Hybrid Foams Research Articles

Strengthening Interfacial Adhesion and Foamability of Immiscible Polymer Blends via Rationally Designed Reactive Macromolecular Compatibilizers.

Foams made of immiscible polymer blends have attracted great interest in both academia and industry, because of the integration of desirable properties of different polymers in a hybrid foam. However, the foamability and end-use properties are hampered because of the poor interfacial strength within the immiscible blends. Furthermore, few investigations have been carried out on the mechanisms by which interfacial strength and structure affect the foamability of polymer blends. In this work, two different reactive interfacial compatibilizers, i.e., poly(styrene-co-glycidyl methacrylate)-graft-poly(l-lactide) and poly(styrene-co-glycidyl methacry-late)-graft-poly(d-lactide), abbreviated as SG-g-PLLA and SG-g-PDLA, respectively, were designed and synthesized through reactive melt blending and subsequently applied to strengthen the interfacial strength and foamability of immiscible poly(butylene adipate-co-terephthalate) (PBAT)/poly(l-lactide) (PLLA) blends. Both compatibilizers could remarkably enhance the interfacial strength and foamability of the PBAT/PLLA blends, as evidenced by the significantly elongated dispersed phase in the resulting cocontinuous phase and more than 7000-fold increase in the cell density. Furthermore, the improved foamability was quantitively explained by the reduced gas diffusion and increased melt strength. Strikingly, the SG-g-PDLA introduced a stereocomplex crystal at the interface (i-SC), providing highly strengthened interfaces and nanoscale heterogeneous nucleation sites, which led to an energetically favorable cell nucleation. Moreover, foams with specifically laminated cell structures were fabricated by combining pressure-induced flow processing and i-SC strengthened interfaces. This work provides insight into the relationship between interfacial strength and formability of immiscible polymer blends and offers new possibilities for controlling cell morphologies and designing unique cell structures for polymer foams.

Synergistic Effects on the Mercury Sorption Behaviors Using Hybrid Cellulose Fiber/Chitosan Foam

AbstractThe aim of this study is to explore the use of a possible combination of both cellulose fiber and chitosan as natural renewable polymer to introduce a circular economy concept. In this work, cellulose fibers were incorporated into chitosan to prepare hybrid foam (1/5 w/w). The conditioned composite material was obtained by co‐dissolution in acetic acid using the freeze‐drying method. Column experiments were performed on the prepared foam to study the kinetic of mercury sorption to evaluate their feasibility and real applications in different industrial sectors. Experimental data show that the maximum adsorption capacity of mercury by hybrid cellulose fiber/chitosan foam is 400 mg g−1, pH 4.0 at 20 °C. Scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy EDX and specific surface area with BET analysis were used to provide a qualitative estimation of the fabricated composite foam. To elucidate the chemical modification of the material, FT‐IR analysis was performed. The resulting composite foam still demonstrates excellent adsorption performance after regeneration.

Anti-oxidation polyimide-based hybrid foams assembled with bilayer coatings for efficient electromagnetic interference shielding

High-performance electromagnetic interference (EMI) shielding materials are highly desirable in high-tech fields, particularly in high temperature conditions, whereas long term effectiveness of the EMI shielding performance still remains a challenge. Herein, polyimide-based PI@MXene@ANFs/PI hybrid foams assembled with MXene and polyimide bilayer coatings were fabricated via a facile strategy of freeze-drying plus thermal imidization followed by two-step dip-coating. More specifically, MXene coating acted as conducting layer to ensure the electrical conductivity of hybrid foams and polyimide coating served as protecting layer to enhance the long-term effectiveness of the hybrid foams by protecting MXene coating from oxidation during use. Benefiting from the conductive MXene coating and porous structure of the as-prepared hybrid foams, massive EMWs were converted into heat energy via ohmic losses, resulting in excellent EMI shielding performance of MXene@ANFs/PI and PI@MXene@ANFs/PI hybrid foams with an absorption-dominant EMI shielding mechanism in terms of EMI SE. After heat-treated at 250 °C for 100 h, the average EMI SET of PI@MXene@ANFs/PI-35 foam was slightly decreased by 4.97% from 46.3 to 44.0 dB, yet 65.85% from 48.9 to 16.7 dB for MXene@ANFs/PI-35 foam. The results indicated that the special bilayer coatings endowed the polyimide-based foams with lightweight, outstanding EMI shielding and anti-oxidation performance, presenting great prospects for the long-term application in extreme conditions.

