comparable within 10% of dye removal efficiency to the batch method, it is also significantly faster and has the potential to continuously treat large volumes of wastewater.

Fabrication of Mechanically Strong Silica Aerogels with the Thermally Induced Phase Separation (TIPS) Method of Poly(methyl methacrylate).

Constructing and maintaining a three-dimensional network structure with high porosity is critical to the preparation of silica aerogel materials because this structure provides excellent properties. However, due to the pearl-necklace-like structure and narrow interparticle necks, aerogels have poor mechanical strength and a brittle nature. Developing and designing lightweight silica aerogels with distinct mechanical properties is significant to extend their practical applications. In this work, thermally induced phase separation (TIPS) of poly(methyl methacrylate) (PMMA) from a mixture of ethanol and water was used to strengthen the skeletal network of aerogels. Strong and lightweight PMMA-modified silica aerogels were synthesized via the TIPS method and supercritically dried with carbon dioxide. The cloud point temperature of PMMA solutions, physical characteristics, morphological properties, microstructure, thermal conductivities, and mechanical properties were investigated. The resultant composited aerogels not only exhibit a homogenous mesoporous structure but also achieve a significant improvement in mechanical properties. The addition of PMMA increased the flexural strength and compressive strength by as much as 120% and 1400%, respectively, with the greatest amount of PMMA (Mw = 35,000 g/mole), while the density just increased by 28%. Overall, this research suggests that the TIPS method has great efficiency in reinforcing silica aerogels with less sacrifice of low density and large porosity.

Effect of molecular weight on polymer solution facilitated transfer of non-Brownian particles

Solution driven particle transfer on solid substrates has many industrial applications but can be difficult to control and characterize. In this study, poly(methyl methacrylate) (PMMA) is considered as the binder polymer, and the effect of the molecular weight (MW) on particle transfer through entrainment is investigated. The transfer phenomenon of polydisperse spherical rigid micro-particles from the PMMA solution has been analyzed and two hypotheses are tested here: (i) there exists a threshold polymer content below which only the smallest particles will be transferred from the bulk; (ii) at the same viscosity of different molecular weight PMMA solution, the solid transfer phenomenon will be similar. By changing the mass and viscosity using three PMMA samples with different MWs in the 1,3-dioxolane solvent, we observe low, intermediate, and high viscous regimes of the PMMA-dioxolane solution system. The low, intermediate, and high viscous regimes can be controlled with the MW and can entrain distinct particle size distributions onto surfaces. This behavior is thoroughly analyzed and relates to the film formation. These results confirmed our first hypothesis that we could use polymer content to control the particle size distribution and that a threshold polymer content exists. However, at similar viscosities, higher molecular weight polymers yielded lower average particle sizes and narrower distributions, which is counter to our second hypothesis. These findings can provide a better understanding of the binder behavior and its influence on the particle transfer process which opens-up the possibility of particle sorting process from a polydisperse suspension mixture and high-yield material transfer for porous structure coating and joining processes. Understanding the particle transfer process can also enable reverse engineering of the liquid carrier system in a complex mixture, which can be beneficial for industrial applications.

A Facile Synthesis of P(VDF-TrFE)-Coated-PMMA Janus Membranes for Guided Bone Regeneration

Bone repair and regeneration have aroused widespread interest due to their potential usefulness in cases when bone self-healing is insufficient. In this work, a Poly(vinylidene fluoride-trifluoroethylene)-coated-Poly methyl methacrylate Janus membrane was prepared, where a P(VDF-TrFE) coating on a PMMA film serves as Janus-A to mediate cell growth behavior, owing to its electroactivity, and the PMMA film serves as Janus-B to inhibit soft-tissue growth. A P(VDF-TrFE) coating separated from the substrate was put above the PMMA film before the PMMA film had dried completely, and a Janus membrane formed because of the flowability and adhesion of the nonvolatile PMMA solution. Their bonding could withstand the pressure of the body fluids in the shear direction. Various crystallization substrates were also applied to modulate the P(VDF-TrFE) coating’s surface potentials, as the surface potential would further affect cellular response. It was also found that the responses of the bone marrow mesenchymal stem cells (BMSCs) and bone marrow macrophages (BMDMs) could be adjusted through surface potential modification. Such a Janus membrane could potentially be applied to a biological environment with the effect of both guiding bone regeneration and preventing soft tissue adhesion.

