Interparticle and particle–matrix interactions in polyethylene reinforcement and viscoelasticity

Osman, Maged A.; Atallah, Ayman

doi:10.1016/j.polymer.2005.07.030

Cited by 80 publications

(82 citation statements)

References 52 publications

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“…The reduction of the filler size down to nanometric scale can produce substantial differences in the rheology and dynamic of filled polymer in comparison to micron sized particles [2][3][4][5][6][7]. In fact, polymer composites reinforced with submicron fillers generally show significant enhancements in the viscoelastic properties compared to microcomposites at similar filler contents, associated to the appearance of a secondary plateau for the dynamic storage modulus (G′) in the low frequency regime [3,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, polymer composites reinforced with submicron fillers generally show significant enhancements in the viscoelastic properties compared to microcomposites at similar filler contents, associated to the appearance of a secondary plateau for the dynamic storage modulus (G′) in the low frequency regime [3,[6][7][8][9][10]. These effects can be explained considering that the extremely large surface area provided by nanoparticles can intensify the effect of particle-particle and/or polymer-particle thermodynamic interactions [4,5,[11][12][13][14]. When filler-filler interactions dominate, it is believed that the rheological response of the material is influenced by the destruction and reconstruction of a filler network and/or agglomerates during mechanical loading [8,9,15,16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Dorigato¹,

Pegoretti²,

Penati³

2010

Express Polym. Lett.

106

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Abstract. Linear low-density polyethylene (LLDPE) based composites were prepared by melt compounding with 1, 2, 3 and 4 vol% of various kinds of amorphous silicon dioxide (SiO2) micro-and nanoparticles. Dynamic rheological tests in parallel plate configuration were conducted in order to detect the role of the filler morphology on the rheological behaviour of the resulting micro-and nanocomposites. A strong dependence of the rheological parameters from the filler surface area was highlighted, with a remarkable enhancement of the storage shear modulus (G′) and of the viscosity (η) in fumed silica nanocomposites and in precipitated silica microcomposites, while glass microbeads only marginally affected the rheological properties of the LLDPE matrix. This result was explained considering the formation of a network structure arising from particle-particle interactions due to hydrogen bonding between silanol groups. A detailed analysis of the solid like behaviour for the filled samples at low frequencies was conducted by fitting viscosity data with a new model, based on a modification of the original De Kee-Turcotte expression performed in order to reach a better modelling of the high-frequency region.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Dorigato¹,

Pegoretti²,

Penati³

2010

Express Polym. Lett.

106

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“…Transmission electron microscopy and X-ray diffraction are widely used but provide qualitative assessment only. Alternatively, dynamic rheology may provide a semi-quantitative evaluation of the clay nanoplatelets dispersion degree as the reduction of the filler size down to nanometric scale substantially modifies the viscoelastic properties of filled polymers [30][31][32][33]. Actually, it is well admitted that the exfoliated and/ or disordered intercalated silicate layers form a network type structure rendering the system highly elastic as revealed by the appearance of a secondary plateau for the dynamic storage modulus (G!)…”

Section: Background On Assessment Of Nanofillermentioning

confidence: 99%

Effect of injection molding parameters on nanofillers dispersion in masterbatch based PP-clay nanocomposites

Rajesh¹,

Soulestin²,

Lacrampe³

et al. 2012

Express Polym. Lett.

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Abstract. The effect of injection molding parameters (screw rotational speed, back pressure, injec-tion flow rate and holding pressure) on the nanofiller dispersion of melt-mixed PP/clay nanocomposites was investigated. The nanocomposites containing 4 wt% clay were obtained by dilution of a PP/clay masterbatch into a PP matrix. The evaluation of the dispersion degree was obtained from dynamic rheological measurements. The storage modulus and complex viscosity exhibit significant dependence on the injection molding parameters. PP/clay nanocomposite molded using more severe injection parameters (high shear and long residence time) displays the highest storage modulus and complex viscosity, which illustrates the improved dispersion of clay platelets. This better dispersion leads to better mechanical properties particularly higher Young modulus, tensile strength and unnotched impact strength. A Taguchi analysis was used to identify the influence of individual process parameters. The major individual parameter is the injection flow rate, whose increase improves nanoclay dispersion. The combination of high back pressure and high screw rotational speed is also necessary to optimize the dispersion of clay nanoplatelets.

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“…Therefore, in this study, the behaviour of suspensions containing protein particles is compared with the properties of synthetic colloidal particles found in other studies. [10][11][12][13][14][15][16][17] Protein particles can be involved in several types of interactions, for example, hydrophobic, Van der Waals and hydrogen-bridge type interactions. These interactions are mainly reversible and weak.…”

Section: Introductionmentioning

confidence: 99%

Elastic Networks of Protein Particles

et al. 2009

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This paper describes the formation and properties of protein particle suspensions. The protein particles were prepared by a versatile method based on quenching a phase-separating protein-polysaccharide mixture. Two proteins were selected, gelatin and whey protein. Gelatin forms aggregates by means of reversible physical bonds, and whey protein forms aggregates that can be stabilized by chemical bonds. Rheology and microscopy show that protein particles aggregate into an elastic particle gel for both proteins. Properties similar to model systems of synthetic colloidal particles were obtained using protein particle suspensions. This suggests that the behaviour of the particle suspensions is mainly governed by the mesoscopic properties of the particle networks and to a lesser extent on the molecular properties of the particles.

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Interparticle and particle–matrix interactions in polyethylene reinforcement and viscoelasticity

Cited by 80 publications

References 52 publications

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Effect of injection molding parameters on nanofillers dispersion in masterbatch based PP-clay nanocomposites

Elastic Networks of Protein Particles

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