Fused Cells between Human-Adipose-Derived Mesenchymal Stem Cells and Monocytes Keep Stemness Properties and Acquire High Mobility.

: BackgroundHuman-adipose-derived mesenchymal stem cells (hADMSCs) are multipotent stem cells which have become of great interest in stem-cell therapy due to their less invasive isolation. However, they have limited migration and short lifespans. Therefore, understanding the mechanisms by which these cells could migrate is of critical importance for regenerative medicine. Methods: Looking for novel alternatives, herein, hADMSCs were isolated from adipose tissue and co-cultured with human monocytes ex vivo. Results: A new fused hybrid entity, a foam hybrid cell (FHC), which was CD90+CD14+, resulted from this co-culture and was observed to have enhanced motility, proliferation, immunomodulation properties, and maintained stemness features. Conclusions: Our study demonstrates the generation of a new hybrid cellular population that could provide migration advantages to MSCs, while at the same time maintaining stemness properties.

Superb electromagnetic shielding polymer nanocomposites filled with 3-dimensional p-phenylenediamine/aniline copolymer nanofibers@copper foam hybrid nanofillers

The polymer nanocomposites with 3-dimensional (3D) nanofillers can form a 3D network and attain a uniform distribution of nanofillers, which benefits the transfer of charge carriers and phonons as well as the dispersion of stress at a very low loading of nanofillers. These polymer nanocomposites with high mechanical properties would have great potential for thermal and electrical conduction as well as electromagnetic interference (EMI) shielding. In this paper, the 3D epoxy nanocomposites are manufactured by stuffing epoxy resin into 3D p-phenylenediamine-aniline copolymer nanofibers@Cu foam (P-PANI@f-Cu) hybrid nanofillers that are constructed by electrophoretic deposition of phosphoric acid doped P-PANI copolymer nanofibers onto the surface of sodium hydroxide oxidized Cu foam. Benefiting from 3D continuous network of P-PANI@f-Cu hybrid nanofillers, the electrical conductivity and thermal conductivity of 3D P-PANI@f-Cu/epoxy nanocomposites with the P-PANI loading of 0.262 wt% could achieve 7.71 ± 0.04 S cm−1 and 5.4670 ± 0.0085 W m−1K−1, respectively, which are much better than that of pure epoxy (insulator and 0.2310 ± 0.0017 W m−1K−1, respectively) and epoxy composites filled with only Cu foam (4.46 ± 0.03 S cm−1 and 2.7907 ± 0.0057 W m−1K−1, respectively). Meanwhile, with a thickness of 1.8 mm, the average total EMI shielding effectiveness (SET) of 3D P-PANI@f-Cu/epoxy nanocomposites in the X-band range reaches a high value of 66.14 dB, which is capable of effectively shielding the electromagnetic signal between Bluetooth earphone and smartphone in the practical application. Furthermore, the 3D P-PANI@f-Cu hybrid nanofillers can efficiently prevent the crack growth in the epoxy nanocomposites and improve their mechanical properties including hardness and elastic modulus.

Ultralight, compressible and superhydrophobic hybrid foam with highly efficient electromagnetic interference shielding in damping and high humidity environment

To expand the application range of electromagnetic interference (EMI) shielding materials, it has become an urgent issue to achieve the excellent shielding effectiveness (SE) in extreme environment. In this paper, an ultralight, compressible and superhydrophobic foam composed of melamine foam (MF), Ti 3 C 2 T x MXene and polydimethylsiloxane (PDMS) was constructed via the facile dipping and vacuum-assisted impregnation method. The MF as a skeleton can provide coated substrate for MXene sheets to realize the 3D conductive network. Meanwhile, the PDMS layer of MF/MXene/PDMS (MFMP) foam can enhance the stability and durability of its structure and capability. The obtained MFMP foam possesses the very low reduction (less than 10%) of compressive stress at a high strain of 60% after 200th compression cycles. More importantly, the MFMP foam also shows an ultrahigh absolute SE of 29088 dB cm 2 g −1 due to its excellent SE of 44.66 dB and ultralow density of 9.22 mg cm −3 . The retention rate of SE can be maintained over 85% under the different treatment of serve environment. This strategy offers a promising idea to construct the ultralight porous materials for highly efficient EMI shielding applications in damping and high humidity environment. • MFMP has superhydrophobicity. • MFMP with of 9.22 mg cm -3 possesses ultrahigh SSE/t of 29088 dB cm 2 g -1 . • MFMP exhibits shielding stability.