Development of polymethylmethacrylate/reduced graphene oxide composite films as thermal interface materials

AbstractWith the miniaturization and integration of electronics into more powerful but smaller functional devices, major challenges arise. One of them is to efficiently dissipate the significant amount of thermal energy produced by these electronic devices. This requires interface materials with good thermal management properties. Reduced graphene oxide has attracted a lot of interest in this area due to its good thermal conductivity, similar with those of pristine graphene. In this work, polymethylmethacrylate/reduced graphene oxide (PMMA/RGO) composite thin films have been generated by drop casting mixtures of PMMA solutions and RGO suspensions, all prepared in N,N‐dimethylformamide (DMF) solvent. Raman, SEM and AFM investigations confirmed that homogenous PMMA/RGO composite thin films have been obtained, with RGO being uniformly distributed in the blending. Further measurements demonstrated that the thermal conductivity of RGO/PMMA composites increased with the concentration of RGO in the polymeric mixture: for the highest RGO content, the thermal conductivity increased by 210%, with no important modifications of electrical resistivity. These results are very promising for the development of new thermal interface materials based on PMMA/RGO composites to be used, for instance, in automotive industry.

Optimizing PMMA solutions to suppress contamination in the transfer of CVD graphene for batch production.

Mass production and commercial adoption of graphene-based devices are held back by a few crucial technical challenges related to quality control. In the case of graphene produced by chemical vapor deposition, the transfer process represents a delicate step that can compromise device performance and reliability, thus hindering industrial production. In this context, the impact of poly(methyl methacrylate) (PMMA), the most common support material for transferring graphene from the Cu substrate to any target surface, can be decisive in obtaining reproducible sample batches. Although effective in mechanically supporting graphene during the transfer, PMMA solutions needs to be efficiently designed, deposited, and post-treated to serve their purpose while minimizing potential contaminations. Here, we prepared and tested PMMA solutions with different average molecular weight (AMW) and weight concentration in anisole, to be deposited by spin coating. Optical microscopy and Raman spectroscopy showed that the amount of PMMA residues on transferred graphene is proportional to the AMW and concentration in the solvent. At the same time, the mechanical strength of the PMMA layer is proportional to the AMW. These tests served to design an optimized PMMA solution made of a mixture of 550,000 (550k) and 15,000 (15k) AMW PMMA in anisole at 3% concentration. In this design, PMMA-550k provided suitable mechanical strength against breakage during the transfer cycles, while PMMA-15k promoted depolymerization, which allowed for a complete removal of PMMA residues without the need for any post-treatment. An XPS analysis confirmed the cleanness of the optimized process. We validated the impact of the optimized PMMA solution on the mass fabrication of arrays of electrolyte-gated graphene field-effect transistors operating as biosensors. On average, the transistor channel resistance decreased from 1860 to 690 Ω when using the optimized PMMA. Even more importantly, the vast majority of these resistance values are distributed within a narrow range (only ca. 300 Ω wide), in evident contrast with the scattered values obtained in non-optimized devices (about 30% of which showed values above 1 MΩ). These results prove that the optimized PMMA solution unlock the production of reproducible electronic devices at the batch scale, which is the key to industrial production.

Fabrication of cylindrical microlens array using rotatable multi-arrayed needle coating module for light out-coupling of OLEDs

We have performed coatings of poly(methyl methacrylate) (PMMA) using a rotatable multi-arrayed needle coating module to achieve high-density and high-aspect-ratio cylindrical microlens arrays (C-MLAs) for potential applications in organic light-emitting diodes (OLEDs). It is shown that high-density C-MLAs can be fabricated by rotating the coating module in such a way that the spacing between microlenses can be reduced (tuned). To enhance the aspect ratio of C-MLAs, we have analyzed the coating behaviors by varying the material parameters such as the molecular weight of PMMA, solute concentration, and wettability of the PMMA solution. It is demonstrated that high-aspect-ratio C-MLAs can be achieved using a coating solution with a small amount of a hydrophobic solvent, in which a high concentration of low-molecular-weight PMMA is dissolved. To further enhance the aspect ratio, we have come up with a new process method; repetitive coating and pre-drying treatment in ambient air. Such a repetitive coating method is shown to boost the microlens thickness without a much compromise on the microlens width. With this scheme, we have fabricated the C-MLA with the average thickness of 22.6 μm and width of 125 μm (aspect ratio as high as 0.18) at a coating velocity of 3 mm/s. The light out-coupling efficiency of OLED with the C-MLA increases by 20%, which is in good agreement with the result by ray tracing simulations.

