Skinless porous films generated by supercritical CO2 foaming for high-performance complementary shaped triboelectric nanogenerators and self-powered sensors

Ni, Gaolei; Zhu, Xiaoshuai; Mi, Hao‐Yang; Feng, Pingyun; Li, Jun; Jing, Xin; Dong, Binbin; Liu, Chuntai; Shen, Changyu

doi:10.1016/j.nanoen.2021.106148

Cited by 41 publications

(28 citation statements)

References 50 publications

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“…CAE software has developed into a powerful tool for assisting practical and industrial injection molding manufacturing, which has helped to save primary experimental cost and time cost, especially in the cases of high-cost materials, such as engineering plastics and polymer nanocomposites. [23,24] To acquire the suitable processing parameters for the injection molding experiments of PEEK, a series of simulations were conducted using the Moldflow software, which has an SCF foaming package, by establishing a simulation model with the same geometry as the cavity of the mold used in the experiment. Univariate and multivariate models were built among the key processing parameters including melting temperature, mold temperature, cooling time, and N 2 content.…”

Section: Moldflow Simulationmentioning

confidence: 99%

Fabrication of Polyether–Ether–Ketone Foams with Superior Properties and Mitigated Weld Lines by Microcellular Injection Molding

Feng

Wang

et al. 2021

Adv Eng Mater

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Polyether–ether–ketone (PEEK) as an engineering plastic with excellent mechanical properties requires strict processing conditions. Introducing microcells in PEEK parts is beneficial for reducing the material cost and improving their tenacity. Herein, foamed PEEK parts are fabricated using microcellular injection molding with supercritical nitrogen as the blowing agent. Using optimum processing conditions obtained from orthogonal array experiments based on finite‐element simulation, the foamed PEEK parts achieve a 10% average weight reduction and display a typical sandwich structure with an average cell size of 30 μm in the core region. The cell size is larger, whereas the cell density and skin layer thickness are smaller in the region near the gate than the region far from the gate. The foamed PEEK parts show a slight drop in the tensile modulus and tensile strength but a significant improvement in the elongation at break when compared with the solid parts. Moreover, the foamed PEEK parts with weld lines exhibit less reduction in tensile properties than the solid counterparts, attributed to their tighter interfacial adhesion at the weld line. This study successfully produces foamed PEEK parts with high weight reduction and ductility and provides insights into the weld line mitigation through microcellular injection molding.

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Section: Moldflow Simulationmentioning

confidence: 99%

Fabrication of Polyether–Ether–Ketone Foams with Superior Properties and Mitigated Weld Lines by Microcellular Injection Molding

Feng

Wang

et al. 2021

Adv Eng Mater

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“…[4][5][6] ScCO 2 foamed TPU has advantages of low density, good resilience, insulation, nontoxic, cushioning, and energy absorption. 7,8 The performance of TPU foam is mainly affected by the material composition and the cellular structure. Wang et al fabricated TPU foams with widely tunable cell structures and mechanical properties using a heating ramp foaming approach and cooling ramp foaming approach.…”

Section: Introductionmentioning

confidence: 99%

“…Producing TPU foams using scCO 2 foaming is a cost‐effective green approach that has been widely used in the production of sports shoe soles, cushion gaskets, packaging and transportation, automotive interiors, and medical products 4–6 . ScCO 2 foamed TPU has advantages of low density, good resilience, insulation, nontoxic, cushioning, and energy absorption 7,8 …”

Section: Introductionmentioning

confidence: 99%

Graphene oxide/thermoplastic polyurethane wrinkled foams with enhanced compression performance fabricated by dynamic supercritical CO₂ foaming