A directional piezoelectric sensor based on anisotropic PVDF/MXene hybrid foam enabled by unidirectional freezing

Directional sensors endowed by inherent anisotropic structure have drawn great attention in intelligent sensing systems. Unidirectional lyophilization is the mainstream technique to architect anisotropic structure particularly for water dispersible systems as the ice template can be readily removed at the melting point of water (0 °C). However, it is impractical for water insoluble polymers such as piezoelectric polymer systems as it features extremely low lyophilization temperature (for instance, −61 °C). So far, no piezoelectric polymer derived anisotropic devices has been realized. In this work, for the first time, we succeeded the constructing of anisotropic PVDF/Mxene device with directionally oriented micropores through delicate formulation design which enables the maintaining of oriented template even at temperature above 0 °C. As a result, the as-fabricated PVDF/Mxene composite foam exhibits distinct anisotropic behavior, featuring compressive modulus along the direction of penetrating microchannels being approximately 1.7 times of that in the orthogonal direction. The anisotropic foam is applied as directional sensor with piezo-current as the output signal, which displays a 3.93-fold higher sensitivity difference in the direction perpendicular to the microchannel than in its orthogonal direction. Moreover, the foam exhibits the highest sensitivity of 41.3nA/kPa over pressure range of 2.5–20 kPa, which outperforms state-of-the-art polymer piezoelectric sensors. This novel strategy provides a practical avenue for architecting water-insoluble polymer-derived devices with anisotropic structure in a green and energy-saving manner, which could spur innovations from the fields of electromagnetic interference shielding, energy storage, piezoresistive, thermal insulation and so on wherever anisotropic characteristic is desired.

Superior electromagnetic wave absorption performance of Fe3O4 modified graphene assembled porous carbon (mGAPC) based hybrid foam

High performance Fe3O4 modified graphene assembled porous carbon (mGAPC) based epoxy paint coated on Polyethylene (PE) foam is realized by spray technique to fabricate light weight electromagnetic absorbers. The mGAPC as a pigment in a standard composition of commercial paint was optimized and the influence of solvent and additives are studied to achieve X-band (8.2–12.4 GHz) electromagnetic wave absorption (EA) in the hybrid foam (HF). From the comparative studies, the hybrid foams obtained from epoxy paint with toluene as solvent (without Mn-octate as additive) showed a Reflection Loss (RL) −19 dB (in the range of 8.3–8.7 GHz), which was further increased with the coating cycles up to −43 dB (in 10.2–11.2 GHz).The observed rise is attributed to increase in localized interfacial polarization that arises at the combined interfaces of mGAPC. The result showed 99% loss, which projects a promising EA paint for practical applications. Further thickness dependent studies of EA in Paint Coat HF1, reveals that with increasing thickness from 0.3 to 2 mm, the RL also increases from −19 to −43 dB with changing absorption band. The superior EA properties are correlated to the percolation threshold, pigment dispersibility and further correlated to the strong absorption, destructive interference, multiple internal reflections and interfacial polarization of the radiation in the hybrid foam. Moreover, considering the paint lowest thickness ∼0.3 mm with −19 dB of RL, the hybrid foam promises a cost-effective, fine, light-weight EA/RL material for secure electronic devices and packaging in civil and defence applications.

Multifunctional Carbon-Based Hybrid Foams for Shape-Stabilization of Phase Change Materials, Thermal Energy Storage, and Electromagnetic Interference Shielding Functions

Carbon-red mud foam/paraffin hybrid materials were prepared and studied for their thermal energy storage and electromagnetic interference (EMI) shielding properties. The host matrices were prepared utilizing the polymeric foam replication method, with a polyurethane sponge as a template, resin as a carbon source, and red mud as a filler. The paraffins, n-octadecane (OD) and the commercial RT18HC, were used as organic encapsulant phase change materials (PCMs) into the open pore structure of the foams. The foams’ morphological and structural study revealed a highly porous structure (bulk density, apparent porosity P > 65%), which exhibits elliptical and spherical pores, sized from 50 up to 500 μm, and cell walls composed of partially graphitized carbon and various oxide phases. The hybrid foams showed a remarkable encapsulation efficiency as shape stabilizers for paraffins: 48.8% (OD), 37.8% (RT18HC), while their melting enthalpies (ΔHm) were found to be 126.9 J/g and 115.5 J/g, respectively. The investigated hybrids showed efficient electromagnetic shielding performance in frequency range of 3.5–9.0 GHz reaching the entry-level value of ~20 dB required for commercial applications, when filled with PCMs. Their excellent thermal and EMI shielding performance places the as-prepared samples as promising candidates for use in thermal management and EMI shielding of electronic devices as well.