Organic phosphor doped thermoplastics with ultralong and memorable room temperature phosphorescence different from crystals

Organic room temperature phosphorescence (RTP) crystals have been extensively reported but encounter poor mechanical properties and processing and application flexibility, which inspires much interest in developing amorphous RTP polymers. However, the current RTP polymers are mainly solution-processed films, and their thermoplasticity and shape and size flexibility and retainability as well as RTP properties need to be improved. Herein, we dissolve two classes of carbazole derivatives starting from commercial (CCZ) and self-made (LCZ) carbazole into solution of PMMA and find the solution-processed films show very poor RTP properties, however, when they are thermoplastic processed into plastic sheets, ultralong blue-yellow dual RTP and blue RTP are observed after photo-activation, which are distinctly different from their crystal RTP. These results reveal that thermoplasticizing can not only alter dispersion states but also local environment of carbazole derivatives, enabling LCZ derivative without crystal RTP to also emit ultralong molecular RTP in polymer matrix. Since RTP generation of polymer films requires photoactivation and the photoactivated RTP patterns show ultralong memory effect, promising information storage and anti-counterfeiting is enabled. This work demonstrates that organic hetero-cyclic molecules can exhibit very interesting and unpredictable RTP properties in polymers different from crystals, opening up a vast research space and a simple processing strategy for tuning and/or enhancing RTP properties of organic doped polymers.

Optimizing the PMMA Electron-Blocking Layer of Quantum Dot Light-Emitting Diodes.

Quantum dots (QDs) are promising candidates for producing bright, color-pure, cost-efficient, and long-lasting QD-based light-emitting diodes (QDLEDs). However, one of the significant problems in achieving high efficiency of QDLEDs is the imbalance between the rates of charge-carrier injection into the emissive QD layer and their transport through the device components. Here we investigated the effect of the parameters of the deposition of a poly (methyl methacrylate) (PMMA) electron-blocking layer (EBL), such as PMMA solution concentration, on the characteristics of EBL-enhanced QDLEDs. A series of devices was fabricated with the PMMA layer formed from acetone solutions with concentrations ranging from 0.05 to 1.2 mg/mL. The addition of the PMMA layer allowed for an increase of the maximum luminance of QDLED by a factor of four compared to the control device without EBL, that is, to 18,671 cd/m2, with the current efficiency increased by an order of magnitude and the turn-on voltage decreased by ~1 V. At the same time, we have demonstrated that each particular QDLED characteristic has a maximum at a specific PMMA layer thickness; therefore, variation of the EBL deposition conditions could serve as an additional parameter space when other QDLED optimization approaches are being developed or implied in future solid-state lighting and display devices.

Mechanical Properties of Some Epoxy-PMMA Blends

The thermoset polymers and the thermoplastic polymers matrix composites require different forming techniques due to the different properties of two classes of polymers. While the forming technique for thermoset polymer matrix composites does not require the use of special equipment, the thermoplastic polymer matrix composites imposes the rigorous control of temperature and pressure values. Each type of polymer transfers to the composite a set of properties that may be required for a certain application. It is difficult to design a composite with commonly brittle thermoset polymer matrix showing properties of a viscoelastic thermoplastic polymer matrix composite. One solution may consist in mixing a thermoset and a thermoplastic polymer getting a polymer blend that can be used as matrix to form a composite. This study is about using PMMA solutions to obtain thermoset-thermoplastic blends and to mechanically characterize the obtained materials. Three well known organic solvents were used to obtain the PMMA solutions, based on a previous study concerning with the effect of solvents presence into the epoxy structure.

Poly(Methyl Methacrylate) Coatings Containing Flame Retardant Additives from Suspensions in Water-2-Propanol.

