Effect of Ideal, Organic Nanoparticles on the Flow Properties of Linear Polymers:  Non-Einstein-like Behavior

Tuteja, Anish; Mackay, Michael E.; Hawker, Craig J.; Horn, Brooke A. Van

doi:10.1021/ma050974h

Cited by 219 publications

(274 citation statements)

References 62 publications

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“…A similar model system has been also studied by Zhang and Archer [14] and Sarvestani and Picu [11]. For such a system, molecular simulations [2,10] estimated that a bridging network linking neighboring nanoparticles forms once the wall-to-wall distance between nanoparticles, d w , approximated by [18] …”

Section: Terminal Relaxation Timementioning

confidence: 99%

A reptation-based model to the dynamics and rheology of linear entangled polymers reinforced with nanoscale rigid particles

Kabanemi

Hétu

2010

Journal of Non-Newtonian Fluid Mechanics

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A reptation-based model to the dynamics and rheology of linear entangled polymers reinforced with nanoscale rigid particles Kabanemi, Kalonji K.; Hétu, Jean-Francois Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. is its reptation time in the neat polymer, ad is the fraction of attached monomers per chain, and N is the number of monomers per chain. Hence, the overall relaxation is extremely retarded by attractive nanoparticles in the limit of strongly adsorbed chains. Also, it is found that the effective reptation time, d,eff , can be controlled through five main parameters, i.e., the molecular weight of the polymer chain, N, the size of the nanoparticles, d f , the density of attractive site on the nanoparticle surface, n as , the monomer-nanoparticle energetic interaction, ε, and the nanoparticle volume fraction, f . The nonequilibrium dynamics of detachment/re-attachment of monomers from/to nanoparticle surfaces under flow conditions is incorporated in the model to elucidate the effect of monomer-surface interactions on the nonlinear viscoelastic behavior. The resulting model correctly captures the linear dynamical properties and shear rheological behaviors of nanocomposite systems studied. Under very slow shear flow conditions, these filled systems exhibit a strong non-Newtonian behavior and a large enhancement in the viscosity as a certain number of monomers in the chain are attached to nanoparticle surfaces, while at very high shear rates, the neat polymer dominates the shear thinning behavior, suggesting that addition of nanoparticles contributes negligible to the viscosity in strong flows. A picture that is based on transient polymer-particle surface interactions, i.e., the detachment/re-attachment dynamics of monomers from/to nanoparticle surfaces is proposed to interpret the observed huge alteration in rheological properties. Crown

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Section: Terminal Relaxation Timementioning

confidence: 99%

A reptation-based model to the dynamics and rheology of linear entangled polymers reinforced with nanoscale rigid particles

Kabanemi

Hétu

2010

Journal of Non-Newtonian Fluid Mechanics

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“…4a, d). Tuteja et al [31] found a nonlinear dependence for entangled polymer melt flow through addition of nanoparticles and attributed the system zero shear viscosity and relaxation modulus decrease to lower interparticle distance than polymer chain dimension. The observed phenomenon was assigned to two mechanisms: free volume increase and chain constraint release.…”

Section: Discussionmentioning

confidence: 99%

How do soft nanoparticles affect temperature-induced nonlinearity of a UCST copolymer blend?

Ghasemirad

Mohammadi

2014

Colloid Polym Sci

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Temperature-induced nonlinearity of an upper critical solution temperature (UCST) copolymer blend and its nanocomposites containing 5 wt% mono-size soft nanoparticles (SNPs) were investigated. Mechanical and thermal energies contribution into the nonlinearity of UCST copolymer blend was 8.9×10 3 Jm −3 and 2.2×10 3 Jmol −1 , respectively. Addition of SNP did not change the system thermal-based nonlinearity, while altered its mechanical contribution at constant heating and solicitation conditions. It diminished to 0.4× 10 3 Jm −3 in the nanocomposite containing nano-size dispersion of aged SNPs. Micron-size agglomeration of the fresh SNPs in the nanocomposite; however, enhanced the required mechanical energy for nonlinearity to 4.1×10 3 Jm −3 . Shorttime annealing of the nanocomposite with micron-size agglomerates reduced its mechanical energy part to 2.8 × 10 3 Jm −3 , while annealing extension maximized it at 9.3× 10 3 Jm −3 . Heating rate increase amplified the thermal contribution into the nonlinearity at constant or reduced mechanical contribution. Finally, room-temperature annealing magnified the temperature-induced nonlinearity of the UCST copolymer blend at minimum mechanical contribution.

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“…54,55 has been reported. 56,57 The storage (G') and loss (G") moduli from frequency and strain sweeps for all of the NH 2 PDMS samples with different amounts of 4DCA are collected in Figures S24 and S25 (SI section). The data show that both samples in which the COOH/NH 2 ratio is 100% are not gels: in the linear viscoelastic regions, G' remains lower than G".…”

Section: Degradation Of Trichloroethylene (Tce) In Methanol Suspensiomentioning

confidence: 99%

Polydimethylsiloxane as a Matrix for the Stabilization and Immobilization of Zero‑Valent Iron Nanoparticles. Applications to Dehalogenation of Environmentally Deleterious Molecules

Mercado¹,

Weiss²

2018

J. Braz. Chem. Soc.

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A wet-synthetic method is described to obtain magnetic, air-stable, zero-valent iron nanoparticles coated with an alkanedioic acid. The particles can be immobilized in an amino-substituted polysiloxane matrix to provide materials capable of dechlorinating, debrominating, and deiodinating a wide variety of halogenated organic molecules dissolved initially in a highly polar medium. The methodology involves diffusion of the organic molecules into the polysiloxane matrix, their reaction with the embedded iron nanoparticles, and then diffusion of the dehalogenated products back into the polar medium or into the air. Thus, the abilities of the coated particles, as suspensions or within an amino-substituted polysiloxane matrix crosslinked with succinic acid, to dehalogenate various organic molecules (especially the model compounds, bromobenzene and chlorobenzene), have been assessed. Data from several spectroscopic methods demonstrate that the particles are in a crystalline α-Fe phase surrounded by the diacid shell. The effect of embedding 10 wt.% of the particles in amino-substituted polysiloxane-diacid matrices with different COOH/NH 2 group ratios and the viscoelastic properties of the polymeric materials have been investigated as well. Potential uses of these gel-like materials to remove halogenated pollutants from various types of aquifers are mentioned.

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Effect of Ideal, Organic Nanoparticles on the Flow Properties of Linear Polymers: Non-Einstein-like Behavior

Cited by 219 publications

References 62 publications

A reptation-based model to the dynamics and rheology of linear entangled polymers reinforced with nanoscale rigid particles

A reptation-based model to the dynamics and rheology of linear entangled polymers reinforced with nanoscale rigid particles

How do soft nanoparticles affect temperature-induced nonlinearity of a UCST copolymer blend?

Polydimethylsiloxane as a Matrix for the Stabilization and Immobilization of Zero‑Valent Iron Nanoparticles. Applications to Dehalogenation of Environmentally Deleterious Molecules

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