Assembly‐In‐Foam Approach to Construct Nanodiamond/Carbon Nanotube Hybrid Monolithic Carbocatalysts for Direct Dehydrogenation of Ethylbenzene to Styrene

AbstractSustainable nanocarbon catalysts have made measurable progress in ethylbenzene direct dehydrogenation (DDH). Thanks for the distinctive physical and chemical properties of Nanodiamond (ND), the considerable attention have been paid to diverse catalytic transform processes involving the DDH reaction. However, the powder‐form carbon cannot be directly used in fixed‐bed reactors owing to the resulting huge pressure drop. Herein, inspired by the ship‐in‐boat strategy, we present an ingenious assembly‐in‐foam approach for the preparation of a novel hybrid structured monolithic catalyst featuring an aerogel of sulfur‐doped nanodiamonds/carbon nanotubes hybrid within the macropores of SiC foam (ND−CNT−SDS/SiC) by heating the freeze‐dried macroporous hybrid gels composed of CNT, ND, and SDS in N2 atmosphere. Owing to the promoted NDs dispersion, strengthened mass transfer, and sulfur‐doping, the nanodiamonds/carbon nanotube hybrid foam monolithic catalyst exhibits a terrific catalytic performance with high stability for energy‐saving styrene production from DDH of ethylbenzene reaction, as well as overcoming the shortcomings of application of powder‐formed nanocarbon in heterogeneous catalysis. Furthermore, the emerging Assembly‐in‐Foam way for preparing nanocarbons‐based foam monolithic catalyst towards diverse chemical processes has been paved.

Applicability of correlated digital image correlation and infrared thermography for measuring mesomechanical deformation in foams and auxetics

AbstractCellular materials such as metal foams or auxetic metamaterials are interesting microheterogeneous materials used for lightweight construction and as energy absorbers. Their macroscopic behavior is related to their specific mesoscopic deformation by a strong structure‐property‐relationship. Digital image correlation and infrared thermography are two methods to visualize and study the local deformation behavior in materials. The present study deals with the full‐field thermomechanical analysis of the mesomechanical deformation in Ni/PU hybrid foams and Ni/polymer hybrid auxetic structures performing a correlative digital image correlation and infrared thermography. Instead of comparing and correlating only the primary output variables of both methods, strain and temperature, also strain rates and temperature rates occurring during deformation were compared. These allow for a better correlation and more conclusive results than obtained using only the primary output variables.

Porous and conductive cellulose nanofiber/carbon nanotube foam as a humidity sensor with high sensitivity

In this study, we developed a humidity sensor with high sensitivity based on cellulose nanofiber/carbon nanotube (CNF/CNT) hybrid foam. The porous structure of the foam not only provides more contact interface for water molecules adsorption, but also tunes the conductivity of the CCF closed to the point where the sensor is most sensitive to the change in humidity. With this porous structural design, the obtained foam sensor shows a high humidity sensitivity of 87.3% (ΔI/I0, and the response limit is 100%), excellent linearity (R2 = 0.996) within the humidity range from 29 to 95% relative humidity (RH), and good long-time stability (more than two months). Furthermore, the water vapor adsorption behavior of the CNF/CNT foam sensor can be well described by the pseudo-first-order kinetic model. Finally, a simple humidity measuring device based on the CNF/CNT foam is presented, which can find good applications for human breath and fingertip humidity monitoring.

Investigation of the Structural Coating Homogeneity in Open‐Porous Nickel/Polyurethane Hybrid Foams Produced by Flow‐Controlled Electrodeposition

In today's world, the saving of raw materials together with the reduction of emissions necessitates the development of new, customized and application‐oriented materials which fulfill various requirements at the same time. Metal foams achieve a high strength combined with low weight. The present work deals with a flow‐controlled production technique for hybrid foams to deposit a nanocrystalline nickel (Ni) layer on pre‐treated, open‐porous polyurethane (PU) foams. The analysis of the resulting coating thickness distributions with gravimetric and microscopic methods shows the qualitative and quantitative influences on the local deposition by varying the process parameters. For the first time, the coating thickness distribution of Ni/PU hybrid foams is investigated regarding the analysis of a global and local homogeneity. The comparison of experimental data with simulated flow velocity profiles leads to an estimation of the correlation between flow velocity, anode distance, and coating thickness distribution, which represents the mass transport. The correlations show, that the coating process is strongly controlled by the electrolyte's flow velocity as well as the distribution of the electric field.

