Dielectric properties and electromagnetic interference shielding effectiveness of graphene-based biodegradable nanocomposites

Kashi, Sima; Gupta, Rahul; Baum, Thomas C.; Kao, Nhol; Bhattacharya, S. N.

doi:10.1016/j.matdes.2016.07.062

Cited by 127 publications

(78 citation statements)

References 68 publications

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“…However, for PLA70 and PLA100, this percentage is higher. The chemical structure of PBAT has benzene rings [72] that restrict PLA mobility and structural regularity, impeding the reorganization of PLA chains; thus, the percentage of crystallinity is reduced as PBAT content is increased in the blends. Moreover, the cold crystallization peak is larger for the blends than for PLA100, as can be seen for PLA70 as compared to PLA in Figure 4b [73].…”

Section: Compoundmentioning

confidence: 99%

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

et al. 2019

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Nowadays, the need to reduce the dependence on fuel products and to achieve a sustainable development is of special importance due to environmental concerns. Therefore, new alternatives must be sought. In this work, extruded fibers from poly (lactic acid) (PLA) and poly (butylene adipate-co-terephthalate) (PBAT) added with cinnamon essential oil (CEO) were prepared and characterized, and the hydrolytic degradation was assessed. A two-phase system was observed with spherical particles of PBAT embedded in the PLA matrix. The thermal analysis showed partial miscibility between PLA and PBAT. Mechanically, Young’s modulus decreased and the elongation at break increased with the incorporation of PBAT and CEO into the blends. The variation in weight loss for the fibers was below 5% during the period of hydrolytic degradation studied with the most important changes at 37 °C and pH 8.50. From microscopy, the formation of cracks in the fiber surface was evidenced, especially for PLA fibers in alkaline medium at 37 °C. This study shows the importance of the variables that influence the performance of polyester-cinnamon essential oil-based fibers in agro-industrial applications for horticultural product preservation.

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Section: Compoundmentioning

confidence: 99%

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

et al. 2019

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“…The permittivity values exhibit a moderate decreasing trend over the frequency. The decreasing trend of permittivity with increasing frequency can be attributed to the variation of polarization with frequency [12]. On the other hand, Fig.…”

Section: Methodsmentioning

confidence: 88%

Electromagnetic Wave Absorption Properties of Novel Green Composites Coconut Fiber Coir and Charcoal Powder over X-band Frequency for Electromagnetic Wave Absorbing Applications

Yah

Rahim

Lee

et al. 2018

AEM

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This paper presents the electromagnetic wave (EW) absorption properties in terms of complex permittivity and permeability of novel green composites coconut fiber coir and charcoal powder materials. The samples were fabricated using the raw agricultural waste coconut fiber coir, charcoal powder, epoxy resin and hardener with varied composition. The dielectric properties of the materials were characterized using two-port waveguide measurement method over the X-band frequency (8.2 -12.4GHz). The average permittivity value measured is approximately 3.00 with 10wt% charcoal has the highest permittivity of 3.59. Apart from that, all samples exhibit good reflection loss of better than -25dB which means more than 99% absorption rate. The result shows the composite material is a promising organic material for electromagnetic absorber applications.

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“…Polyethylene glycol (PEG) usually acts as a typical plasticizer in modified polymer materials. Other references have suggested that PEG can be adopted as plasticizer within the PLA/GO composite to enhance dispersion of GO and toughness of the composite . Ahmad et al investigated that a nanocomposite of PLA/RGO/PEG was produced via melt blending; the flexibility and thermal stability of PLA‐based composite were improved by PEG as plasticizer and RGO as reinforcing and nucleating agent.…”

Section: Introductionmentioning

confidence: 99%

“…Other references have suggested that PEG can be adopted as plasticizer within the PLA/GO composite to enhance dispersion of GO and toughness of the composite. [28][29][30][31] Ahmad et al 30 investigated that a nanocomposite of PLA/RGO/PEG was produced via melt blending; the flexibility and thermal stability of PLA-based composite were improved by PEG as plasticizer and RGO as reinforcing and nucleating agent. A proposal for "freezingdried graphene/PEG masterbatch" was performed, and the results demonstrated that the masterbatch promoted the crystallization rate and dielectric properties of PLA-based composite.…”

Section: Introductionmentioning

confidence: 99%

A feasible strategy to constructing hybrid conductive networks in PLA‐based composites modified by CNT‐d‐RGO particles and PEG for mechanical and electrical properties

Jia

Zhu

et al. 2019

Polymers for Advanced Techs

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Carbon nanotubes (CNTs) and reduced graphene oxide (RGO) were successfully assembled by chemical reaction to obtain CNT‐d‐RGO particles. Then, a home‐made dynamic impregnating device was used to prepare hybrid CNT‐d‐RGO/polyethylene glycol (PEG). Next, the different modifiers, including CNTs, GO, CNT‐d‐RGO, PEG, and CNT‐d‐RGO/PEG, were, respectively, added into poly‐(lactic acid) (PLA) matrix via melt‐compounding. The dispersed morphology for these different modifiers within the PLA matrix was confirmed by SEM and TEM observations. Especially, compared with the identical weight ratio of CNT‐d‐RGO, the hybrid CNT‐d‐RGO/PEG within the PLA matrix exhibited an excellent exfoliated and interconnected networks morphology. Moreover, compared with pure PLA, not only the crystallinity of all PLA‐based composites notably improved, but half‐crystallization time was also shortened. Furthermore, despite the addition of different modifiers, the crystal form of PLA‐based composites remained unchanged. Noticeably, compared with those of pure PLA, the tensile stress, strain, and modulus of PLA composite added with CNT‐d‐RGO/PEG increased by 29.4%, 4.1%, and 56.1%, respectively, and the V‐notch impact strength slightly improved. In addition, compared with pure PLA, volume resistivity of the PLA composite added with 1 wt% CNT‐d‐RGO/PEG decreased by 93.1%, and its volume conductivity increased by five orders of magnitude.

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Dielectric properties and electromagnetic interference shielding effectiveness of graphene-based biodegradable nanocomposites

Cited by 127 publications

References 68 publications

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

Electromagnetic Wave Absorption Properties of Novel Green Composites Coconut Fiber Coir and Charcoal Powder over X-band Frequency for Electromagnetic Wave Absorbing Applications

A feasible strategy to constructing hybrid conductive networks in PLA‐based composites modified by CNT‐d‐RGO particles and PEG for mechanical and electrical properties

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