Rheological Behavior and Interaction of Polycarbonate/Barium Sulfate Composites

Lai, B; Ni, Xiuyuan

doi:10.1080/00222340802219529

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…The complex viscosity (not shown) presents similar behavior in both POM and the nanocomposite with 1 phr BaSO 4 ; this agrees with results by Lai et al [35] . Figure 9 presents the modulus (storage and loss) versus frequency for POM and nanocomposite with 1 phr particle concentration.…”

Section: Discussionsupporting

confidence: 92%

“…It is likely that the fi rst stage with gradual shear thinning is due to fl ow-induced chain disentanglement and lubrication of shear surfaces by the presence of the particles [35] . However, the second more pronounced slope change is not due to a rheological mechanism but to initial degradation of the polymer matrix during processing.…”

Section: Rheological Propertiesmentioning

confidence: 99%

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Influence of X-ray opaque BaSO4 nanoparticles on the mechanical, thermal and rheological properties of polyoxymethylene nanocomposites

Romero‐Ibarra

Bonilla-Blancas

Sanchez-Solis

et al. 2012

Journal of Polymer Engineering

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This work evaluates the infl uence of a radiopaque reinforcement, barium sulfate (BaSO 4 ), on the mechanical, rheological and thermal properties of polyoxymethylene (POM). Nanocomposites of POM containing spherical nanoparticles of BaSO 4 (0, 1, 2, 3 phr) were obtained by melt extrusion in a twin-screw equipment followed by injection molding. The mechanical, thermal and rheological properties of these nanocomposites and the dispersion state of the particles were investigated. Scanning and transmission electron microscopy revealed the morphology of the products. The main objective of this work is the production of nanocomposites with sulfate concentration enough to acquire radiopaque properties while maintaining the mechanical properties of the matrix. In this regard, mechanical and rheological properties were found similar to those of the polymer matrix, but radiopaque contrast tests revealed the infl uence of the nanoparticles concentration on the optical properties of the composites. The production of these nanocomposites suggests potential applications in the biomedical sector given their unique radioopacity properties.

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Section: Discussionsupporting

confidence: 92%

Section: Rheological Propertiesmentioning

confidence: 99%

Influence of X-ray opaque BaSO4 nanoparticles on the mechanical, thermal and rheological properties of polyoxymethylene nanocomposites

Romero‐Ibarra

Bonilla-Blancas

Sanchez-Solis

et al. 2012

Journal of Polymer Engineering

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“…Mackay and co‐workers suggested an increase in free volume and confinement of polymer chains in the inter‐particle gaps as primary mechanisms yielding a reduced viscosity in their PS/spherical crosslinked PS‐nanoparticle blends 12 . Several groups have also proposed a ''ball‐bearing effect'' as the probable mechanism for the viscosity decrease, in which they suggest that a high localized shear is generated in the vicinity of the nanoparticles due to their spherical geometry, and that this high shear allows for the disentanglement of the surrounding polymer chains and easy slippage of the chains past one another 24–28 . Jain et al forwarded a theory based on the selective adsorption of polymer chains on the nanoparticle surface in PP‐silica nanocomposites 29 .…”

Section: Introductionmentioning

confidence: 99%

POSS‐inducedrheological and dielectric modification of polyethersulfone

Shankar

Kemp

Smith

et al. 2021

J of Applied Polymer Sci

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Polyhedral oligomeric silsesquioxane (POSS) nanostructured chemicals, when incorporated at low levels in thermoplastics, provide processability enhancement and viscosity reduction without compromising other bulk physical properties. POSS has been relatively unexplored in high performance polymers, and there is incomplete understanding of the mechanisms by which POSS produces flow improvements. In this study, polyethersulfone (PES) was melt‐blended with trisilanolphenyl (TSP)‐POSS and dodecaphenyl (DP)‐POSS; and rheological, dielectric spectroscopy, and scanning electron microscopy evaluations were conducted to identify structure/property/processing relationships. TSP‐POSS yielded greater processability improvements and viscosity reductions than DP‐POSS, suppressed low temperature relaxations to a larger extent, and displayed a greater degree of nanoscale dispersion in the polymer matrix. The findings are evaluated in terms of competing theories of POSS viscosity reduction.

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“…Likewise, Berret et al (2004) reported that supermicellar aggregates were formed when yttrium-based inorganic nanoparticles were added to aqueous solutions of polyelectrolyte-neutral block copolymers. Furthermore, few researchers documented the viscosity reduction in polymer nanocomposites (Roberts et Lai and Ni, 2008). The introduction of nanoparticles to SBF-polymeric fluid blends results in interactions that will produce a more complex threedimensional network structure.…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Surfactant-Based and Polymeric Nano-Fluids

Fakoya

Shah

2013

All Days

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Nanotechnology is well established in several industries. However, the emergence of its application is recent in the oil and gas industry; a fact corroborated by the current surge of publication in literature. Interestingly, advancement in research has shown that nanotechnology can improve the rheological properties of surfactant-based fluids (SBF) and polymeric fluids.To date, this application focuses more on polymeric fluids than on SBF. Furthermore, a few or none of the studies address the detrimental effect of nanotechnology on rheological properties of these fluids once certain limits are exceeded. Likewise, little or no information is available regarding the application of nanotechnology in SBF-polymeric fluid blends.This paper presents an experimental investigation of nanotechnology on the rheological properties of SBF, polymeric fluids, and SBF-polymeric fluid blends. The surfactant-based and polymeric fluids are composed of 5% SBF in 4% KCl and 33 lb/Mgal guar in 4% KCl respectively. Blend A was prepared by adding 75% vol. of surfactant-based fluid to 25% vol. of polymeric fluid; while Blend B resulted from the addition of 25 and 75% vol. of these fluids. The 20 nm silica nanoparticles were added to achieve three nano-fluid concentrations (0.058%, 0.24%, and 0.4% wt.) for each clean fluid. Rheological data were gathered by conducting viscometry and frequency sweep tests using the Bohlin CS-50 rheometer within a temperature range of 75 to 175 F. The results indicate that 20 nm silica nanoparticles are beneficial in terms of enhancing rheological properties in surfactant-based and polymeric nano-fluids up to particle concentration of 0.24% and 0.4% respectively. Blend A nano-fluids show similar results at 0.058%, and only at 0.4% at high shear rates. Similarly, Blend B displayed favorable results up to 0.24% and at high temperature applications only (125 to 175 F). Finally, relative viscosity correlations are developed for predicting viscosity of nano-suspensions.The application of nanotechnology on the rheological properties of SBF, polymeric fluids, and SBF-polymeric fluid blends delivers on great benefits, if nanoparticle concentrations are carefully selected. These nano-fluids will be applicable for oilfield operations such as hydraulic fracturing.

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Rheological Behavior and Interaction of Polycarbonate/Barium Sulfate Composites

Cited by 12 publications

References 20 publications

Influence of X-ray opaque BaSO4 nanoparticles on the mechanical, thermal and rheological properties of polyoxymethylene nanocomposites

Influence of X-ray opaque BaSO4 nanoparticles on the mechanical, thermal and rheological properties of polyoxymethylene nanocomposites

POSS‐inducedrheological and dielectric modification of polyethersulfone

Rheological Properties of Surfactant-Based and Polymeric Nano-Fluids

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