Effect of shape and size of nanofillers on the viscoelasticity of polymer nanocomposites

Luo, Dandan; Wu, Haoyu; Li, Haoxiang; Zhang, Wenfeng; Zhang, Liqun; Gao, Yangyang

doi:10.1016/j.polymer.2022.124750

Cited by 8 publications

(4 citation statements)

References 48 publications

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“…In the current study, nanosilica (∼175–225 m 2 /g) and GO (∼2590 m 2 /g) are used. According to the previous reports, GO has more surface area and hence a high contact area with the polymer chains; consequently, more chains will be immobilized . As mentioned earlier, the higher d -spacing of the GO sheets in GSH further immobilizes more chain on them.…”

Section: Resultsmentioning

confidence: 77%

Insights into the Synergistic Effect of Graphene Oxide/Silica Hybrid Nanofiller for Advancing the Properties of Epoxy Resin

George,

Vijayan P,

Ponçot

et al. 2024

ACS Appl. Polym. Mater.

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Tuning the interfacial interaction between the filler and the matrix is essential to fabricate high-performance polymer nanocomposites. Herein, a hybrid nanofiller based on graphene oxide (GO) and nanosilica (SiO2) was prepared via electrostatic charge attraction. Amine-functionalized nanosilica was decorated over the surface of the GO sheet via simple aqueous mixing. The hybrid nanofiller approach of GO with nanosilica reduces the cohesive force between the GO sheets, facilitating better dispersion and thereby enhancing the properties of epoxies (preventing GO–GO and silica–silica agglomeration). The high-resolution transmission electron microscopy showed that the d spacing between GO sheets in the GO-SiO2 hybrid nanofiller (0.32 ± 0.70 nm) was higher than that in pristine GO. The synergistic effect of GO and nanosilica in the GO-SiO2 hybrid nanofiller of varying content (0.25 to 0.75 phr) as a reinforcement for advancing the properties of epoxies was monitored systematically. The effect of the GO-SiO2 hybrid nanofiller on the chain confinement, structure, and mechanics was studied by dynamic mechanical analysis. It was found that the hybrid nanofiller incorporation improved the filler matrix interaction and, thereby, the mechanical properties and glass transition temperature (T g) of epoxy. Epoxy chains near the vicinity of the hybrid filler have become immobilized because of the strong filler-matrix interaction and form a confined zone around the filler-matrix interface. The quantitative measurement of the immobilized epoxy chains formed by the hybrid nanofiller was determined from the tan delta curve. A maximum enhancement in the storage modulus, T g, impact strength, and other theoretical parameters was observed for epoxy nanocomposite with 0.5 phr loading of the hybrid nanofiller.

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Section: Resultsmentioning

confidence: 77%

Insights into the Synergistic Effect of Graphene Oxide/Silica Hybrid Nanofiller for Advancing the Properties of Epoxy Resin

George,

Vijayan P,

Ponçot

et al. 2024

ACS Appl. Polym. Mater.

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“…5 (h)–5(j) correspond to the diagrams of energy storage modulus (E′), loss modulus (E″), and loss factor (E″/E′) obtained from the DMA tests of sSiO 2 /PTFE and mSiO 2 /PTFE composites. A higher E′ indicates a stronger rigidity of the system [ 28 , 29 ], while a higher E″ represents a stronger obstruction to the motion of the polymer molecular chains in the system, resulting in a larger energy loss in the motion of the polymer molecular chains [ 30 , 31 ]. As can be seen from Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the dielectric and thermal properties of polytetrafluoroethylene-based composites through designing and constructing a novel interfacial structure

Li,

Shen,

Zhou

et al. 2024

Heliyon

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“…FTIR and TGA analyzes revealed no chemical interactions among S40, S30, and W. The rheological investigation was mainly based on physical interactions that were governed by the morphology and interface. Therefore, a comprehensive investigation of filler aggregation dynamics and its structural breakdown was conducted to explore the interaction between SBS and W under a fixed shear strain, followed by the storage modulus or strain amplitude (Payne effect) 21–24 . All composites exhibited the Payne effect, although the W content had a marked influence on it, as summarized in Figure 6.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, a comprehensive investigation of filler aggregation dynamics and its structural breakdown was conducted to explore the interaction between SBS and W under a fixed shear strain, followed by the storage modulus or strain amplitude (Payne effect). [21][22][23][24] All composites exhibited the Payne effect, although the W content had a marked influence on it, as summarized in Figure 6. S40-W showed a structural breakdown with a much lower strain than that observed for S30-W composites.…”

Section: X-ray Transmission Post-irradiation Thermal Management and F...mentioning

confidence: 91%

Stress relaxation and thermal management in highly filled flexible styrene butadiene styrene copolymer‐tungsten composites for high‐energy radiation attenuation

et al. 2023

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A high loading of high‐density and high‐atomic‐number fillers are necessary to obtain desirable X‐ray attenuation characteristics from radiation shields. However, at high filler loadings, the mechanical and viscoelastic properties of polymers are severely impaired, posing a long‐term threat to the mechanical integrity and radiation protection, and the radiation shield temperature may increase after prolonged exposure to ionizing radiation, accelerating the aging of the polymer matrix. In addition, inadequate thermal conduction can make the user uncomfortable while using radiation shields for personal protection. Unfortunately, little attention has been paid to the viscoelastic, stress relaxation, and thermal conductivity‐related features of these densely loaded systems, despite the significant effect of these parameters on long‐term applications and user compliance. In the present work, two different styrene butadiene styrene (SBS) copolymers were used to develop SBS‐tungsten (W) composites. At 500 phr W loading, significant attenuation of X‐rays was achieved along with good tensile strength and elongation at break. The results indicate that the concentration of styrene in the SBS and W loading substantially affected the attenuation, mechanical and rheological properties, and tensile stress relaxation rates. The thermal conductivity increased by >100%, and after gamma irradiation, faster cooling was observed in the W‐loaded composites beyond 300 phr of W loading. The 40% styrene composite demonstrated superior heat transfer at high W loadings owing to the better dispersion and distribution of the W filler in the SBS matrix. Rheological results showed that SBS‐W composites with 30% styrene had a more pronounced Payne effect than those with 40% styrene. Stress relaxation and morphological analyses also revealed changes in the W dispersion in the SBS matrix depending on the styrene content.

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Effect of shape and size of nanofillers on the viscoelasticity of polymer nanocomposites

Cited by 8 publications

References 48 publications

Insights into the Synergistic Effect of Graphene Oxide/Silica Hybrid Nanofiller for Advancing the Properties of Epoxy Resin

Insights into the Synergistic Effect of Graphene Oxide/Silica Hybrid Nanofiller for Advancing the Properties of Epoxy Resin

Enhancing the dielectric and thermal properties of polytetrafluoroethylene-based composites through designing and constructing a novel interfacial structure

Stress relaxation and thermal management in highly filled flexible styrene butadiene styrene copolymer‐tungsten composites for high‐energy radiation attenuation

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