A dip-coating technique is designed for deposition of poly(methyl methacrylate) (PMMA) from water/2-propanol mixture, avoiding the use of traditional toxic solvents. Solutions of PMMA macromolecules with high molecular weight (MW) are obtained for a water/2-propanol ratio of 0.15–0.33 and the solubilization mechanism is discussed. The ability to use concentrated PMMA solutions and high MW of the polymer are the key factors for the successful dip coating deposition. The coating mass for 10 g L−1 polymer solutions shows a maximum at a water/2-propanol ratio of 0.25. The deposition yield increases with the polymer concentration increase and with an increasing number of the deposited layers. PMMA deposits protect stainless steel from aqueous corrosion. The coating technique allows for the fabrication of composite coatings, containing flame-retardant materials (FRMs), such as commercial halloysite, huntite, hydrotalcite, and synthesized Al(OH)3, in the PMMA matrix. The FRM content in the coatings is modified by variation of the FRM content in colloidal suspensions. A fundamentally new method is developed, which is based on the salting out aided dispersive extraction of Al(OH)3 from the aqueous synthesis medium to 2-propanol. It is based on the use of hexadecylphosphonic acid molecules as extractors. The method offers advantages of reduced agglomeration.

A creative approach to prepare structure-tunable multilayered PMMA/PS/PMMA foams

The objective was to explore a new approach to prepare multilayered poly(methyl methacrylate)/polystyrene/poly(methyl methacrylate) (PMMA/PS/PMMA) foams composed of two polymers with similar foaming window whereas different foaming characteristics. This approach involved a thermal compression of PMMA, PS and PMMA sheets, and a subsequent batch foaming process. To improve the interfacial adhesion, two layers of PS/PMMA blend were prepared via spin-coating of a common solution of PS and PMMA in chloroform onto both sides of the PS sheet. This treatment remarkably widened the foaming window, enabling preparation of multilayer PMMA/PS/PMMA foams with a controllable bimodal cell size distribution. By increasing the concentration of the adhesive, the gas desorption coefficient was adjusted, the expansion ratio was increased, and the cell sizes within two layers were successfully tuned. This study suggests an effective and convenient approach for preparing multilayered foams with bimodal cell size distribution.

Deposition of poly(methyl methacrylate) and composites containing bioceramics and bioglass by dip coating using isopropanol-water co-solvent

A new dip coating method has been developed for the fabrication of poly(methyl methacrylate) (PMMA) coatings on stainless steel. Despite the insolubility of PMMA in individual solvents, such as water and alcohol, concentrated solutions of high molecular mass PMMA were obtained in an isopropanol-water mixture. The new dip coating method offers processing advantages of the use of isopropanol-water co-solvent instead of toxic organic solvents. It was been demonstrated that adherent films can be obtained by this method from solutions of high molecular mass PMMA. Another important finding was the feasibility of deposition of composite coatings, containing bioceramics, such as TiO2, Al2O3, hydroxyapatite, and bioglass in the PMMA matrix. PMMA acted as a dispersant or co-dispersant for deposition or co-deposition of the inorganic particles. Potentiodynamic and impedance spectroscopy studies showed that PMMA coatings provided corrosion protection of stainless steel in 3 % NaCl solution. Composite PMMA-TiO2, PMMA-Al2O3, PMMA-hydroxyapatite, PMMA-bioglass and PMMA-hydroxyapatite-bioglass coatings provided enhanced corrosion protection, compared to pure PMMA coatings. The obtained composite coatings are promising for applications in biomedical implants.

Effects of inkjet printed toughener on delamination suppression in drilling of carbon fibre reinforced plastics (CFRPs)

