Erosion and breakup of polymer drops under simple shear in high viscosity ratio systems

Lin, Bin; Sundararaj, Uttandaraman; Mighri, Frej; Huneault, Michel A.

doi:10.1002/pen.10073

Cited by 46 publications

(48 citation statements)

References 35 publications

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“…Small particles of the dispersed phase may also be expected in the early stage of mixing due to erosion and tip-streaming. [17,21,22] Between the kneading zones, the shear rate and shear stress are lower than those in the kneading zones. In this region of the extruder, the polymer melt relaxes and the relaxation process helps to further break the films of the dispersed phase into fibers.…”

Section: Resultsmentioning

confidence: 99%

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Morphology Development of Polymer Blends in Extruder: The Effects of Compatibilization and Rotation Rate

Li¹,

Sundararaj²

2009

Macro Chemistry & Physics

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The effects of reactive compatibilization and extruder rotation rate on morphology development of polymer blends are studied. Morphology develops faster in compatibilized blends than that in their uncompatibilized counterparts. Based on force analysis, it has been proved that compatibilization facilitates dispersion by reducing slip at the interface of polymer phases. Rotation rate influences the morphology development of polymer blends by changing the residence time of polymers in the extruder. For uncompatibilized blends, the 400 rpm run results in finer microstructure at the outlet of the extruder than the 1 000 rpm run. Compatibilization suppresses this effect by reaching a steady‐state morphology before the outlet and results in similar microstructure for the 400 and 1 000 rpm runs.magnified image

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Section: Resultsmentioning

confidence: 99%

“…[8,10] Sundararaj et al [26] and Levitt et al [7] investigated sheet formation under shear in molten polymers. Lin et al [16,17,22] studied polymer drop breakup under shear in molten polymers. These progresses in fluid mechanics research inspired our revisit of morphology development in polymer blends.…”

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confidence: 99%

Morphology Development of Polymer Blends in Extruder: The Effects of Compatibilization and Rotation Rate

Li¹,

Sundararaj²

2009

Macro Chemistry & Physics

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“…Compared to the conventional PET/PE blend, the PET phase presents well-defined microfibrils formed through the ''slit die extrusion-hot stretching-quenching'' process. Many studies [7,29,30] have shown that an elongational flow field and a small viscosity ratio (less than or close to unity) can facilitate fibrillation of the dispersed phase in a polymer blend. Usually, the viscosity of PET is much lower than that of the matrix HDPE, resulting in a viscosity ratio less than unity.…”

Section: Morphologymentioning

confidence: 99%

Recyclability of In Situ Microfibrillar Poly(ethylene terephthalate)/High‐Density Polyethylene Blends

Jiang¹,

Zhong²,

Li³

2007

Macro Materials & Eng

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Repetitive processing was employed to assess the recyclability of in situ microfibrillar poly(ethylene terephthalate) (PET)/high‐density polyethylene (HDPE) blends which were fabricated through a “rectangular slit die extrusion–hot stretching–quenching” process. For comparison, the conventional PET/HDPE blends were also obtained using the same processing operation but without hot stretching. The morphological observation indicated that slit die extrusion and hot stretching successfully made the dispersed PET phase deform in situ into well‐defined microfibrils. The average diameter of the microfibrils increased with the processing cycles. The rheological properties obtained from the parallel‐plate dynamic rheometer suggested that the microfibrillar blends have higher viscosity and viscoelastic moduli (storage and loss moduli) as well as better flow stability than the conventional PET/HDPE blend. More importantly, with the increase in the processing cycles, an increase in yield strength and unchanged tensile modulus were observed for in situ microfibrillar blends, while a decrease in these properties for conventional blend, indicating that the in situ microfibrillar PET/HDPE blends have promising recycling potential.magnified image

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“…Two devices are commonly used: one is Couette cell and the other is a system of parallel plates. The Couette cell is the most popular device used for generating simple shear flow field [10][11][12][13][14][15][16][17][18]. Because of the excellent performance allowing ones to study very viscous polymers, a capability not permitted by the Couette cell [6], during the past decade parallel plate devices have been widely used [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Morphology development of PC/PE blends during compounding in a twin‐screw extruder

Yin

et al. 2006

Polymer Engineering & Sci

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The morphological development of a polycarbonate/ polyethylene (PC/PE) blend in a twin-screw extruder was studied using a scanning electron microscope (SEM). The effects of extrusion temperature, viscosity ratio (the ratio of the viscosity of the dispersed phase to that of the matrix), and the screw configuration on the morphology of the PC/PE blend during the extrusion were discussed in detail. It was found that the morphology of the dispersed particles and the interfacial adhesion between the dispersed phase and matrix were both influenced by the extrusion temperature. The dispersed phase had a spheroidal shape and a small size during the high temperature processing, and an irregular shape and a large size when it was processed at low temperature. The PC phase with a lower viscosity was easier to disperse and also to coalesce. Therefore, the deformation of the low-viscosity dispersed phase during the processing was more intense than that of the high-viscosity dispersed phase. By comparing the effects of the different screw configurations on the morphology development of the PC/PE blend, it was found that the melting and breaking up of the dispersed phase were mainly affected in the initial blending stages by the number of the kneading blocks. While a kneading block with a 90 degree staggering angle was used, the size of the dispersed particles decreased and the long fibers were shortened, the large particles were drawn by the additional kneading zone. Finally, all of these structures were completely changed to the short fibers. POLYM.

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Erosion and breakup of polymer drops under simple shear in high viscosity ratio systems

Cited by 46 publications

References 35 publications

Morphology Development of Polymer Blends in Extruder: The Effects of Compatibilization and Rotation Rate

Morphology Development of Polymer Blends in Extruder: The Effects of Compatibilization and Rotation Rate

Recyclability of In Situ Microfibrillar Poly(ethylene terephthalate)/High‐Density Polyethylene Blends

Morphology development of PC/PE blends during compounding in a twin‐screw extruder

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