Influences of reinforcement size and artificial aging on the compression features of hybrid ceramic filled aluminum syntactic foams

Over the past years, the number of scientific efforts on aluminum matrix syntactic foams (AMSFs) has increased in a noteworthy manner, and different investigation teams have tried to figure out the physical, microstructural, and mechanical properties of AMSFs. In this paper, different from the previous valuable efforts, an industrial-focused cold chamber die casting machine was utilized during the fabrication instead of commonly used lab-scale techniques. Also, the effects of the reinforcement diameter on the compressive features were analyzed for pumice and expanded glass-added hybrid AMSFs. To ascertain the mechanical properties, quasi-static compression tests were conducted and stress–strain curves were obtained. During the compression tests, the deformation styles of the hybrid foams were followed to comprehend their damage mechanisms. Moreover, half of the samples were subjected to artificial aging treatment and the results were checked up with as-cast samples. According to experimental outcomes, it was obvious that the artificial aging treatment caused superior mechanical properties and triggered brittle-style deformation.

Physical and mechanical properties of hybridized elastomeric foam based on ethylene-propylene-diene-monomer, multiwall carbon nanotube, and barium titanate

The use of hybrid fillers in rubbers can provide additional benefits to rubber foams compared to individual micro- or nano-scale particles due to an optimum packaging and synergic effects. The present work reports the development of vulcanized ethylene-propylene-diene-monomer nanocomposite hybrid foams filled with barium titanate and multiwall carbon nanotube (BT/MWCNT), prepared via a scalable protocol. The developed foams presented a high shear-thinning behavior, suggesting the formation of a 3D interconnected physical network of MWCNT within the polymer matrix. This network resulted in a notable improvement of the mechanical properties under tension and compression with increasing of MWCNT content. Also, the incorporation of MWCNT and BT enhanced thermal stability and thermal conductivity. Meanwhile, BT did not show any influence on the measured physical properties, due to the lack of interaction between BT and the EPDM matrix.

Compressive Property and Energy Absorption Capacity of Mg-Ceramic-Ni Foamsat Various Temperatures

Mg–Ceramic–Ni hybrid foams were fabricated via continuousdepositing micro-arc oxidation (MAO) ceramic coating and electroless Ni coating on the surface of the AZ91D foam struts. Mechanical tests from room temperature (RT) to 300 °C were carried out to evaluate the compressive properties and energy absorption capacities of two types of foams, i.e., AZ91D alloy foams and corresponding hybrid foams. The effect of composite coatings and test temperature on the compressive property of the foams was studied. The experimental results show that the MAOand Ni coatings enhance the Mg foam struts, resulting in high compressive strength and energy absorption capacity at each testing temperature. In addition, the compressive properties are also depending on testing temperature. The different mechanical responses of the composite foams under various temperature conditions are mainly attributed to the different deformation behaviors and failure modes of the foam struts, which are confirmed by scanning electron microscopy (SEM) observation.

Graphene oxide-covered melamine foam utilizing as a hybrid foam toward organic dye removal and recyclability

Graphene-based adsorbents have been attracted extensive interest in recent years. Herein, graphene oxide-covered melamine foam (GO-covered MF) was designed and prepared by a mild submerge-covering method with the support of a super-hydrophilic melamine framework, showing its adsorption performances for various organic dyes. The structure morphology as well as chemical, thermal and mechanical properties of the as-obtained hybrid foam (HF) were further determined for the possible structure changes after covering the GO sheets on the MF framework. Moreover, the HF exhibited an excellent ability for organic dye adsorption application, and which was well fitted in the pseudo-second-order kinetic and Langmuir models corresponding to a chemical adsorption and a mono-layer approach during the adsorption process. The maximum adsorption capacity by using the as-obtained HF corresponded to 258.56 ​mg ​g−1 (methylene blue), 233.22 ​mg ​g−1 (Rhodamine B), 206.92 ​mg ​g−1 (methyl orange), and 184.93 ​mg ​g−1 (Congo red), which are competitive with that of other graphene-based absorbents. In particular, the HF could be reused without a noticeable degradation of organic dye removal performance. As such, the HF prepared in this study can become an encouraging candidate for practical application owing to the reliable recyclability and low-cost.

