Influence of screw configuration, residence time, and specific mechanical energy in twin-screw extrusion of polycaprolactone/multi-walled carbon nanotube composites

Villmow, Tobias; Kretzschmar, Bernd; Pötschke, Petra

doi:10.1016/j.compscitech.2010.07.021

Cited by 214 publications

(151 citation statements)

References 32 publications

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“…Example microscopy and binary images are in Figure 1b. Figure 1 demonstrates that the level of dispersive mixing achieved can be increased by reducing the extruder output; in agreement with [16,18,22]. At the same screw speed (peak shear stress) a reduction in output reduces the average DOF within the screw channel increasing the mean shear stress experienced by the polymer/additive [12] thus increasing dispersion via fast rupture mechanism.…”

Section: Impact Of Extruder Outputsupporting

confidence: 65%

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Investigating the impact of operating conditions on the extent of additive mixing during thermoplastic polymer extrusion

Stratiychuk-Dear

Looney²,

Oliver³

et al. 2017

AIP Conference Proceedings

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Abstract. Adequate dispersion of the additive in polymer composites is vital to their performance. Dispersion occurs via rupture, erosion and collision induced mechanisms. Organophosphorus salt/PET nanocomposites were manufactured on a co-rotating fully intermeshing pilot scale twin screw extruder to determine the impact of operating conditions on the mixing achieved in order to understand the level of control available over the process. The effect on key dispersion mechanisms is discussed. Dispersion was found to increase with decreasing throughput, increasing screw speed and increasing molecular weight of the polymer. Linear relationships between calculated parameters including specific mechanical energy, degree of fill and specific throughput were also observed. A need for a compromise between achieving the desired level of mixing and maintaining the molecular weight of the polymer is established.

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Section: Impact Of Extruder Outputsupporting

confidence: 65%

“…The majority of recent studies examining the effect of operating conditions on dispersion focus on composites of multiwalled carbon nanotubes (MWCNTs) in polycarbonate [13,14], polylactic acid [15] and polycaprolactone [16] substrates. Organoclay/polypropylene composites are addressed in [17,18].…”

Section: Introductionmentioning

confidence: 99%

Investigating the impact of operating conditions on the extent of additive mixing during thermoplastic polymer extrusion

Stratiychuk-Dear

Looney²,

Oliver³

et al. 2017

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…The injection of the liquid plasticizer was done by means of a peristaltic pump between zone 2 and 3 of the extruder. Pressure and torque were measured during compounding and the specific mechanical energy input SME was calculated according to Equation (1) [30]:…”

Section: Materials and Compoundingmentioning

confidence: 99%

Extensional Flow Properties of Externally Plasticized Cellulose Acetate: Influence of Plasticizer Content

et al. 2013

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Elongational flow properties of polymer melts are very important for numerous polymer processing technologies such as blown film extrusion or foam extrusion. Rheotens tests were conducted to investigate the influence of plasticizer content on elongational flow properties of cellulose acetate (CA). Triethyl citrate (TEC) was used as plasticizer. Melt strength decreases whereas melt extensibility increases with increasing plasticizer content. Melt strength was further studied as a function of zero shear viscosity. The typical draw resonance of the Rheotens curve shifts to higher drawdown velocity and the amplitude of the draw resonance decreases with increasing TEC content. With respect to foam extrusion, not only are melt strength and melt extensibility important but the elongational behavior at low strain rates and the area under the Rheotens curve are also significant. Therefore, elongational viscosity as well as specific energy input were calculated and investigated with respect to plasticizer content. Preliminary foam extrusion tests of externally plasticized CA using chemical blowing agents confirm the results from rheological characterization.

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“…Features of CNTs such as excellent mechanical properties, electrical and thermal conductivity associated with their high aspect ratio and low density, have several potential benefits which are expected to manifest when they are employed as fillers in polymers [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Visualization of the conductive paths in injection moulded MWNT/polycarbonate nanocomposites by conductive AFM

Kiss-Pataki

Tiusanen

Dobrik

et al. 2014

Composites Science and Technology

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Electrical conductivity of MWNT filled polymer composites can strongly depend on the dispersion of the filler. Injection moulding of the same nanotube filled conductive composite materials can lead to significant differences in conductivities while the corresponding morphological changes seem to be moderate. Here we report on a conductive atomic microscopy (C-AFM) study of a series of polycarbonate/MWNT settings injection moulded with different injection speeds and melt temperatures, completed with optical microscopy, SEM and TEM characterization. C-AFM was found to be able to visualize the significant differences in the morphology of electrical pathways in cross section. These morphological variations seem to correlate to the differing volume resistivity data and are in agreement with the expected structural effects of injection moulding processes with different parameters.

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Influence of screw configuration, residence time, and specific mechanical energy in twin-screw extrusion of polycaprolactone/multi-walled carbon nanotube composites

Abstract: . Influence of screw configuration, residence time, and specific mechanical energy in twin-screw extrusion of polycaprolactone/multi-walled carbon nanotube composites.

Cited by 214 publications

References 32 publications

Investigating the impact of operating conditions on the extent of additive mixing during thermoplastic polymer extrusion

Investigating the impact of operating conditions on the extent of additive mixing during thermoplastic polymer extrusion

Extensional Flow Properties of Externally Plasticized Cellulose Acetate: Influence of Plasticizer Content

Visualization of the conductive paths in injection moulded MWNT/polycarbonate nanocomposites by conductive AFM

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