Absorption-enhanced EMI shielding using silver decorated three-dimensional porous architected reduced graphene oxide in polybenzoxazine composites

Kumaran, R.; Kumar, Amritesh; Ramaprabhu, Sundara; Subramanian, V.

doi:10.1039/d1nj03536c

Cited by 13 publications

(6 citation statements)

References 40 publications

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“…Because strong inter- and intramolecular hydrogen bonds exist after the thermal ROP of BZ units, formed among the tertiary amino and phenolic units in the Mannich bridges, the polymerization products can possess low dielectric constants, low surface free energies, low degrees of shrinkage, and high thermal stabilities and char yields [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Flexibility in molecular design—by varying the structures of the phenolic and amino groups—has allowed the introduction of a range of functional groups (e.g., allyl, propargyl, crown ether) [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ] or inorganic nanomaterials (such as polyhedral oligomeric silsesquioxane, graphene, carbon nanotube) [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ] into the BZ matrix.…”

Section: Introductionmentioning

confidence: 99%

Metal Complexes of the Porphyrin-Functionalized Polybenzoxazine

et al. 2022

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New porphyrin-functionalized benzoxazine (Por-BZ) in high purity and yield was synthesized in this study based on 1H and 13C NMR and FTIR spectroscopic analyses through the reduction of Schiff base formed from tetrakis(4-aminophenyl)porphyrin (TAPP) and salicylaldehyde and the subsequent reaction with CH2O. Thermal properties of the product formed through ring-opening polymerization (ROP) of Por-BZ were measured using DSC, TGA and FTIR spectroscopy. Because of the rigid structure of the porphyrin moiety appended to the benzoxazine unit, the temperature required for ROP (314 °C) was higher than the typical Pa-type benzoxazine monomer (ca. 260 °C); furthermore, poly(Por-BZ) possessed a high thermal decomposition temperature (Td10 = 478 °C) and char yield (66 wt%) after thermal polymerization at 240 °C. An investigation of the thermal and luminescence properties of metal–porphyrin complexes revealed that the insertion of Ni and Zn ions decreased the thermal ROP temperatures of the Por-BZ/Ni and Por-BZ/Zn complexes significantly, to 241 and 231 °C, respectively. The metal ions acted as the effective promoter and catalyst for the thermal polymerization of the Por-BZ monomer, and also improved the thermal stabilities after thermal polymerization.

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Section: Introductionmentioning

confidence: 99%

Metal Complexes of the Porphyrin-Functionalized Polybenzoxazine

et al. 2022

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“…Numerous papers, reviews and handbooks have also introduced their advanced and emerging applications in highfrequency communication, hard armor composites, fuel cells and radiation shielding. [3][4][5][6][7][8][9][10] Smart functions such as damage healability in polybenzoxazine based on hydrogen bonds, phenoxy exchange, ketene chemistry, boric ester, disulfide bonds and other dynamic structures have also been reported by Yagci and Kiskan et al, Verge et al and us. [11][12][13][14][15][16] The excellent molecular design flexibility of polybenzoxazine provides outstanding property adjustment capability.…”

Section: Introductionmentioning

confidence: 64%

The first observation of 3,1-benzoxazine polymerization for developing high performance thermosets

Zhang

Liang

et al. 2023

Polym. Chem.

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“…It will undergo a particular “absorption–reflection–reabsorption” process in the stacking samples. In addition, the EMI SE of the composite films per unit thickness (SE/ d ) in this work is compared with the other public literature studies. − As presented in Table and Figure i, at low silver loading, the films fabricated in this work exhibit outstanding SE/ d , which is ascribed to the combination of core–shell structured fillers and reasonable structure design.…”

Section: Resultsmentioning

confidence: 87%

Ag Nanoparticle-Coated Polystyrene Microspheres for Electromagnetic Interference Shielding Films with Low Metal Content

Cheng

Liu

Wang

et al. 2022

ACS Appl. Nano Mater.

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The fabrication of thin composite films incorporating metal-based fillers with a delicate structure to achieve high electromagnetic interference shielding effectiveness (EMI SE) at low metal content remains a great challenge. In this work, benefiting from the excellent electrical conductivity of Ag nanoparticles, Ag nanoparticle-coated polystyrene (PS@Ag) microspheres with a large PS core were selected as electrically conductive fillers, and the volume exclusion effect guaranteed the construction of an electrically conductive network with low silver loading. A spontaneous process to construct a segregated laminar structure with a three-dimensional electrically conductive network happened with the assistance of a gravity-driven effect. The flexible thin films with a low amount of silver exhibited outstanding EMI SE per unit thickness (SE/d). To further investigate the effect of the structure on the EMI SE efficiency, it is found that the alternate interfaces play a critical role in enhancing shielding performance by stacking multiple films compared to the bulk films obtained by casting. The EMI SE for an only 0.3 mm triple-piece stacking film with 6.3 wt % Ag loading could reach 55.3 dB compared to 37.2 dB for the triple-thickness casting film. Using the stacking process results in easy accessibility for tailored composites with the desired EMI SE, which supplies a new strategy for the design of shielding materials in the next-generation electronics.

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Absorption-enhanced EMI shielding using silver decorated three-dimensional porous architected reduced graphene oxide in polybenzoxazine composites

Abstract: The proliferation of wearable and portable electronic media increases the demand for developing highly efficient shielding materials to address the issue of electromagnetic interferences. This paper reports the development of...

Cited by 13 publications

References 40 publications

Metal Complexes of the Porphyrin-Functionalized Polybenzoxazine

Metal Complexes of the Porphyrin-Functionalized Polybenzoxazine

The first observation of 3,1-benzoxazine polymerization for developing high performance thermosets

Ag Nanoparticle-Coated Polystyrene Microspheres for Electromagnetic Interference Shielding Films with Low Metal Content

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