Zhu

et al. 2022

J of Applied Polymer Sci

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Thermoplastic polyurethane (TPU) foams are commonly used buffering materials due to their lightweight, high elasticity, and excellent energy absorption properties. Improving their compressive property without increase foam density is a challenge for TPU foams. Herein, graphene oxide (GO)/TPU composite foams containing micro‐sized wrinkles on the cell surface were fabricated by a novel dynamic supercritical carbon dioxide (scCO2) foaming method. The addition of GO created hydrogen bonding and physical crosslinking sites with the TPU molecules, which acted as nucleation agents to improve the cell density of the GO/TPU foams. With the increase of GO content, the mechanical properties of GO/TPU foams were significantly enhanced, and the wrinkled foams prepared via dynamic scCO2 foaming displayed superior compressive modulus, strength, energy absorption, and recoverability compared with the counterpart foams without wrinkly structure. The wrinkled GO/TPU foams with 0.5 wt% GO revealed higher expansion ratio, lower foam density, superior compressive property and energy absorption than both neat TPU and 1 wt% GO foams owing to the reinforcing effect of the wrinkly structure. This study is of great significance in the development of low‐density composite foams with enhanced compressive performance by wrinkly structures.

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“…Currently, PPMs have received considerable attention since they can promote the development of structuring technologies for the next generation of construction, automotive, aerospace, medical applications, communication device, and triboelectric nanogenerator, etc. [ 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Lightweight Polyethylene/Hexagonal Boron Nitride Hybrid Thermal Conductor Fabricated by Melt Compounding Plus Salt Leaching

Liu²,

Liao

et al. 2022

Polymers

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Application of porous polymeric materials is severely limited by their ultralow thermal conductivities. Herein, by promoting the formation of thermal conduction pathways, we fabricated open-cellular structured polyethylene/hexagonal boron nitride hybrid thermal conductors via melt compounding plus salt leaching. The structural analyses indicate that the inclusion of hBN can enhance the open-cell level of resultant materials. X-ray diffractions confirm the high in-plane alignments of hBN in each sample. Consequently, the test results evidence the superior thermal conductivities of our samples, and the thermal conductivities of each sample are characterized as functions of hBN loadings. Ultimately, our advanced porous thermal conductor with a low hBN loading of 3.1 vol% exhibits a high specific thermal conductivity of 0.75 (W/mk)/(g/cm3), which is 82.9% higher than virgin PE and far higher than bulk PE/hBN composites. Our work also intends to reveal the architectural advantages of open-cellular, as compared with the close-one, in fabricating porous materials with highly interconnected fillers.

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Skinless porous films generated by supercritical CO2 foaming for high-performance complementary shaped triboelectric nanogenerators and self-powered sensors

Cited by 41 publications

References 50 publications

Fabrication of Polyether–Ether–Ketone Foams with Superior Properties and Mitigated Weld Lines by Microcellular Injection Molding

Fabrication of Polyether–Ether–Ketone Foams with Superior Properties and Mitigated Weld Lines by Microcellular Injection Molding

Graphene oxide/thermoplastic polyurethane wrinkled foams with enhanced compression performance fabricated by dynamic supercritical CO₂ foaming

Lightweight Polyethylene/Hexagonal Boron Nitride Hybrid Thermal Conductor Fabricated by Melt Compounding Plus Salt Leaching

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Skinless porous films generated by supercritical CO2 foaming for high-performance complementary shaped triboelectric nanogenerators and self-powered sensors

Cited by 41 publications

References 50 publications

Fabrication of Polyether–Ether–Ketone Foams with Superior Properties and Mitigated Weld Lines by Microcellular Injection Molding

Fabrication of Polyether–Ether–Ketone Foams with Superior Properties and Mitigated Weld Lines by Microcellular Injection Molding

Graphene oxide/thermoplastic polyurethane wrinkled foams with enhanced compression performance fabricated by dynamic supercritical CO2 foaming

Lightweight Polyethylene/Hexagonal Boron Nitride Hybrid Thermal Conductor Fabricated by Melt Compounding Plus Salt Leaching

Contact Info

Product

Resources

About

Graphene oxide/thermoplastic polyurethane wrinkled foams with enhanced compression performance fabricated by dynamic supercritical CO₂ foaming