Batch foaming of carboxylated multiwalled carbon nanotube/poly(ether imide) nanocomposites: The influence of the carbon nanotube aspect ratio on the cellular morphology

Yu, Haitao; Lei, Yajie; Yu, Xuejiang; Wang, Xianzhong; Liu, Tao; Luo, Siwei

doi:10.1002/app.42325

Cited by 10 publications

(10 citation statements)

References 29 publications

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“…Compared with PEI, the PEI–CNT nanocomposite showed similar CO 2 absorption behaviors, but the maximum absorption decreased. This might have been due to the lack of absorption of CNTs on CO 2 and the steric hindrance effect of CO 2 on PEI, which blocked the entrance of CO 2 into the PEI matrix and the formation of good interactions between CO 2 and the carbonyl groups of PEI . To improve CO 2 absorption, a higher saturation temperature would be needed.…”

Section: Resultsmentioning

confidence: 99%

“…Among which, the introduction of a small number of nanoparticles has received increasing attention in both research and practice . For example, Yu et al . used carboxyl‐group‐functionalized multiwalled carbon nanotubes (MWCNT–COOHs) with different aspect ratios to prepare microcellular and nanocellular PEI foam sheets via the solid‐state foaming method.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and cell morphology of a microcellular poly(ether imide)–carbon nanotube composite foam with a three‐dimensional shape

Feng

2019

J of Applied Polymer Sci

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The preparation of microcellular poly(ether imide) (PEI) based foams with three-dimensional geometry remains a great challenge worldwide. In this study, we fabricated microcellular PEI-carbon nanotube (CNT) bead foams with a batch rapid depressurization method in a self-designed mold with supercritical carbon dioxide (scCO 2 ) as a blowing agent. The effects of the saturation time, foaming temperature, foaming pressure, and depressurization rate on the microcellular structures of the PEI foam were analyzed by the Taguchi approach to determine the optimum foaming conditions, and the influence of the CNT content on the cell structure was analyzed. The results show that the depressurization rate and foaming temperature were the key factors influencing the cell size and cell density (N f ); that is, the high depressurization rate and low foaming temperature favored a small cell size and high N f . The foaming temperature also influenced the foaming ratio (ϕ), and a high ϕ was obtained at a high foaming temperature. Under optimal foaming conditions, PEI with 2.0 wt % CNTs presented the best cell structure; N f , cell size, and ϕ were 6.14 × 10 10 cell/cm 3 , 2.43 μm, and 2.08, respectively. The mechanical properties of the final parts were related more to the foaming time and CNT concentration, and the maximum tensile and compression strength were reached at 3 h foaming time and 2.0 wt % CNT, that is, at 2.75 and 15.1 MPa (10% strain), respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication and cell morphology of a microcellular poly(ether imide)–carbon nanotube composite foam with a three‐dimensional shape

Feng

2019

J of Applied Polymer Sci

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“…Among these nanoparticles, carbon nanotubes (CNTs) have attracting great attention in material, physical and chemistry areas because of its remarkable mechanical, thermal and electoral properties in the past decade . Especially, due to their large aspect ratio, high specific surface area, and superior properties, CNTs have been used to reinforce the nanocomposites foams in a wide range of polymers, such as polycarbonate (PC), polypropylene (PP), polystyrene (PS), poly(ether imide) (PEI), and poly(methyl methacrylate) (PMMA) for the purpose of leading to an increased cell density and improving mechanical and electromagnetic shielding properties. However, some drawbacks limit its range of applications.…”

Section: Introductionmentioning

confidence: 99%

Graphene nanoribbons (GNRs) by unzipping MWCNTs for the improvement of PMMA microcellular foams

Cheng

Luo

et al. 2017

J of Applied Polymer Sci

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This work presents the cellular microstructures and properties of PMMA/graphene nanoribbons (GNRs) microcellular foams. GNRs were obtained by oxidative unzipping multiwalled carbon nanotubes and solvent thermal reduction in dimethylformamide (DMF), then they were mixed with PMMA to fabricate PMMA/GNRs nanocomposites by solution blending. Subsequently, supercritical carbon dioxide (scCO2) as a friendly foaming agent was applied to fabricate PMMA/GNRs microcellular foam by a batch foaming in a special mold. The morphology of cell structure was analyzed by scanning electron microscopy and image software, showing that the addition of a smaller content of GNRs caused a fine cellular structure with a higher cell density (∼3 × 1011 cells/cm3) and smaller cell sizes (∼1 μm) due to their remarkable heterogeneous nucleation effect. The mechanical testing of PMMA/GNRs microcellular foams demonstrated that the obtained GNRs also could be used as a reinforcing filler to increase the mechanical properties of PMMA foams. An improvement in the compressive strength of ∼80% (about 39% increase standardized by specific compressive strength) was achieved by 1.5 wt % GNRs addition, and the thermal stability of PMMA/GNRs foams was enhanced too. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45182.

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“…Carbon nanotubes (CNTs) as a new type of nanomaterial, are long cylindrical graphite sheets with or without hemifullerene end caps and are composed of covalently bonded carbon atoms . CNT have the advantages of small size, large surface area, and high aspect ratio, which utilize polarization at interfaces and multiple scattering as primary electromagnetic wave absorbing mechanism . As a promising dopant, it has been widely used together with many kinds of polymer matrix material to form composite RAMs .…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing of carbon nanotube‐photopolymer composite radar absorbing materials

Zhang

Yang

et al. 2016

Polymer Composites

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Additive manufacturing (AM) including Stereolithography (SLA) and more recent 3D printing derivatives is an innovative manufacturing technology, where objects can be manufactured by accumulation of successive layers of materials. Such technology enables the fabrication of highly customized radar absorbing materials (RAM) and novel RAM structures. The microwave absorption, printability, complex electromagnetic parameters were measured, acrylic ester photopolymer with carbon nanotubes (CNTs) content ranging from 0.5% to 1.5% prepared with digital masking AM technology. Good dispersion and the content of CNTs have major influences on the successful preparation. The printability limit of multiwalled CNT is found to be 1.6%.The maximum absorption of 6 mm‐thick composites is measured to be −15.98 dB with 1.5% CNT content. The real part ( ε′) of permittivity increases from 2.5 to 7 and the imaginary part ( ε″) of permittivity increases from 0.2 to 1.0 with the increasing content of CNTs. Frequencies, thickness, uniformly distribution of CNT and CNT content are the main factors affecting the RAM properties. The calculated reflection loss, for 12 mm‐thick composites, are −7 dB, −26 dB, and −34 dB for 0.5%, 1%, and 1.5% of CNT contents, respectively, and the matching frequency shifts to lower frequencies with the increase of thickness or CNT content, which is in agreement with electromagetic theory and experiment results. POLYM. COMPOS., 39:E671–E676, 2018. © 2016 Society of Plastics Engineers

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Batch foaming of carboxylated multiwalled carbon nanotube/poly(ether imide) nanocomposites: The influence of the carbon nanotube aspect ratio on the cellular morphology

Cited by 10 publications

References 29 publications

Fabrication and cell morphology of a microcellular poly(ether imide)–carbon nanotube composite foam with a three‐dimensional shape

Fabrication and cell morphology of a microcellular poly(ether imide)–carbon nanotube composite foam with a three‐dimensional shape

Graphene nanoribbons (GNRs) by unzipping MWCNTs for the improvement of PMMA microcellular foams

Additive manufacturing of carbon nanotube‐photopolymer composite radar absorbing materials

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