Compressive behaviour of nanoclay modified aerospace grade epoxy polymer

Jumahat, Aidah; Soutis, C.; Jones, Frank R.; Hodzic, A.

doi:10.1179/1743289811y.0000000028

Cited by 35 publications

(10 citation statements)

References 24 publications

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“…(The fracture toughness values were determined from the area under the stress-strain curves. 61 ) The toughness for DX MG1/CNT showed a linear relationship with C CNT (Fig. 7e).…”

Section: Mechanical Properties Of Sx Mg/cnt and DX Mg/cnt Hydrogel Comentioning

confidence: 86%

A study of conductive hydrogel composites of pH-responsive microgels and carbon nanotubes

et al. 2016

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Conductive gel composites are attracting considerable attention because of their interesting electrical and mechanical properties. Here, we report conductive gel composites constructed using only colloidal particles as building blocks. The composites were prepared from mixed dispersions of vinyl-functionalised pH-responsive microgel particles (MGs) and multi-walled carbon nanotubes (CNTs). MGs are crosslinked pH-responsive polymer colloid particles that swell when the pH approaches the pKa of the particles. Two MG systems were used which contained ethyl acrylate (EA) or methyl acrylate (MA) and around 30 mol% of methacrylic acid (MAA). The MA-based MG is a new pH-responsive system. The mixed MG/CNT dispersions formed thixotropic physical gels. Those gels were transformed into covalent interlinked electrically conducting doubly crosslinked microgel/CNT composites (DX MG/CNT) by free-radical reaction. The MGs provided the dual roles of dispersant for the CNTs and macro-crosslinker for the composite. TEM data showed evidence for strong attraction between the MG and the CNTs which facilitated CNT dispersion. An SEM study confirmed CNT dispersion throughout the composites. The mechanical properties of the composites were studied using dynamic rheology and uniaxial compression measurements. Surprisingly, both the ductility and the modulus of the gel composites increased with increasing CNT concentration used for their preparation. Human adipose-derived mesenchymal stem cells (AD-MSCs) exposed to DX MG/CNT maintained over 99% viability with metabolic activity retained over 7 days, which indicated non-cytotoxicity. The results of this study suggest that our approach could be used to prepare other DX MG/CNT gel composites and that these materials may lead to future injectable gels for advanced soft-tissue repair.

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“…(The fracture toughness values were determined from the area under the stress-strain curves. 61 ) The toughness for DX MG1/CNT showed a linear relationship with C CNT (Fig. 7e).…”

Section: Mechanical Properties Of Sx Mg/cnt and DX Mg/cnt Hydrogel Comentioning

confidence: 86%

A study of conductive hydrogel composites of pH-responsive microgels and carbon nanotubes

et al. 2016

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“…[19] For example, the compression properties of epoxy-MMT nanoclay can be predicted using a modified Halpin-Tsai mathematical model suitable for nano-scale reinforcement. [20] In spite of several literatures reported earlier, very few works report the compressive properties of nanoparticle reinforced polymer composites. Moreover, to the author's best of knowledge no work was reported on the compressive behavior of nano-sized MMT clay reinforced in unsaturated polyester (UP) resin matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Experimentation, optimization, and predictive analysis of compressive behavior of montmorillonite nano‐clay/unsaturated polyester composites

et al. 2022

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The effect of montmorillonite (MMT) nano-clay as reinforcement in unsaturated polyester resin (UP) matrix composite was investigated under compression loading to explore the impact of MMT nano-clay wt% in the compressive behavior of UP-MMT nano-clay composite. UP-MMT nano-clay composite samples were prepared with a varied filler content of 0.5 to 3 wt% using dualmixing methods, which are mechanical stirring and ultrasonic agitation.Static uniaxial compression tests were conducted using cylindrical-shaped samples to obtain the compressive behavior of the UP-MMT nano-clay composites. The results of experimentation record a considerable improvement in compressive characteristics of UP-MMT nano-clay composites compared to pure UP matrix. The UP-MMT nano-clay composite samples were viewed under transmission electron microscope (TEM) to know the dispersion of MMT nano-clay in the composites. The nano-platelets were well dispersed and intercalated in the UP-MMT nano-clay composite samples below 1 wt% MMT nano-clay loading. The optimum wt% of MMT nano-clay in the UP-MMT nano-clay composite for improved compressive stress at yield and modulus were noted as 0.60 and 0.61 wt% respectively. Moreover, a mathematical model using Halpin-Tsai-Jumahat equations was utilized to predict the compressive properties of UP-MMT nano-clay composites, which are in closer agreement with the experimental results.

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“…Furthermore, under service conditions, the durability of epoxy/montmorillonite clay composites depends on the mechanical and tribological properties of the montmorillonite clay fillers (Chen et al, 2014) in epoxy composites coatings. Clay fillers have been used due to their high availability and good thermal stability, in addition to the improved mechanical and fillers properties of their composites (Jumahat et al, 2013) and (Jumahat et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Epoxy/Clay Composite Coatings on an X65 Steel Substrate

et al. 2021

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This paper presents the results of a combined experimental and theoretical study of the interfacial and mechanical properties of epoxy/clay composites coatings on a mild steel substrate. This was studied using nano-indentation and Brazil Disk techniques to determine the Young's moduli, hardness values and mode mixity characteristics of the composite coatings. The Young's moduli of the reinforced composites comprising 1, 3, and 5 wt. % of montmorillonite clay particles are shown to improve, respectively, by about 23%, 58%, and 50% while the respective hardness values increased by about 46%, 80%, and 88%, relative to those of pristine epoxy. The measured mechanical properties have also shown to compare favorably with predictions from composite theories (rule-of-mixture and shear lag theories). The interfacial toughness between X65 steel and the epoxy/clay coatings increases with increasing mode mixity. This is associated with crack-tip shielding by crack deflection and crack bridging. The trends in the measured mode-mixity dependence of the interfacial fracture toughness values are consistent with predictions from the simplified zone, normal zone, and row models (at lower mode mixity). The insights from the observations and the measured crack profiles are incorporated into zone and row models for the estimation of crack-tip shielding. The implications of the ABOUT THE AUTHOR Ngasoh Fayen Odette obtained a Bachelor degree in Chemistry and Materials Science from the University of Buea, Cameroon in 2010. She also received her M.Sc in Materials Science and Engineering from the African University of Science and Technology (AUST) in Abuja, Nigeria in 2013. She is actively involved in the research and design of composites using promising materials locally source. She also extensively evaluates the adhesion of such coatings to substrates using fracture mechanic approach such as the interfacial fracture studies, for better understanding of their underlying properties. She is certain that findings from her work will benefit a wide range of research.

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Compressive behaviour of nanoclay modified aerospace grade epoxy polymer

Cited by 35 publications

References 24 publications

A study of conductive hydrogel composites of pH-responsive microgels and carbon nanotubes

A study of conductive hydrogel composites of pH-responsive microgels and carbon nanotubes

Experimentation, optimization, and predictive analysis of compressive behavior of montmorillonite nano‐clay/unsaturated polyester composites

Mechanical Properties of Epoxy/Clay Composite Coatings on an X65 Steel Substrate

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