Thermal and viscoelastic behaviour of graphene nanoplatelets/flax fibre/epoxy composites

Kamaraj, M.; Dodson, E. Anush; Datta, Someswar

doi:10.1080/14658011.2020.1871241

Cited by 17 publications

(8 citation statements)

References 22 publications

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“…46 High damping properties of HCFC also indicate good interfacial characteristics, considering the fact of improved MWCNT/epoxy interaction due to the IL. 47 A decrease in glass transition temperature was observed with the addition of IL-modified MWCNT especially at higher IL content. This trend was the opposite of what is usually reported when nanofillers are added, 48 and perhaps is due to a decrease in surface tension of epoxy with IL, allowing the polymer to flow more easily and keeping a more plasticized state.…”

Section: Resultsmentioning

confidence: 92%

Thermomechanical properties of imidazolium ionic liquid-modified mwcnt/carbon fiber/epoxy hybrid composite laminates

Ghafoor

Farooq

Schrekker

et al. 2023

Journal of Composite Materials

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Hybrid composite laminates with nanofillers are high performance materials for thermal and structural applications. In this work, multiwall carbon nanotubes (MWCNT) were non-covalently modified by treating them with 1 wt% or 5 wt% of ionic liquid (IL), 1-butyl-3-methylimidazolium chloride. The treated MWCNT were dispersed in epoxy resin (weight content: 0.2–2 wt% or 1 to 3 wt%, respectively) and used to obtain hybrid composite laminates based on carbon fibers (CF) molded by hand layup and vacuum bagging techniques. The hybrid composite laminate containing 1 wt% of MWCNT modified with 1 wt% of IL showed the best mechanical and thermomechanical properties, including an increase of 210% and 151% in flexural strength and modulus, and an increase of 101%, 116% and 29.3% in storage modulus, loss modulus and damping, respectively. Scanning and transmission electron micrographs showed the enhanced MWCNT dispersion and network at low IL content, justifying its improved mechanical properties. The application of a low amount of IL dispersant was found a promising approach to prepare MWCNT/CF/epoxy composites with enhanced properties.

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Section: Resultsmentioning

confidence: 92%

Thermomechanical properties of imidazolium ionic liquid-modified mwcnt/carbon fiber/epoxy hybrid composite laminates

Ghafoor

Farooq

Schrekker

et al. 2023

Journal of Composite Materials

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“…The sample shape, conforming to ASTM standards D 7028-07, is illustrated in figure 4(c). Sample temperatures were varied from 300 K to 423 K at a rate of 5 K min −1 with a 1 Hz frequency load [36]. The analysis focused on determining the storage modulus, tanδ, and loss modulus, crucial for predicting the glass transition temperature (T g ) of the samples and comprehending the dynamic flexural behavior within the glass transition region of the neat epoxy SMP and epoxy/MWCNT SMNCs.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Analysing the shape memory behaviour of MWCNT-enhanced nanocomposites: a comparative study between experimental and finite element analysis

Gupta,

Mittal,

Kumar

et al. 2024

Funct. Compos. Struct.

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Shape memory polymers (SMPs) are known for their unique ability to withstand large deformations and revert to their original shape under specific external stimuli. However, their broader application in biomedical and structural applications is restricted by limited mechanical and thermal properties. Introducing multi-walled carbon nanotubes (MWCNTs) into SMPs has proven to significantly enhance these characteristics without affecting their inherent shape memory features. This study investigates shape memory nanocomposites (SMNCs) through dynamic and thermogravimetric analyses, along with tensile, flexural, and shape memory testing, and explores fracture interfaces using scanning electron microscopy. Findings indicate optimal shape memory, thermal, and mechanical properties with 0.6 wt% MWCNT content, showcasing a shape recovery ratio of 93.11%, storage modulus of 4127.63 MPa, tensile strength of 55 MPa, and flexural strength of 107.94 MPa. Moreover, incorporating MWCNTs into epoxy demonstrated a reduction in recovery times by up to 50% at 0.6 wt% concentration. Despite a slight decrease in shape fixity ratio from 98.77% to 92.11%, shape recoverability remained nearly consistent across all samples. The study also introduces a novel finite element (FE) method in ABAQUS for modeling the thermomechanical behaviour of SMNCs, incorporating viscoelasticity, validated by matching experimental results with FE simulations, highlighting its accuracy and practical applicability in engineering.

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“…Epoxy resins, which have two or more epoxide groups (‐C‐O‐C‐) per monomer, are widely utilized in aerospace, automotive, defense and electronic industries. However, their brittleness and low thermal conductivity (TC) limit their wide range of applications in several industries 15,16 . In order to eliminate this situation, polymer nanocomposites can be produced by adding nanomaterials such as electrically conductive graphene or silver nanoparticles and ceramic nanomaterials with high thermal conductivity such as boron nitride (BN) in epoxy resins at different rates.…”

Section: Introductionmentioning

confidence: 99%

“…However, their brittleness and low thermal conductivity (TC) limit their wide range of applications in several industries. 15,16 In order to eliminate this situation, polymer nanocomposites can be produced by adding nanomaterials such as electrically conductive graphene or silver nanoparticles and ceramic nanomaterials with high thermal conductivity such as boron nitride (BN) in epoxy resins at different rates. Graphene has attracted significant scientific attention since its discovery thanks to its unique mechanisms and excellent thermal, electrical, optical as well as mechanical properties [17][18][19][20] and is also one of the two dimensional nanofillers used in polymer nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Physical and mechanical properties of graphene and h‐Boron nitride reinforced hybrid aerospace grade epoxy nanocomposites

Öztürkmen,

Öz,

Dilsiz

2023

J of Applied Polymer Sci

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Varying graphene nanoplatelet (GNP) and hexagonal boron nitride (h‐BN) based fillers were integrated to an aerospace grade epoxy resin typically used as matrix to obtain or repair structural parts of aerospace platforms. The three‐roll milling approach was used for this purpose. Five cycles were performed for the mixing while the gap between rollers was 50 μm. Microstructure and thermal properties of the nanocomposites were studied. Moreover, mechanical and transport (electrical as well as thermal) performances were investigated. Results show that certain fillers yield multifunctional properties, that is, enhanced flexural strength by up to 69% in combination with high electrical conductivities with orders of magnitude of approximately and improved thermal conductivities up to 9.3%. For instance, the hybrid nanocomposite sample produced with 0.5 wt% GNP and 0.5 wt% h‐BN added to the epoxy matrix exhibits an electrical conductivity which increased fold, a flexural strength increased by 69% and thermal conductivity increased by 7% in comparison the neat epoxy. Hence, in this study it was demonstrated that these properties can be engineered and tuned effectively for aerospace applications like lightweight avionic chassis which have specific requirements like thermal and electric conductivity which naturally leads to the possible usage of GNP and h‐BN in an epoxy. Correspondingly, presented results are of relevance for novel thermal interface materials with tailored electrical properties.

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Thermal and viscoelastic behaviour of graphene nanoplatelets/flax fibre/epoxy composites

Cited by 17 publications

References 22 publications

Thermomechanical properties of imidazolium ionic liquid-modified mwcnt/carbon fiber/epoxy hybrid composite laminates

Thermomechanical properties of imidazolium ionic liquid-modified mwcnt/carbon fiber/epoxy hybrid composite laminates

Analysing the shape memory behaviour of MWCNT-enhanced nanocomposites: a comparative study between experimental and finite element analysis

Physical and mechanical properties of graphene and h‐Boron nitride reinforced hybrid aerospace grade epoxy nanocomposites

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