Effects of mixed micro and nano silica particles on the dynamic compressive performances of epoxy adhesive

Yohanes, Yohanes; Sekiguchi, Y.

doi:10.1186/s40563-017-0083-y

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…In this case, silica and kenaf fibers seemed to be compatible with epoxy, resulting in good interfacial bonding between them, inhibiting the mobility of the molecular matrix at the interface. As a result, the stress transfer increased, followed by improved flexural strength and stiffness [18]. The homogeneous distribution of silica contributed to that mechanism.…”

Section: Resultsmentioning

confidence: 96%

Comparative Study of Epoxy Composites Reinforced with Kenaf Fiber and Different Types of Microparticles

Rozi

Budiyantoro

Hamdan

2022

KEM

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Reinforcement of both fibrous and particulate materials can improve composite properties for various applications, such as biomedical applications. The alkali-treated kenaf fibers and (SiO2, bentonite, and CaCO3) microparticles 400 mesh in size reinforce the epoxy matrix for hybrid composites. The bending and impact properties of hybrid composites, as well as their water absorption, are compared. The hybrid composites were prepared in a compression mold using a hand lay-up technique at 100°C for 20 – 50 minutes consisting of 28 vol.% of short kenaf fibers ~5 mm in length, 2 vol.% of each type of microparticle, and 70 vol.% the epoxy resin. The flexural and impact properties of kenaf/silica/epoxy composite indicated the highest flexural strength (58.37±3.9 MPa), flexural modulus (4.68 ± 0.17 MPa), and impact strength (7.49 kJ/m2). The addition of the microparticles reduced water absorption in the composites. The water absorption of kenaf/silica/epoxy composite appeared to be stable for immersion time near 216 hours. Other microparticle-filled composites did not show this pattern. The incorporation of silica microparticles to the kenaf/epoxy composite potentially enhanced the mechanical properties of the composite, with the expectation of using it to be developed for biomedical composite material.

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Section: Resultsmentioning

confidence: 96%

Comparative Study of Epoxy Composites Reinforced with Kenaf Fiber and Different Types of Microparticles

Rozi

Budiyantoro

Hamdan

2022

KEM

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“…In SHPB with sandwiched specimens [20], precise damping estimation is difficult owing to incomplete stress-strain responses, which are ascribed to poor bar-specimen contact during unloading. In the present work, epoxy/silica adhesive was bonded to both input and output bars to maintain bar-specimen contact and to generate closed-loop stress-strain responses.…”

Section: Methodsmentioning

confidence: 99%

“…More recently, in the authors' previous paper [20], we estimated the elastic-dynamic stiffness and damping of epoxy filled with silica micro-nanoparticles under a strain rate loading of 140 s −1 using SHPB with sandwiched specimens. We observed that epoxy filled with two-size silica particles exhibited greater damping, but lower stiffness compared to that of single silica particles.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

Yohanes

Sekiguchi

2018

J. dynamic behavior mater.

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Dynamic stiffness and damping of epoxy adhesives are critical for ensuring the safety, reliability, and comfort of structures subjected to vibrations and impact loads. This study conducts split Hopkinson pressure bar (SHPB) tests to investigate the synergistic effects of silica micro-nanoparticles on these critical properties. Micro-nanoparticle content and composition ratio purity are varied at 2, 5, and 10% by weight (wt%) and from 0% (pure microparticles) to 100% (pure nanoparticles), respectively. Positive simultaneous stiffening and energy absorption effects are observed at a silica content of 5 wt% owing to improved nanoparticle dispersion; this increases the interface area and induces cooperative matrix-filler interactions. At this silica content and a composition ratio of 50%, stiffness and damping are 45 and 40% larger than those of neat epoxy, respectively. Silica micro-nanoparticles are less effective in improving particle dispersion at more than 5 wt%. Conventional mechanical dispersion is limited to applications below a certain silica content; the results suggest a simple, low-cost dispersion technique as an alternative to the in-situ technique and provide options for designing epoxy stiffness and damping appropriate for specific applications.

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“…5 show that, adhesion strength increased by increasing NS content. This may be attributed to incorporation of silica nanoparticles in epoxy resulting in good adhesion with epoxy matrix [28]. Also, the reinforcing effect of nano particles of silica is mainly contributed in increasing the rigidity of EP-NS and consequently increasing the adhesion strength values [29,30].…”

Section: Fig 6 Adhesion Strength Of the Applied Coatingsmentioning

confidence: 99%

Influence of Silica Nanoparticles on the Properties of Nanocomposite Based on Epoxy as Concrete Protective Coating

Shohide

Ahmed

2023

MSF

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Concrete structure especially that exposed to aggressive environment is deteriorated leading to damage of concrete buildings. Concrete coating is one of the most effective methods used for concrete protection. In this work epoxy was modified with nanosilica (NS) with different loadings. Epoxy nanosilica (EP-NS) composite was formulated and used as concrete protective coating after evaluate its properties regarding drying time, dry film thickness (DFT), adhesion strength. The coated concretes ware tested as; water absorption, contact angle (hydrophobicity) and chloride diffusion resistance by ion exchange method. Although, durability of coated concretes were examined by determining change in weight and change in compressive strength after immersion in both sulfuric acid and sodium chloride solution separately. The study revealed that, the optimum NS content is 3 % by total weight of coating. The prepared EP-NS coatings have significant protection mechanism for enhancing concrete performance against the postulated aggressive attack. Keywords: protective coating, polymer nanocomposite coating

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Effects of mixed micro and nano silica particles on the dynamic compressive performances of epoxy adhesive

Cited by 12 publications

References 23 publications

Comparative Study of Epoxy Composites Reinforced with Kenaf Fiber and Different Types of Microparticles

Comparative Study of Epoxy Composites Reinforced with Kenaf Fiber and Different Types of Microparticles

Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

Influence of Silica Nanoparticles on the Properties of Nanocomposite Based on Epoxy as Concrete Protective Coating

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