Mechanical Properties of MWCNT Reinforced Epoxy Nanocomposites: Experimental, Micromechanical and Numerical Study

Bhowmik, Krishnendu; Basantia, Saroj Kumar; Roy, Tarapada; Bandyopadhyay, Abhijit; Khutia, Niloy; Chowdhury, Amit Roy

doi:10.1007/s40033-022-00358-6

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…Lignin is a bulky biopolymer and despite its sub‐micro sized particles and increased functionality towards epoxy ring opening, it cannot be effectively incorporated and dispersed within the bulk epoxy polymer phase without disturbing the ordering of the dense crosslinked epoxy chain network, thus resulting in inferior mechanical properties at high loadings. Still, the identified achievable level of OBs organosolv lignin addition (either as curing agent partial replacement or as additive) at about 6−9 wt %, surpass those of other classical inorganic or organic nanofillers without any prior functionalization, such as clays, carbon nanotubes, graphene and nanocellulose [82,89–92] …”

Section: Organosolv Lignin‐epoxy Compositesmentioning

confidence: 97%

“…Still, the identified achievable level of OBs organosolv lignin addition (either as curing agent partial replacement or as additive) at about 6 À 9 wt %, surpass those of other classical inorganic or organic nanofillers without any prior functionalization, such as clays, carbon nanotubes, graphene and nanocellulose. [82,[89][90][91][92] The epoxy-lignin composites were also tested by DMA to investigate their thermomechanical properties. The data in Table 4 summarize the storage modulus values for the pristine polymer at 30 °C (glassy region, below T g ) and at 130 °C (rubbery region, above T g ), along with the T g values obtained from the maximum in tan δ (DMA) and DSC analysis.…”

Section: Chemsuschemmentioning

confidence: 99%

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Sub‐Micro Organosolv Lignin as Bio‐Based Epoxy Polymer Component: A Sustainable Curing Agent and Additive

2023

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Sub‐micro organosolv lignin (OBs) isolated from beechwood biomass, comprising of sub‐micro sized particles (570 nm) with low molecular weight and dispersity and relatively high total phenolic −OH content, is utilized for the production of bio‐based epoxy polymer composites. OBs lignin is incorporated into the glassy epoxy system based on diglycidyl ether of bisphenol A (DGEBA) and aliphatic polyoxypropylene α,ω‐diamine (Jeffamine D‐230), being utilized both as a curing agent, partially replacing D‐230, and as an additive, substituting part of both petroleum‐derived components. Up to 12 wt % replacement of D‐230 by OBs lignin is achieved, whereas approximately 17 wt % of OBs effectively replaces the conventional epoxy polymer. The incorporation of OBs lignin in the polymeric matrix is achieved without the use of any solvent or previous functionalization. Enhanced properties are obtained, with substantial increases in tensile strength, strain, stiffness, glass transition temperature, antioxidant activity, and resistance to solvents.

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Section: Organosolv Lignin‐epoxy Compositesmentioning

confidence: 97%

Section: Chemsuschemmentioning

confidence: 99%

Sub‐Micro Organosolv Lignin as Bio‐Based Epoxy Polymer Component: A Sustainable Curing Agent and Additive

2023

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“…The mechanical characteristics of the polymer matrix are detailed in table 1, in terms of engineering constants E m and ν m obtained from [32]. Additionally, the elastic properties of MWCNTs are presented in terms of Hill's elastic moduli derived from [33][34][35]. The bulk modulus (K m ) and shear modulus (G m ) of the isotropic matrix can be calculated as follows,…”

Section: Micromechanical Model Of Epoxy/mwcnt Smncsmentioning

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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Evaluation of Elastic Properties of CNT/GNP/Epoxy Hybrid Nanocomposite for Different Weight Fractions of CNT and GNP

Choudhury,

Saikia,

Saikia

et al. 2023

J. Inst. Eng. India Ser. D

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Mechanical Properties of MWCNT Reinforced Epoxy Nanocomposites: Experimental, Micromechanical and Numerical Study

Cited by 5 publications

References 26 publications

Sub‐Micro Organosolv Lignin as Bio‐Based Epoxy Polymer Component: A Sustainable Curing Agent and Additive

Sub‐Micro Organosolv Lignin as Bio‐Based Epoxy Polymer Component: A Sustainable Curing Agent and Additive

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

Evaluation of Elastic Properties of CNT/GNP/Epoxy Hybrid Nanocomposite for Different Weight Fractions of CNT and GNP

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