A calibration technique to evaluate the power‐law parameters of polymer melts using a torque‐rheometer

Márquez, Alfredo; Quijano, Jafet; Gaulin, Marc

doi:10.1002/pen.10655

Cited by 59 publications

(42 citation statements)

References 10 publications

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“…At the average shear rates of 26 s À1 for the used internal mixer (calculated according to the approach reported in ref. [59] ) the viscosity ratio is still higher than 4 h 26s À1 ðPLAÞ=h 26s À1 ðPCLÞ ¼ 5…”

Section: Resultsmentioning

confidence: 91%

Selective Localization of Nanofillers: Effect on Morphology and Crystallization of PLA/PCL Blends

Lin

Zhang

et al. 2011

Macro Chemistry & Physics

235

176

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Adding nanofillers to PLA/PCL blends to change their surface and interface properties can improve their phase morphology. Here the selective localization of CNTs and organoclays as the third component in the blend is studied. It is found that clay is selectively localized in the PLA phase and at the phase interface whereas CNTs are mainly found in the PCL phase and at the phase interface. With a reduced viscosity ratio of the blend matrices, the CNTs change their preferred localization from PCL to PLA. The effects of the different selective localization of clay and CNTs on the morphologies are studied. In addition, the crystallization behavior of ternary systems also shows a strong dependence on the selective localization of nanofillers. magnified image

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Section: Resultsmentioning

confidence: 91%

Selective Localization of Nanofillers: Effect on Morphology and Crystallization of PLA/PCL Blends

Lin

Zhang

et al. 2011

Macro Chemistry & Physics

235

176

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“…The formula that was deduced by Marquez was used as Eq. 1 (Marquez et al 1996), (1) where M is the torque value from torque rheometer (N·m), m is the viscosity coefficient (Pa·s n ), S is the rotor speed (rad·s -1 ), and n is the flow index. In Eq.…”

Section: Torque Rheological Properties Measurementmentioning

confidence: 99%

Study on the Torque Rheological Behavior of Wood Flour/Chitosan/Polyvinyl Chloride Composites

Xu¹,

Wang²,

Chen³

et al. 2015

BioResources

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Torque rheological properties of wood flour/chitosan/PVC (WF/CS/PVC) compounds were measured by a torque rheometer using roller-style rotating blades at various setting temperatures (175 and 185 °C) and rotation speeds (30, 45, 60, and 75 rpm). The torque rheological parameters were calculated based on the Marquez model and Arrhenius equation. The torque rheological curves of WF/CS/PVC composites were similar to WF/PVC composites without chitosan. The classical Marquez model was verified to be suitable for both WF/PVC and WF/CS/PVC composites. Specifically, the activation energy (ΔE), n value, and range of C(n)m for the former and latter were 27.698 kJ·mol -1 and 29.237 kJ·mol -1 , 0.382 and 0.381, and 4.415 to 5.749 N·m·s n and 4.652 to 6.079 N·m·s n , respectively. The rheological properties of WF/CS/PVC composites did not show a great qualitative enhancement compared to WF/PVC composites.

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“…The two polymers were melt blended using a Haake Rheomix 600 internal mixer equipped with a 69 cm 3 chamber and roller-type rotors for 8 min at 100 rpm and at 190 8C. Under these mixing conditions an average shear rate of 27 s was estimated using an empirical calibration technique of Marquez et al [34]. The materials were weighed accurately so that the mixing chamber was filled to 70% of its total volume.…”

Section: Melt Blendingmentioning

confidence: 99%

Continuity development in polymer blends of very low interfacial tension

Bhadane

Champagne

Huneault

et al. 2006

Polymer

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Continuity development in polymer blends of very low interfacial tension AbstractPhase continuity development and co-continuous morphologies are highly influenced by the nature of the interface in immiscible polymer blends. Blends of ethylene-propylene-diene terpolymer (EPDM) and polypropylene (PP) possess an interfacial tension of about 0.3 mN/m and provide an interesting model system to study the detailed morphology development in a very low interfacial tension binary system. A variety of blends with viscosity ratios of 0.2-5.0 and shear stresses of 11.7-231.4 kPa were considered. Using a variety of sophisticated morphology protocols it is shown that at low blend compositions, the dispersed phase actually exists as stable fibers of extremely small diameter of 50-200 nm and the continuity develops by fiber-fiber coalescence. An analysis using break-up times from Tomotika theory also supports the notion of highly stable dispersed fiber formation. These results challenge the current view of the dispersed phase as small spherical droplets. It is shown, under these conditions, that a seven-fold variation in the viscosity ratio has virtually no influence on % continuity or morphology, while a large change in the matrix shear stress from 11.7 to 90.9 kPa has an important effect on pore diameter. Both sides of the continuity diagram are studied and highly symmetrical continuity behavior is observed with composition. In fact a single master continuity curve is observed for these blends varying in viscosity ratio from 0.7-5.0 and with shear stresses from 11.7-90.9 kPa. Although the glass transition temperatures indicate that these materials are completely immiscible after melt mixing and cooling, it is shown that the blends demonstrate the morphological features of a partially miscible system. These results support a concept that the blend was partially miscible during melt blending, at which time the gross morphological features of the blend were developed, but becomes fully phase separated upon cooling. It appears that the quenching of the EPDM/PP blend from the melt is rapid enough to preserve the imprint of that partial miscibility on the gross blend morphology. q

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A calibration technique to evaluate the power‐law parameters of polymer melts using a torque‐rheometer

Cited by 59 publications

References 10 publications

Selective Localization of Nanofillers: Effect on Morphology and Crystallization of PLA/PCL Blends

Selective Localization of Nanofillers: Effect on Morphology and Crystallization of PLA/PCL Blends

Study on the Torque Rheological Behavior of Wood Flour/Chitosan/Polyvinyl Chloride Composites

Continuity development in polymer blends of very low interfacial tension

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