Cryogenic-environment resistant, highly elastic hybrid carbon foams for pressure sensing and electromagnetic interference shielding

Elastic carbon foams are promising material candidates for various applications, including strain/pressure sensing and electromagnetic interference (EMI) shielding, but typically suffer from brittleness, low sensitivity, narrow pressure detection range, and poor performance stability. Herein, a facile and scalable method was demonstrated to fabricate carbon nanotube (CNT) embedded carbonized melamine foams (CNT/CMFs) by a direct pyrolysis process. The hybrid CNT/CMFs show tunable electrical conductivity while providing ultrahigh elasticity even under deep cryogenic conditions (−196 °C). An ultrahigh sensitivity (up to 103.24 kPa−1) and a broad pressure detection range (0–175 kPa) were achieved by the hybrid foam sensors, attributing to the hierarchical structures composed of a nanofibrous CNT layer and macropores. The foam-based sensors exhibit ultrahigh cryogenic-temperature resistance, which retains stable performance after immersing in liquid nitrogen for 36 h and experiencing 5000 cycles of repeated compression-release. Moreover, the CNT/CMFs show an exceptional EMI shielding effectiveness and a high specific shielding effectiveness of 6147.3 dB cm2 g−1 with an absorption-dominant shielding mechanism due to the highly porous structure. The cryogenic-temperature resistant CNT/CMFs with these superior strain/pressure sensing and EMI shielding performance are promising for their practical applications as wearable electronics operating in both mild and harsh environments.

Low-Velocity Impact Behavior of Foam Core Sandwich Panels with Inter-Ply and Intra-Ply Carbon/Kevlar/Epoxy Hybrid Face Sheets.

Sandwich composites are extensively employed in a variety of applications because their bending stiffness affords a greater advantage than composite materials. However, the aspect limiting the application of the sandwich material is its poor impact resistance. Therefore, understanding the impact properties of the sandwich structure will determine the ways in which it can be used under the conditions of impact loading. Sandwich panels with different combinations of carbon/Kevlar woven monolithic face sheets, inter-ply face sheets and intra-ply face sheets were fabricated, using the vacuum-assisted resin transfer process. Instrumented low-velocity impact tests were performed using different energy levels of 5 J, 10 J, 20 J, 30 J and 40 J on a variety of samples and the results were assessed. The damage caused by the modes of failure in the sandwich structure include fiber breakage, matrix cracking, foam cracking and debonding. In sandwich panels with thin face sheets, the maximum peak load was achieved for the inter-ply hybrid foam core sandwich panel in which Kevlar was present towards the outer surface and carbon in the inner surface of the face sheet. At an impact energy of 40 J, the maximum peak load for the inter-ply hybrid foam core sandwich panel was 31.57% higher than for the sandwich structure in which carbon is towards the outer surface and Kevlar is in the inner surface of the face sheet. The intra-ply hybrid foam core sandwich panel subjected to 40 J impact energy demonstrated a 13.17% higher maximum peak load compared to the carbon monolithic face sheet sandwich panel. The experimental measurements and numerical predictions are in close agreement.

Flexible, all-solid-state supercapacitors derived from waste polyurethane foams

Recently, flexible energy storage devices have attracted increasing interests for their promise in wearable electronic devices. In this study, the waste polyurethane foam (WPUF), a common polymeric waste having caused considerable environmental pollutions, is employed for the first time in the fabrication of flexible electrodes through wrapping carbon nanotubes (CNTs) and cellulose nanofibers (CNFs), pressing into thin foams with molds and in-situ growth of polyaniline (PANI). Within the hybrid foam, the CNT/CNF layer provides good electrical conductivity and hydrophilicity, while the highly porous structure still retained after appropriate hot pressing offers numerous pathways for efficient electrolyte ions transportation, and the loaded polyaniline is mainly responsible for the improved electrochemical capacitive properties. A symmetrical all-solid-state SC is assembled using the as-prepared WPUF-derived electrode, which displays superb physical and electrochemical performances, namely, excellent flexibility, high specific capacitance, and great stability at different bending angles. Interestingly, a flexible neat polyurethane membrane can also be easily prepared from WPUF via hot pressing, which is then applied to encapsulate SC to form a novel all-WPUF-based energy wristband to power an electronic watch. This study demonstrates a facile and scalable strategy for the fabrication of high-performance electrodes for wearable electronic devices, using the abundant polymeric wastes as the raw materials.