Enhanced thermal, mechanical and electromagnetic interference shielding properties of graphene nanoplatelets-reinforced poly(lactic acid)/poly(ethylene oxide) nanocomposites

Zeng, Qianqian; Du, Ziran; Qin, Chenyuan; Wang, Yaming; Liu, Chuntai; Shen, Changyu

doi:10.1016/j.mtcomm.2020.101632

Cited by 23 publications

(23 citation statements)

References 68 publications

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“…It takes no more than about 24 months to fully disintegrate PBAT into benign organic materials, and in the most optimal conditions, it could even be degraded in just 6 months. − Moreover, owing to its high flexibility and excellent processability, PBAT can be fabricated into nanofibers through electrospinning without much difficulty. However, biodegradable polymers often exhibit poor mechanical properties and inconsistent molecular weights and are difficult to synthesize into fibers (i.e., electrospinning), making them unsuitable for use as filter membranes for respiratory masks without modification. − Graphene, 2D materials (such as molybdenum disulfide nanoplatelets, graphene oxide nanoplatelets), carbon nanotubes, and nanoclays are strategic choices of material to enhance the mechanical characteristics of biodegradable polymers. Various nanofillers increase the binding force between biodegradable polymer chains and form a strong network structure to enhance mechanical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

et al. 2022

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The massive production of polymer-based respiratory masks during the COVID-19 pandemic has rekindled the issue of environmental pollution from nonrecyclable plastic waste. To mitigate this problem, conventional filters should be redesigned with improved filtration performance over the entire operational life while also being naturally degradable at the end. Herein, we developed a functional and biodegradable polymeric filter membrane consisting of a polybutylene adipate terephthalate (PBAT) matrix blended with cetyltrimethylammonium bromide (CTAB) and montmorillonite (MMT) clay, whose surface properties have been modified through cation exchange reactions for good miscibility with PBAT in an organic solvent. Particularly, the spontaneous evolution of a partial core–shell structure (i.e., PBAT core encased by CTAB-MMT shell) during the electrospinning process amplified the triboelectric effect as well as the antibacterial/antiviral activity that was not observed in naive PBAT. Unlike the conventional face mask filter that relies on the electrostatic adsorption mechanism, which deteriorates over time and/or due to external environmental factors, the PBAT@CTAB-MMT nanofiber membrane (NFM)-based filter continuously retains electrostatic charges on the surface due to the triboelectric effect of CTAB-MMT. As a result, the PBAT@CTAB-MMT NFM-based filter showed high filtration efficiencies (98.3%, PM0.3) even at a low differential pressure of 40 Pa or less over its lifetime. Altogether, we not only propose an effective and practical solution to improve the performance of filter membranes while minimizing their environmental footprint but also provide valuable insight into the synergetic functionalities of organic–inorganic hybrid materials for applications beyond filter membranes.

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Section: Introductionmentioning

confidence: 99%

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

et al. 2022

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“…These electrical conductivity variations were reflected in the EMI SE results. Generally, when incident EMI waves encounter shielding materials, the intensity of EM waves are reduced owing to reflection, absorption, and multiple reflections [33][34][35][36]. Therefore, EMI SE is defined by measuring the reduced effect of EM waves on the shielding materials.…”

Section: Electrical Conductivity and Electromagnetic Interference Shi...mentioning

confidence: 99%

“…In the case of the TGCF/CNT carbon papers carbonized at 700 °C, the EMI SE was 0 dB because their electrical conductivity was 0 S m −1 . At a carbonization temperature of 900 °C, EMI SE began to be observed owing Generally, when incident EMI waves encounter shielding materials, the intensity of EM waves are reduced owing to reflection, absorption, and multiple reflections [33][34][35][36]. Therefore, EMI SE is defined by measuring the reduced effect of EM waves on the shielding materials.…”

