Computation of the morphological changes of a polymer blend along a twin‐screw extruder

Delamare, L.; Vergnes, Bruno

doi:10.1002/pen.10565

Cited by 61 publications

(44 citation statements)

References 28 publications

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“…The preceding results show a significant influence of the mass flow rate on morphology development. Delamare and Vergnes showed that higher feed rates produce 21 lower residence time and are associated with larger particles. In the case of laminar morphology development, the processing window is small.…”

Section: Feed Rate Effect On Morphologymentioning

confidence: 98%

The development of laminar morphology in a co-rotating twin screw extruder

Rodriguez-Veloz

Kamal

1999

Adv. Polym. Technol.

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Laminar morphology of high‐density polyethylene (HDPE)/polyamide‐6 (PA‐6) blends was obtained, for the first time, in a co‐rotating twin screw extruder. The morphology analysis in the interior of the adapter, which connects the extruder with a slit die, revealed that, under specific processing conditions, it is possible to produce layers of PA‐6 in the end of the screw zone of the extruder. The micrographs of the extruded final products showed distributed layers across the sample thickness and along the flow direction. The effect of design and processing variables such as adapter angle, die gap, temperature profile, feed rate, and screw speed on the final product morphology were evaluated. In this research, blends were obtained with toluene permeability reduced by up to 113 times from the permeability of the matrix alone. This value is 2.5 times better than the best value reported for products of single screw extrusion. Mechanical tests showed that the HDPE/PA‐6 extrudates maintain stiffness and tensile strength values comparable to those of polyethylene. In order to obtain products with optimum balance between the permeability and the mechanical properties, a statistical analysis was carried out. It produced useful information regarding the important processing and design factors that affect the product properties. © 1999 John Wiley & Sons, Inc. Adv Polym Techn 18: 89–108, 1999

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Section: Feed Rate Effect On Morphologymentioning

confidence: 98%

The development of laminar morphology in a co-rotating twin screw extruder

Rodriguez-Veloz

Kamal

1999

Adv. Polym. Technol.

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“…The global computation follows an iterative scheme, since the calculations proceed backward, starting from an arbitrary initial value of the die exit temperature. This software has been successfully used for many applications, such as the study of starch transformation, 24 of blend morphology evolution, 25 or reactive extrusion. 26,27 Figure 4 compares, for different processing conditions, the temperatures measured using the two techniques, that is, flush-mounted PT transducers and a manual thermocouple stuck into the collected melt nut.…”

Section: Softwarementioning

confidence: 99%

Experimental and theoretical study of twin-screw extrusion of polypropylene

Carneiro

Covas

Vergnes

2000

J. Appl. Polym. Sci.

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The flow of a polypropylene in a self‐wiping corotating twin‐screw extruder was characterized by measuring the pressure, temperature, and residence time along the screw profile. The influence of the operating conditions (feed rate, screw speed, barrel temperature) and screw profile was studied. Flow modeling was performed using the Ludovic© software and measured and calculated pressure, temperature, residence time, and energy consumption were compared. The values of the temperature close to the melting zone were overestimated by the model, which considers instantaneous melting upon the first restrictive screw element. If the program assumes that melting occurs at the screw location identified experimentally, a correct description of the temperatures along the screw profile is produced. The influence of the processing conditions (feed rate, screw speed, barrel temperature, screw profile) is well described by the model. These results put in evidence the importance of including an adequate melting model in the modeling of the twin‐screw extrusion process. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1419–1430, 2000

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“…A better and more readable presentation of such a development was given by Vergnes [154,155] in 1996-1998. They propose and describe forward fluid mechanical and energy balances (Table 6.5).…”

Section: Process Simulation Of Intermeshing Co-rotating Twin-screw Exmentioning

confidence: 99%

“…A more sophisticated development of this model, considering the detailed flows in the kneading disc blocks, was published by Huneault [144,161] of the same group in 1995-96. Delamare and Vergnes [154] have sought to improve the model by attempting to include coalescence.…”

Section: Process Simulation Of Intermeshing Co-rotating Twin-screw Exmentioning

confidence: 99%

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Manufacturing of Polymer Blends Using Polymeric and Low Molecular Weight Reactive Compatibilizers

Kim

White

2011

Encyclopedia of Polymer Blends

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During the past 50 years there has been a great increase in the development and production of blends of different polymers because many of them have performed well in new applications. The application areas of the various polymeric material blends systems are limitless and blending of the polymers has also been recognized as a faster and less expensive method of developing a new material than synthesizing a new polymer with a new chemical structure.Reactive blending has been a very attractive blending compatibilization strategy for immiscible polymer blend systems with a wisely selected chemistry since the 1970s. The properties and performance of polymer blends depend on the blend morphology. The morphology of a polymer blend is mainly determined by (i) polymer components, (ii) interfacial reaction, and (iii) mixing process. For a commercial polymer blend manufacturing process, possible maximum production rate, and process controls to minimize energy consumption during a manufacturing process are also required for lowering product cost (Figure 6.1). The major equip ment for manufacturing various kinds of polymer blends is a screw extruder. Understanding of a screw extrusion process design and operation is critical. An intermeshing co-rotating twin-screw extruder is the major continuous processing machine among various screw extruders and is the main subject of discussion in this chapter.Section 6.2 briefly describes reactive blending and compatibilization. We then discuss the mixing and morphology development during polymer melt blending process in Section 6.3. In Sections 6.4 and 6.5 we turn to intermeshing co-rotating twin-screw extrusion technology, including the modeling of a modular intermeshing co-rotating twin-screw extrusion process, and extrusion process design for reactive polymer blending. First Edition. Edited by Avraam I. Isayev.

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Computation of the morphological changes of a polymer blend along a twin‐screw extruder

Cited by 61 publications

References 28 publications

The development of laminar morphology in a co-rotating twin screw extruder

The development of laminar morphology in a co-rotating twin screw extruder

Experimental and theoretical study of twin-screw extrusion of polypropylene

Manufacturing of Polymer Blends Using Polymeric and Low Molecular Weight Reactive Compatibilizers

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