Polyacrylonitrile nanofiber reinforced polyimide composite aerogels with fiber-pore interpenetrating structures for sound absorption, air filtration and thermal insulation

Zhao, Xingyu; Ruan, Kunpeng; Qiu, Hua; Zhang, Yali; Gu, Junwei

doi:10.1016/j.compscitech.2023.110275

Cited by 23 publications

(2 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to further test the superior thermal insulation performance of PI aerogel derived from TPU modification, we performed a comparison of PI-TPU10 aerogel with PI aerogel by drawing on the infrared thermography method . PI aerogel and PI-TPU10 aerogel with a thickness of ca.…”

Section: Resultsmentioning

confidence: 99%

Surface Modification of Polyimide Aerogel by Thermoplastic Polyurethane for Enhanced Mechanical Strength and Thermal Insulation Performance

Zhao,

Su,

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Polyimide (PI) aerogel is a good thermal insulation material with the highest temperature resistance in practical application. But the mechanical strength of PI aerogels prepared by freeze-drying or thermoimide methods is weak. In this research, TPU was selected as an aging solution to solve the problem of the low mechanical strength of PI aerogel prepared by the freeze-drying method. Previous work has certified that the coupling of PI and thermoplastic polyurethane (TPU) can enhance the mechanical strength of PI aerogel to a certain extent due to the flexibility of TPU. But excessive TPU will change the PI structure in the cross-linking process and decrease the mechanical strength of the aerogel. Thus, a new kind of PI gel modification method was provided by using TPU as an aging solution, and the mechanical strength of PI aerogel is improved to 3.06 MPa. Furthermore, the shrinkage, specific surface area, waterproof angle, and thermal conductivity all show good performance, thus enabling PI aerogel to be used in many aspects. Specially, the method is simple and can be used to prepare some other high-strength aerogels.

show abstract

Section: Resultsmentioning

confidence: 99%

Surface Modification of Polyimide Aerogel by Thermoplastic Polyurethane for Enhanced Mechanical Strength and Thermal Insulation Performance

Zhao,

Su,

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Over the past two decades, electronic products have permeated every facet of our daily lives, driven by remarkable advancements in modern technology. − Amidst the pervasive presence of electromagnetic radiation, the adverse consequences of electromagnetic interference (EMI) manifest, resulting in disruptive malfunctions of electronic devices, information security concerns, and potential harm to human well-being. − Leveraging EMI shielding techniques proves highly effective in augmenting the electromagnetic compatibility of electronic devices, thereby mitigating the risks associated with electromagnetic waves (EMWs) and ensuring the optimal functionality of electronic equipment. − Moreover, the unwavering pursuit of miniaturization, elevated power consumption, and advanced integration in electronic devices introduces unprecedented challenges in the development of cutting-edge electromagnetic shielding materials. − EMI shielding materials are primarily classified into two categories: conductive and absorptive materials. Among these, conductive EMI shielding materials exhibit immense potential in the realm of electromagnetic interference shielding. − While traditional metal shielding materials exhibit outstanding shielding performance, their development is constrained by inherent drawbacks such as high density, susceptibility to corrosion, and intricate processing requirements.…”

Section: Introductionmentioning

confidence: 99%

Robust MXene Nanosheet-Based Electromagnetic Interference Shielding Membrane with Cation–π Interactions

Zhuo,

Gou,

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Electromagnetic interference (EMI) shielding is vital for electronic device reliability and combating electromagnetic wave (EMW) pollution. In this research, we employed a vacuumassisted filtration method to fabricate MXene membranes and achieved the construction of robust PAA/MXene hybrid membranes by incorporating a polyamic acid (PAA) adhesive containing imidazole rings through cation−π interactions. The integration of PAA led to a reduction in internal pores and the thickness of the MXene membrane, mainly attributed to the reinforcing cation−π interactions that enhance the interlayer forces among the MXene nanosheets. This integration substantially enhances the tensile strength of MXene membranes and concurrently induces alterations in their fracture behavior. Adding a small amount of PAA greatly increased conductivity in the PAA/MXene hybrid membrane, but excessive amounts resulted in a severe decline. When PAA content remained below 2 wt % of MXene nanosheets, the EMI SE T of the PAA/MXene hybrid membrane exhibited minimal fluctuations, consistently exceeding 60 dB. The EMI shielding mechanism of the PAA/MXene hybrid membrane primarily relied on reflection, with reflected electromagnetic waves accounting for over 60% of the incident EMWs. The utilization of cation−π interactions in this approach significantly enhances the interface of MXene nanosheets, thereby holding immense potential for the advanced modification of MXene materials.

show abstract

Synergistically enhanced dielectric properties and thermal conductivity in percolating flaky copper/poly(vinylidene fluoride) nanocomposites via engineering magnesium oxide as a buffer interlayer

Chen,

Zhou,

Meng

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

High dielectric constant (ε), thermal conductivity (TC), and breakdown strength (Eb) along with low loss flexible polymeric nanocomposites display multifunctional applications. In this work, to synergistically bolster the TC and Eb while restraining dielectric loss and leakage current in the percolating flaky copper (f‐Cu)/poly(vinylidene fluoride) (PVDF), presenting a giant ε, the core@shell structured f‐Cu@MgO (magnesium oxide) nanosheets were first created via a chemical precipitation method, then incorporated into host PVDF to explore the MgO shell’ impact on the TC and dielectric properties of the resulting nanocomposites. The introduced MgO interlayer strengthens the interfacial interactions and significantly mitigates the interfacial mismatch in both ε and conductivity between the f‐Cu and PVDF, resulting in elevated TC and Eb of the f‐Cu@MgO/PVDF in comparison to pristine f‐Cu/PVDF. Furthermore, the insulating MgO interlayer introduces deep traps and inhibits the long‐distance migration of electrons, leading to remarkably suppressed dielectric loss. More importantly, the TC and dielectric properties of nanocomposites can be optimized by tuning the MgO thickness. The fitting results via the Havriliak‐Negami equation theoretically support the MgO shell's suppression effect on charge migration and reveal the underlying polarization mechanism in the nanocomposites. The developed nanocomposites with currently high ε, Eb and TC but low loss, present promising applications in electrical power systems.

show abstract

Polyacrylonitrile nanofiber reinforced polyimide composite aerogels with fiber-pore interpenetrating structures for sound absorption, air filtration and thermal insulation

Cited by 23 publications

References 45 publications

Surface Modification of Polyimide Aerogel by Thermoplastic Polyurethane for Enhanced Mechanical Strength and Thermal Insulation Performance

Surface Modification of Polyimide Aerogel by Thermoplastic Polyurethane for Enhanced Mechanical Strength and Thermal Insulation Performance

Robust MXene Nanosheet-Based Electromagnetic Interference Shielding Membrane with Cation–π Interactions

Synergistically enhanced dielectric properties and thermal conductivity in percolating flaky copper/poly(vinylidene fluoride) nanocomposites via engineering magnesium oxide as a buffer interlayer

Contact Info

Product

Resources

About