Graphene-like nanocarbon: An effective nanofiller for improving the mechanical and thermal properties of polymer at low weight fractions

Kumar, Arvind; Chouhan, Devesh Kumar; Alegaonkar, P.S.; Patro, T. Umasankar

doi:10.1016/j.compscitech.2016.02.028

Cited by 37 publications

(14 citation statements)

References 35 publications

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“…As seen in previous studies, this phenomenon can be attributed to filler agglomeration, and consequent reduction of effective interaction between the filler and the polymer matrix, leading to an inefficient stress transfer from matrix to filler [41,43,44]. Gas permeation measurements were carried out to evaluate the physical aging in pristine PIM-1 membranes and MMMs up to 155 days, with permeability data for days 0 (fresh membranes right after preparation and methanol treatment), 35, 63, 92, 128 and 155.…”

Section: Resultsmentioning

confidence: 64%

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Alberto

Bhavsar

Luque-Alled

et al. 2018

Journal of Membrane Science

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Physical aging of polymer of intrinsic microporosity PIM-1 is one of the major obstacles for its application as a commercial membrane material for gas separation. In this work, physical aging of PIM-1 and matrices of this same polymer containing graphene-like materials were studied.Graphene-like fillers resulted from the functionalization of graphene oxide (GO) with two alkyl chains of different lengths, using octylamine (OA) and octadecylamine (ODA), and further chemical reduction. Extents of membrane aging were evaluated through changes in gas permeability over time;the separation of gas mixtures comprising carbon dioxide and methane, which are of great interest for industrial applications such as the production of biogas or the purification of natural gas, was carried out. 50:50 vol. % CO 2 /CH 4 mixtures were used as feed and separation performance analysed for fresh membranes and at intervals of approximately a month up to 155 days. At the end of this testing period, aged PIM-1 membranes showed a CO 2 permeability of (2.0± 0.7) x 10 3 Barrer, which corresponds to a CO 2 permeability reduction of 68 % from the value obtained right after their fabrication. The addition of alkyl-functionalized GO is shown to be an efficient strategy to retard the physical aging of PIM-1 membranes; filler loadings as low as 0.05 wt.% of reduced octylfunctionalized GO showed a CO 2 permeability of (3.5 ± 0.6) x 10 3 Barrer after 5 months, which is almost three quarters higher than that of pure PIM-1 membrane aged for the same time period and represents a reduction of just 39% from its initial value. Moreover, the addition of graphene-like materials to PIM-1 does not affect its mechanical properties. Highlights Physical aging of mixed matrix membranes (MMMs) composed of PIM-1 and graphene-like materials was investigated. A binary CO 2 /CH 4 (50:50 vol.%) gas mixtures was used. Physical aging was reduced by the incorporation of reduced alkyl-functionalized graphene oxide nanosheets into PIM-1 matrices. Low filler loadings led to higher reduction in physical aging.

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Section: Resultsmentioning

confidence: 64%

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Alberto

Bhavsar

Luque-Alled

et al. 2018

Journal of Membrane Science

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“…Recently, strain sensors-based on the use of electrically conductive polymer composites have attracted great interest due to their light weight, flexibility, easy processing, and cost effectiveness [8]. In particular, the development of new carbon-based conductive nanofillers is fueling the research of graphene-based polymer composites showing a favorable combination of electrical properties with typical features of polymeric materials, such as lightness and easy workability [9][10][11]. Among the most interesting properties of these materials, the electro-mechanical ones stand out, as they allow the development of innovative sensors, overcoming the limitations of traditional materials [12].…”

Section: Introductionmentioning

confidence: 99%

Waterproof Graphene-PVDF Wearable Strain Sensors for Movement Detection in Smart Gloves

Bidsorkhi

D’Aloia

Bellis

et al. 2021

Sensors

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In this work, new highly sensitive graphene-based flexible strain sensors are produced. In particular, polyvinylidene fluoride (PVDF) nanocomposite films filled with different amounts of graphene nanoplatelets (GNPs) are produced and their application as wearable sensors for strain and movement detection is assessed. The produced nanocomposite films are morphologically characterized and their waterproofness, electrical and mechanical properties are measured. Furthermore, their electromechanical features are investigated, under both stationary and dynamic conditions. In particular, the strain sensors show a consistent and reproducible response to the applied deformation and a Gauge factor around 30 is measured for the 1% wt loaded PVDF/GNP nanocomposite film when a deformation of 1.5% is applied. The produced specimens are then integrated in commercial gloves, in order to realize sensorized gloves able to detect even small proximal interphalangeal joint movements of the index finger.

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“…where EPCΓ 2 is the hypothetical Γ-phonon-branching parameter (47 (eV/Å) 2 ), a o is 3.14 Å, and µ, is the reduced mass of the carbon molecule. The value of V F for GLNR and HSR GLNR was, respectively, ≈1 × 10 6 and 5 × 10 5 ms −1 [22][23][24].…”

Section: I D I Gmentioning

confidence: 90%

Surface Interactions of Transonic Shock Waves with Graphene-Like Nanoribbons

et al. 2020

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Graphene-like nanoribbons (GLNRs) were fabricated (length—20 μm; width—2 μm) and subjected to blast-like pulsed pressure >1.5 GPa (pulse speed ≈1 Mach, impulse duration, ≈µs) to examine the amount of absorption. GLNRs prepared by the chemical vapor deposition technique via controlled biomass combustion were subjected to investigate the structure–property characteristics using microspectroscopic techniques. Following this, GLNRs were employed to high strain rate (HSR) studies with the help of the technique known as split Hopkinson pressure bar (SHPB) to evaluate numerous dynamic parameters. The parameters were extracted from variations in the stress and strain rates. Their analysis provided insight into the damping response of blast energy within GLNRs. By and large, the impact generated modified the microstructure, exhibiting modifications in the number of layers, conjugated loops, and dynamic disorder. Signal processing analysis carried out for incident and transmitted impulse pressure revealed an interaction mechanism of shock wave with GLNR. Details are presented.

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Graphene-like nanocarbon: An effective nanofiller for improving the mechanical and thermal properties of polymer at low weight fractions

Cited by 37 publications

References 35 publications

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Waterproof Graphene-PVDF Wearable Strain Sensors for Movement Detection in Smart Gloves

Surface Interactions of Transonic Shock Waves with Graphene-Like Nanoribbons

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