Linear Viscoelastic Properties of Suspensions of Rigid Hairy Particles in a Polymeric Matrix

Dagréou, Sylvie; Kasseh, Abdeslam; Allal, Ahmed; Marin, G.; Aı̈t-Kadi, A.

doi:10.1002/cjce.5450800614

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…We tested this theoretical approach in the case of polystyrene filled with rigid hairy particles [21]. We showed a reasonable agreement between the experimental results and the theoretical predictions, up to a volume fraction close to percolation.…”

Section: Modeling Of the Linear Viscoelastic Properties Of Emulsions supporting

confidence: 64%

Modeling of the linear viscoelastic properties of oil-in-water emulsions

Dagréou

Mendiboure

Allal

et al. 2005

Journal of Colloid and Interface Science

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Section: Modeling Of the Linear Viscoelastic Properties Of Emulsions supporting

confidence: 64%

Modeling of the linear viscoelastic properties of oil-in-water emulsions

Dagréou

Mendiboure

Allal

et al. 2005

Journal of Colloid and Interface Science

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“…More recently, interest has focused on the development of nanocomposites. In this case, the fillers can be organic or inorganic nanosized particles: silica particles, − mica, and more recently carbon nanotubes. − …”

Section: Introductionmentioning

confidence: 99%

Nanostructure and Mechanical Properties of Polybutylacrylate Filled with Grafted Silica Particles

et al. 2006

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We investigate the nanostructure and the linear rheological properties of polybutylacrylate (PBA) filled with Stöber silica particles grafted with PBA chains. The silica volume fractions range from 1.8 to 4.7%. The nanostructure of these suspensions is investigated by small-angle neutron scattering (SANS), and we determine their spectromechanical behavior in the linear region. SANS measurements performed on low volume fraction composites show that the grafted silica particles are spherical, slightly polydisperse, and do not form aggregates during the synthesis process. These composites thus constitute model filled polymers. The rheological results show that introducing grafted silica particles in a polymer matrix results in the appearance of a secondary process at low frequency: for the lowest volume fractions, we observe a secondary relaxation that we attribute to the diffusion of the particles in the polymeric matrix. By increasing the silica volume fraction up to a critical value, we obtain gellike behavior at low frequency as well as the appearance of a structure factor on the scattering intensity curves obtained by SANS. Further increasing the silica particle concentration leads to composites exhibiting solidlike low-frequency behavior and to an enhanced structure peak on the SANS diagrams. This quantitative correlation between the progressive appearance of a solidlike rheological behavior, on one hand, and a structure factor, on the other hand, supports the idea that the viscoelastic behavior of filled polymers is governed by the spatial organization of the fillers in the matrix.

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“…Therefore, another explanation is required for the PBMA–SiO 2 system. Dagreou et al examined a secondary relaxation process for a suspension of polymer‐grafted solid particles in a viscoelastic matrix using a numerical simulation, where it was found that the secondary relaxation was shifted to higher frequencies as the particle size was decreased 24. In our system, an increase in Φ silica means a decrease in size of the polymer/silica composite particle, because the grafted PBMA chains become shorter.…”

Section: Resultsmentioning

confidence: 84%

“…6(b)), PBMA/SiO 2 exhibits a gel‐like behavior in the low‐frequency range instead of a crossover ( G ′ ≈ G ″ ∝ ω 0.5 ) 11, 26. This type of gel‐like behavior has been widely seen in nanocomposites consisting of non‐grafted silica particles in polymer matrices, because an interfacial layer formed by the polymer chains adsorbed on the particles (bound polymer), provides a steric repulsion between the particles (hereafter referred to as a repulsion effect) 24, 30–32. At Φ silica = 0.17 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, polymer/inorganic nanocomposites composed of densely polymer‐grafted nanoparticles dispersed in free polymer matrices have characteristic bulk properties. For example, rheological behaviors of densely polymer‐grafted nanoparticles in the same kinds of matrix polymers have been extensively investigated 11, 21, 22, 24–28. Beyou and co‐workers have demonstrated that grafting of polystyrene (PS) on fumed silica decreases the storage modulus in the molten state at low frequency 25.…”

Section: Introductionmentioning

confidence: 99%

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Viscoelastic behavior of poly(butyl methacrylate) densely grafted on silica nanoparticles

Hayashida¹,

Tanaka²,

Watanabe³

2011

Polymer International

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A series of poly(butyl methacrylate)s (PBMAs) with various molar masses (33 000-270 000 g mol −1 ), which were densely grafted on fumed silica nanoparticles (PBMA-SiO 2 ), were synthesized by surface-initiated atom transfer radical polymerization. The dynamic viscoelastic behavior of PBMA-SiO 2 was systematically investigated in the solid and molten states with oscillatory strains, and compared to that of a conventional nanocomposite (PBMA/SiO 2 ). The storage moduli of PBMA-SiO 2 and PBMA/SiO 2 are equivalent in the solid state, whereas the storage modulus of PBMA-SiO 2 is lower than that of PBMA/SiO 2 in the molten state, especially at high silica loading. This is because the formation of a network structure composed of the silica nanoparticles in PBMA-SiO 2 is strongly suppressed by the polymer brushes on the particles. In contrast, even at low silica loading, the PBMA-SiO 2 system exhibits a gel-like behavior resulting from a steric repulsion between the composite particles, because all of the tethered polymers behave as bound polymers.

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Linear Viscoelastic Properties of Suspensions of Rigid Hairy Particles in a Polymeric Matrix

Cited by 6 publications

References 14 publications

Modeling of the linear viscoelastic properties of oil-in-water emulsions

Modeling of the linear viscoelastic properties of oil-in-water emulsions

Nanostructure and Mechanical Properties of Polybutylacrylate Filled with Grafted Silica Particles

Viscoelastic behavior of poly(butyl methacrylate) densely grafted on silica nanoparticles

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