Delamination has been recognised as the predominant damage induced during the drilling of carbon fibre reinforced plastics (CFRPs). It could significantly reduce the bearing capacity and shorten the service life of the designed component. To enhance the delamination resistance of CFRPs for different applications, great affords have been done to improve their interlaminar fracture toughness. However, due to the difficulty in accurately controlling the amount of the toughener applied in the interface, effect of the toughener content on the toughening efficiency is rarely studied. In this work, an experimental research was developed to investigate the performance of the toughener on the improvement of delamination resistance in the drilling of CFRPs and parametrically optimise the toughener content with the consideration of different feed rates. Specifically, poly(methyl methacrylate) (PMMA) solutions with various concentrations were selected to add on the CFRP prepreg, and co-cured together with layups. The inkjet printing technology was adopted to deposit the PMMA solutions for precisely controlled toughener contents. Through drilling experiments on the toughened CFRPs, it was found that the optimal content of the PMMA solution was 10 wt% to offer the least delamination, in particular, for the situation under the highest feed rate condition. The toughing mechanisms were also concluded by analysing the histories of the thrust force and torque in the drilling process. The results of this study is significantly contribute to the locally toughening of the composite interfaces and the improvement of the drilling quality, which is specifically helpful to strengthen the joint property for the structural design stage for the aircraft.

High energy density with ultrahigh discharging efficiency obtained in ceramic-polymer nanocomposites using a non-ferroelectric polar polymer as matrix

To overcome the low discharging efficiency of ceramic-polymer composites using ferroelectric polymers as matrix and to take the advantage in fabrication offered by the polar polymer, a polar but non-ferroelectric polymer – poly(methyl methacrylate) (PMMA) – was selected as the matrix in the development of high performance composites for energy storage. Ba0.5Sr0.5TiO3 (BST) nanoparticles were selected as the filler. Freestanding and flexible BST-PMMA ceramic-polymer nanocomposites with BST content up to 30 vol.% were fabricated in thickness of about 5 μm using spin-coating process and were systemically studied. Due to the strong interaction between the polar groups of PMMA and the hydroxyl groups on the surface of BST nanoparticles, the suspension of BST nanoparticles in PMMA solution exhibits excellent stability and, hence, the nanocomposite films have excellent microstructure uniformity and compatibility between the BST nanoparticles and PMMA matrix. All the BST-PMMA films exhibit excellent frequency (100 Hz to 1 MHz) and temperature (−90 to 100 °C) stabilities in their dielectric properties with a high energy-storage density of more than 11 J/cm3. Most importantly, an ultra-high discharging efficiency of almost 100% is obtained in all the nanocomposites.

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

ABSTRACTIn this study, a broadband, intense, novel, and promising microwave‐absorbing nanocomposite was prepared using graphite‐like carbon nitride (g‐C3N4)/CuS suspended in poly(methyl methacrylate) (PMMA) medium. The g‐C3N4nanosheets were synthesized by heating the urea as well as the CuS nanoparticles, and g‐C3N4/CuS nanocomposites were prepared using a solvothermal method and then were separately molded by a PMMA solution to investigate their microwave‐absorbing characteristics. The Fourier transform infrared and X‐ray powder diffraction were used to characterize the g‐C3N4, CuS, and CuS/g‐C3N4nanostructures, which confirmed that the pure structure of the nanomaterials has been synthesized. The optical properties of the nanostructures were also investigated by diffuse reflection spectroscopy analysis. Accordingly, the Kubelka–Munk theory suggested significant narrow band gap for g‐C3N4/CuS nanocomposite (0.27 eV), facilitating electron jumping and conductive loss. The morphology of the structures was examined using field emission scanning electron microscopy micrographs, illustrating that the uniform hexagonal structures of the CuS nanoplates have been formed and the CuS two‐dimensional structures were uniformly distributed on the g‐C3N4nanosheets. Finally, the microwave‐absorbing properties of the CuS, g‐C3N4, and g‐C3N4/CuS were investigated by PMMA as a host. The microwave‐absorbing properties were evaluated using a vector network analyzer. The results illustrated that the maximum reflection loss of the g‐C3N4/PMMA nanocomposite was −71.05 dB at 14.90 GHz with a thickness of 2.00 mm, demonstrating a 1.70 GHz bandwidth &gt;30 dB, as well as g‐C3N4/CuS/PMMA nanocomposite absorbed 7.30 GHz bandwidth of more than 10 dB with a thickness of 1.80 mm along the x‐ and ku‐band frequency. The obtained results introduced the PMMA as a capable microwave‐absorbing substrate. Besides, the g‐C3N4/CuS/PMMA nanocomposite demonstrated metamaterial property and abundant attenuation constant. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2020,137, 48430.