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Joule-heat derived amorphous/graphitic polymer nanotubes with enhanced electromagnetic wave absorption and high thermal conductivity
(Elsevier BV, 2025-05-16)
Yang Cao
;
Xinfei Zeng
;
Jingtao Su
;
Wentao Yu
;
Haichen Zhang
The rapid advancement of artificial intelligence demands multifunctional materials integrating electromagnetic wave absorption (EWA) and thermal management capabilities for next-generation electronics. Herein, a facile and scalable Joule-heating carbonization strategy is proposed to regulate the amorphous-to-graphitic phase ratio in polymer nanotubes, achieving a precise modulation of EWA performance. The nitrogen species transformation during carbonization induced enhanced polarization relaxation, defect generation, and dipole polarization, synergistically facilitating charge transfer. Polypyrrole-based polymer nanotubes treated at 1000 o C (PNT-1000) exhibited a maximum effective absorption bandwidth of 3.46 GHz and a minimum reflection loss of −45.1 dB. Moreover, PNT-1000@polydimethylsiloxane (PDMS) demonstrated a thermal conductivity of 2.26 W/(mK), while PNT-2000@PDMS achieved a significantly higher thermal conductivity of 4.20 W/(mK). This work systematically elucidated the interaction between amorphous and graphitic phases in controlling both EWA and thermal conductivity, which is helpful for applying carbon-based materials in these advanced fields.
Цитирования (OpenAlex) 68Цитирования (OpenCitations) 43
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Coaxial electrospun PEG-4000@PVDF composite membranes with intumescent flame retardants: Toward multifunctional fabrics for thermal management and ultra-safe lithium-ion battery separators
(Elsevier BV, 2025-07-18)
Yongshuang Xiao
;
Jiahui Lin
;
Yang Cao
;
Xin Liu
;
Hao Wang
• Multifunctional core-shell fiber films were prepared by one-step coaxial electrospinning technique. • Efficient halogen-free synergistic intumescent flame retardant system. • Films exhibit superior phase-change enthalpy, shape stability and flame retardant properties. • Core-shell dual functionality enables simultaneous thermal regulation and flame retardancy for fabrics and lithium-ion battery separators. Phase change materials (PCMs) like PEG-4000 offer high heat storage density and can isothermally store or release energy. However, there are fatal safety problems, such as leakage and flammability during transition, which greatly limit the practical application. To address these issues, coaxial electrospinning was employed to fabricate multifunctional core–shell structured fibers, encapsulating PEG-4000 within a polyvinylidene fluoride (PVDF) shell integrated with halogen-free intumescent flame retardants (IFR). The resulting PEG-4000@PVDF-IFR (PPI) composite fibers exhibit superior thermal stability, shape stability, and flame retardancy. Among them, PPI-3 exhibits a synergistic flame-retardant effect, with a high storage density of 92.26 J g −1 and a V-0 rating in modified UL-94 tests. Compared to PEG-4000, PPI-3 reduces the total heat release (THR) by 51.59 % and increases the char residue from 1.51 % to 15.15 %, significantly enhancing the flame retardancy. The PPI coaxial fiber membrane, featuring a well-designed core–shell structure, combines high porosity, large specific surface area, and superior flexibility, simultaneously enhancing traditional textile comfort and thermal regulation while effectively mitigating thermal runaway risks in lithium-ion batteries. In conclusion, PPI shows considerable potential for application in thermal management applications.
Цитирования (OpenAlex) 75Цитирования (OpenCitations) 36

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