Section: Electrical Conductivity and Electromagnetic Interference Shi...mentioning

confidence: 99%

Carbon Papers from Tall Goldenrod Cellulose Fibers and Carbon Nanotubes for Application as Electromagnetic Interference Shielding Materials

et al. 2022

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To transform tall goldenrods, which are invasive alien plant that destroy the ecosystem of South Korea, into useful materials, cellulose fibers isolated from tall goldenrods are applied as EMI shielding materials in this study. The obtained cellulose fibers were blended with CNTs, which were used as additives, to improve the electrical conductivity. TGCF/CNT papers prepared using a facile paper manufacturing process with various weight percent ratios and thickness were carbonized at high temperatures and investigated as EMI shielding materials. The increase in the carbonization temperature, thickness, and CNT content enhanced the electrical conductivity and EMI SE of TGCF/CNT carbon papers. TGCF/CNT-15 papers, with approximately 4.5 mm of thickness, carbonized at 1300 °C exhibited the highest electrical conductivity of 6.35 S cm−1, indicating an EMI SE of approximately 62 dB at 1.6 GHz of the low frequency band. Additionally, the obtained TGCF/CNT carbon papers were flexible and could be bent and wound without breaking.

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“…In their study, they observed that the incorporation of GNPs enhanced drastically the EMI shielding effectiveness of the PLA/PEO blend matrix. Also, they reported that further addition of 1 wt% carbon nanotubes to PLA/PEO/6 wt% GNPs nanocomposites, the thermal, mechanical, electrical, and EMI SE of the materials enhanced markedly 1 . Poothanari et al 2 studied the EMI shielding effectiveness of polycarbonate/polypropylene (PC/PP)/MWCNT blend nanocomposites and they obtained an EMI shielding value of 54.78 dB for 2 mm thick shield sample at 10 wt% of MWCNT for compatibilized PC/PP/MWCNT nanocomposite.…”

Section: Introductionmentioning

confidence: 99%

Thin and efficient EMI shielding materials from binary thermoplastic blend nanocomposites

Kunjappan

Reghunadhan

Ramachandran

et al. 2022

Polymers for Advanced Techs

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EMI shielding materials and related research are of very relevance in this era of electronic gadgets. Here this report presents a binary thermoplastic blend nanocomposite system comprising poly‐(trimethylene terephthalate) and polyethene compatibilized with multiwalled carbon nanotubes, which are showing superior electromagnetic interference (EMI) shielding compared to similar systems. The blend composition with a 90/10 ratio of PTT/PE was showing the optimum properties when a MWCNT concentration of 1 wt% was incorporated. The compatibilization efficacy was analyzed and confirmed through scanning and tunneling electron microscopes. The MWCNTs are preferably localized in the PTT phase. The blend system provides an electrical percolation threshold of 0.19 wt% due to the double percolating effect of the blend system and MWCNT in the PTT phase. It was observed that the EMI shielding value shows a corresponding increase with MWCNT loadings. The most favorable value obtained for EMI shielding effectiveness was ~32 dB and it was with 3 wt% MWCNT of film thickness 2 mm in range of frequency 2–4 GHz. The PTT/PE/MWCNT system was not considered for EMI applications anywhere else. The theoretical support of the experimental data was examined for DC conductivity employing different models such as Voet, Bueche, and Scarisbrick and the actual contribution of reflection, absorption, transmission loss to the total EMI shielding was done with Power balance. The present work is a facile and cost‐effective method to fabricate lightweight and materials with high EMI shielding properties for mobile phones.

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Enhanced thermal, mechanical and electromagnetic interference shielding properties of graphene nanoplatelets-reinforced poly(lactic acid)/poly(ethylene oxide) nanocomposites

Cited by 23 publications

References 68 publications

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

Carbon Papers from Tall Goldenrod Cellulose Fibers and Carbon Nanotubes for Application as Electromagnetic Interference Shielding Materials

Thin and efficient EMI shielding materials from binary thermoplastic blend nanocomposites

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