Metal–organic framework‐derived high‐performance polypyrrole/<scp>Ni‐CAT</scp>/<scp>PI</scp> fiber paper‐based electromagnetic shielding composites for high‐frequency electromagnetic wave absorption

The proliferation of electronic devices and wireless communication in our daily lives has led to a significant increase in electromagnetic pollution. This issue poses a serious threat to the proper functioning of electronic equipment as well as human health. Therefore, the investigation of materials with superior electromagnetic interference (EMI) shielding capabilities has garnered growing interest. In this paper, the mechanisms of EMI shielding were first introduced briefly. It was noted that the development of advanced EMI shielding materials involved adhering to principles such as minimizing reflection loss, enhancing absorption loss, and incorporating multiple internal reflections. The construction and shielding properties of traditional EMI shielding materials were introduced. Unlike metal materials with high densities and reflection loss, lightweight conductive polymer composites (CPCs) have been the most promising EMI shielding materials. Meanwhile, carbon‐based nanofillers such as carbon nanotubes and graphene nanosheets, along with two‐dimensional transition metal carbonitrides MXenes Ti3C2Tx, have emerged as the most promising and versatile conductive nanofillers for CPCs. The EMI shielding performance and loss mechanism of CPCs with homogeneous structure, segregated structure, laminated structure, and porous structure were introduced in detail. It was noted that the EMI shielding performance could be significantly improved by incorporating multiple structures into the same CPCs, such as a rational combination of segregated and porous structures. Finally, the challenges and development trends of CPCs for EMI shielding applications were discussed.Highlights Mechanisms of EMI shielding were introduced from aspect of energy dissipation. Structure–property of traditional EMI shielding materials was described. EMI shielding performance of CPCs with different structures was summarized. Future challenges and growing trends of CPCs for EMI shielding were discussed. Absorption‐dominated loss and multiple structure design were emphasized.

Section: Research Progress Of Emi Shielding Materialsmentioning

confidence: 99%

Recent advances in structural design of conductive polymer composites for electromagnetic interference shielding

Zheng,

Wang,

Zhu

et al. 2023

“…The increased thermal stability of ZIF-67-PET/SBS-MA is attributed to the thermal barrier effect of ZIF-67 nanocrystals, 22 providing a strong and dense, continuous "porous" protective layer for PET fibers through an in situ growth strategy (as confirmed by SEM, AFM, and BET results) and their synergistic effect improved the thermal decomposition of SBS-MA to some extent. 60…”

Section: Characterization Of the Thermal Stability Of Asphaltmentioning

confidence: 99%

Investigating the adhesion and rheological properties of metal organic framework incorporated polyester fiber/zeolite imidazolium salt framework‐67‐modified asphalt composite

He,

Ren,

Muhammad

et al. 2023

Utilizing efficient and cost‐effective modifiers is essential for the development of high‐performance asphalt materials. In this study, a polydopamine (PDA) chelated cobalt ion (Co2+)‐assisted in situ growth strategy was employed to anchor nanoporous zeolite imidazolium salt framework‐67 (ZIF‐67) on polyester (PET) fiber substrates for the preparation of styrene‐butadiene‐styrene block copolymer‐modified asphalt (SBS‐MA). Experimental results indicated that optimal fiber incorporation of 1.5% led to the best interfacial interaction at the modified asphalt fracture section. ZIF‐67 nanoporous structure acted as an organic–inorganic hybridization interfacial layer to enhance the fiber–asphalt interfacial interaction. The adhesion work of the modified fiber with SBS‐MA increased by 42.12%. Furthermore, the adhesion work, peeling work, and compatibility ratio of modified asphalt with aggregates were also improved. Similarly, the complex modulus of the 1.5% ZIF‐67–PDA–PET/SBS‐MA at 46°C was increased by 131.30% in comparison with that of the pristine SBS‐MA. More importantly, the synergistic effect of the highly thermally stable PET fibers and ZIF‐67 nanocrystals improved the thermal decomposition of SBS‐MA. These results suggest that ZIF‐67–PDA–PET fiber holds great promise for application in designing novel materials for the construction industry.

“…Metal-organic framework materials (MOFs), containing metal ions and organic ligands, can form threedimensional (3D) extended structures via corresponding coordination chemical reactions. [29][30][31] Up to now, MOFs have been believed to a cutting-edge porous material after zeolite, carbon nanotubes, and have been extensively employed in catalyst, energy storage, and adsorption, and so forth. [32][33][34] Due to the unique properties of MOFs, different MOFs have been employed to modify fibers for advanced tribological performances.…”

Section: Introductionmentioning

confidence: 99%

Interfacial tailoring of basalt fiber/epoxy composites by metal–organic framework based oil containers for promoting its mechanical and tribological properties

Pan

Liu

et al. 2023

The chemical inertness of the basalt felt (BF) results in a weak interface bonding between BF and polymer matrix, which hinders the further application of BF reinforced composites. In this study, nickel‐based metal–organic framework (Ni‐MOF) sheets were decorated on the surface of BF by a facile one‐step hydrothermal method to improve the interfacial bonding between BF and epoxy resin (EP) matrix and embed solid paraffin. The mechanical and tribological properties of EP composites reinforced with BF were evaluated. The interfacial shear strength (IFSS) between BF and EP was measured by a single‐fiber drawing test, and the results indicated that the IFSS increased by 15.19% after MOF modification. The surface of BF transformed from hydrophilicity to hydrophobicity, therefore significantly improving the compatibility between EP and BF. Compared with pure EP, the composites exhibited improvements of 37.55% and 203.39% in tensile strength and tensile modulus, respectively. Meanwhile, the friction coefficient and specific wear rate of the composite decreased by 58.82% and 56.50%, respectively. The solid paraffin was observed to be enclosed by Ni‐MOF sheets, which endowed the composite with a self‐lubricating behavior during friction. This study will advance the comprehensive performance of EP and provide a versatile strategy for tuning the interface compatibility between the reinforcement material and the matrix. Highlights A novel Ni‐MOF decorated BF was developed for storage of PW. The BF/MOF/PW can simultaneously boost the tribological and mechanical properties of EP. Surface tailoring of BF was realized with decorating MOF sheets and embedding PW. A decline in friction coefficient by 58.82% was achieved.