Experimental investigation of the morphology development of polyblends in corotating twin-screw extruders

Potente, H.; Bastian, M.; Gehring, A.; Stephan, M.; Pötschke, P.

doi:10.1002/(sici)1097-4628(20000502)76:5<708::aid-app13>3.3.co;2-t

Cited by 13 publications

(22 citation statements)

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“…In both single‐screw and twin‐screw extruder kneading blocks, droplet broke‐up and shrinkage under shear stress is the main process since η TPU > η PLA at low shear frequency. In such condition, no fibrillation occurs both in single‐screw extruder and twin‐screw extruder . For the following IM processes, the stretching stress field is considerably weak.…”

Section: Resultsmentioning

confidence: 99%

Morphology Evolutions and Mechanical Properties of In Situ Fibrillar Polylactic Acid/Thermoplastic Polyurethane Blends Fabricated by Fused Deposition Modeling

Wang

Zhang

Sun

et al. 2019

Macro Materials & Eng

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There are many studies devoted to conquer the strength–ductility trade‐off dilemma of polylactic acid (PLA) by flexible elastomer blending, like thermoplastic polyurethane (TPU), but little is known about the effects of the fused deposition modeling (FDM) process on the in situ morphology evolution of the elastomers. In this work, the effects of the three successive drawing processes in FDM on the morphology evolution of the dispersed TPU in the PLA matrix, and the toughening behavior of FDM‐printed PLA/microfibrillar‐TPU blends, are systematically studied. The results manifest that the average length of the TPU microfibrils can be turned precisely from 67.24 to 103.72 µm. The in situ microfibrillation process can remarkably improve the PLA crystallization capability and interfacial interaction. More interestingly, the inevitable decrease of impact strength of FDM‐printed part induced by the voids is compensated by the network‐like TPU microfibrils formed during the layer‐by‐layer printing. These inspiring findings suggest that the in situ fibrillation process can conquer the inherent weaknesses of both FDM process and PLA materials, providing facile and efficient method for fabricating high toughness PLA parts.

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Section: Resultsmentioning

confidence: 99%

Morphology Evolutions and Mechanical Properties of In Situ Fibrillar Polylactic Acid/Thermoplastic Polyurethane Blends Fabricated by Fused Deposition Modeling

Wang

Zhang

Sun

et al. 2019

Macro Materials & Eng

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“…The morphological measurements carried out for the blends with 10, 20 and 40 wt% LCP (see Figs. [2][3][4] show that, at the beginning of the extruder, the LCP structures are essentially droplets distributed along the thermoplastic matrix. These LCP structures are progressively elongated along the extruder length, giving rise to fibrillar structures at the exit of the die.…”

Section: Morphologymentioning

confidence: 99%

“…The study of the evolution of polymer blend morphology during processing receives more and more attention and different techniques have been used in order to obtain an improved knowledge on this subject (see, for example, the works of Shi and Utracki [1], Tyagi and Ghosh [2], Potente et al [3,4] and Scott and Macosko [5]). During compounding, several factors influence the final morphology, including shear, elongational and hydrodynamic forces involved during compounding and also the rheological properties of the components of the blend.…”

Section: Introductionmentioning

confidence: 99%

Evolution of morphological and rheological properties along the extruder length for blends of a commercial liquid crystalline polymer and polypropylene

Filipe

Cidade

Wilhelm

et al. 2004

Polymer

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“…It is known that morphology development during processing is one of the critical factors to determine the performance of immiscible polymer blends. Regarding the morphology development, several literatures have been reported 3–8. For single‐screw extruder, the morphology development of difference stages has been studied 9,10.…”

Section: Introductionmentioning

confidence: 99%

Morphology study of immiscible polymer blends in a vane extruder

Chen

Liu

et al. 2012

J of Applied Polymer Sci

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This study reports the morphology development of polymer blends in a novel vane extruder in which polymer mainly suffers from elongational deformation field. Rapidly cooled samples of polypropylene/polystyrene (PP/PS) are collected in the vane extruder after stable extrusion. Furthermore, the shape and size of the dispersed phase from initial to final stages are analyzed. In addition, in order to compare the final size of the dispersed phase, different immiscible blends, including polypropylene/polyamide and PP/PS, are prepared by vane extruder and twin‐screw extruder, respectively. The results show that the dispersed phase is made to change rapidly from stretched striations to droplets under the strong elongational deformation field in the vane extruder. Furthermore, the droplet size of dispersed phase of blends prepared by vane extruder is much smaller than that prepared by twin‐screw extruder, indicating that the vane extruder is more efficient in mixing for immiscible polymer blends. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Experimental investigation of the morphology development of polyblends in corotating twin-screw extruders

Cited by 13 publications

References 0 publications

Morphology Evolutions and Mechanical Properties of In Situ Fibrillar Polylactic Acid/Thermoplastic Polyurethane Blends Fabricated by Fused Deposition Modeling

Morphology Evolutions and Mechanical Properties of In Situ Fibrillar Polylactic Acid/Thermoplastic Polyurethane Blends Fabricated by Fused Deposition Modeling

Evolution of morphological and rheological properties along the extruder length for blends of a commercial liquid crystalline polymer and polypropylene

Morphology study of immiscible polymer blends in a vane extruder

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