Effect of Die Geometry on Drawdown Force of Polypropylene at Capillary Extrusion

Seemork, Jiraporn; Siriprumpoonthum, Monchai; Lee, Young-Jun; Nobukawa, Shogo; Yamaguchi, Masayuki

doi:10.1002/adv.21477

Cited by 20 publications

(21 citation statements)

References 50 publications

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“…The extrusion was performed at a constant shear rate of 14.6 s −1 (a constant piston speed), which corresponded to the lowest shear rate for the machine using the die with an l / d ratio of 10/1. A detailed description of the experimental procedure has been described elsewhere …”

Section: Methodsmentioning

confidence: 99%

Impact of Mixing Method on Rheological Instability for Binary Mixture of Linear Low‐Density Polyethylene

et al. 2016

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The impact of different mixing methods on flow instability in capillary extrusion was examined using binary mixtures of linear low-density polyethylene with different molecular weights. The polymers were blended using a single-screw extruder, a twin-screw extruder, and a twin-screw mixer. The onset of flow instability changed depending on the mixing method used, even though their linear viscoelastic properties were almost identical. The mixtures that were subjected to mixing methods with weak mixing capability exhibit sharkskin failure even at low shear stress and low values of the maximum draw ratio without rupture in the molten state. The results suggested that mechanically weak points were present, which led to cohesive failure at the strand surface following abrupt stretching at the die exit (i.e., sharkskin failure). In contrast, the mixture that was subjected to thorough mixing exhibited smooth surface at high shear stress and a large maximum draw ratio.

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Section: Methodsmentioning

confidence: 99%

Impact of Mixing Method on Rheological Instability for Binary Mixture of Linear Low‐Density Polyethylene

et al. 2016

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“…Finally, Li et al revealed that the ionic interaction is responsible for the enhancement of melt strength, that is, the force required to stretch a molten polymer uniaxially at the non‐isothermal condition, for polypropylene . This phenomenon will be applicable because of strong demands in plastic industries …”

Section: Introductionmentioning

confidence: 99%

“…16 This phenomenon will be applicable because of strong demands in plastic industries. 17 Besides ionomers, solid (solvent-free) polymer electrolytes should be taken into consideration. Although most researches were performed using poly(ethylene oxide) and its copolymers in this field, in which Snyder et al reported the mechanical properties, 18 there have been a couple of researches on acrylate polymers.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic properties of poly(methyl methacrylate) with high glass transition temperature by lithium salt addition

Miyagawa

Ayerdurai

Nobukawa

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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The effect of ion‐dipole interaction between lithium cations and oxygen atoms in poly(methyl methacrylate) (PMMA), which leads to the great enhancement of glass transition temperature (Tg), on the linear viscoelastic properties is studied using binary blends of PMMA and lithium trifluoromethanesulfonate (LiCF3SO3). The strong interaction at low temperature leads to the high modulus in the glassy region even near Tg. The interaction becomes weak as increasing the temperature. Consequently, the rheological terminal region is clearly detected without a marked enhancement of steady‐state compliance, although the zero‐shear viscosity increases by the LiCF3SO3 addition. The result indicates that the crosslinking due to the ion‐dipole interaction has a lifetime that decides the longest relaxation time. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 2388–2394

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“…Such behavior was studied precisely by Wagner et al . and Seemork et al . Considering their research, we evaluated the drawdown force at two different draw ratios.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, a pronounced drawdown force is expected. However, there has been limited progress in studies of the influence of nucleating agents on drawdown force, with the exception of a few published reports …”

Section: Introductionmentioning

confidence: 99%

Enhancement of drawdown force in polypropylene containing nucleating agent

Phulkerd

Nakabayashi

Iwasaki

et al. 2018

J of Applied Polymer Sci

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The effect of the nucleation efficiency of three commercial nucleating agents, such as 1,3:2,4‐bis(3,4‐dimethylbenzylidene)sorbitol (DMDBS), sodium 2,2′‐methylene‐bis‐(4,6‐di‐tert‐butylphenyl)phosphate (SMBP), and magnesium silicate (talc), on the melt‐stretching performance of isotactic polypropylene (PP) is studied. It is found that the addition of 0.5 wt % of a nucleating agent enhances the crystallization temperature and that effect is pronounced for DMDBS and SMBP. Furthermore, DMDBS is more efficient than the other tested nucleating agents in enhancing the drawdown force, defined as a force required for stretching a molten strand. Nanofibers of DMDBS, which show significant alignment in the flow direction, are responsible for the rapid crystallization of PP in the flow field leading to an increase of drawdown force. The stretched strand shows a highly oriented structure in which the α‐form crystals orient to the flow direction. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47295.

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Effect of Die Geometry on Drawdown Force of Polypropylene at Capillary Extrusion

Cited by 20 publications

References 50 publications

Impact of Mixing Method on Rheological Instability for Binary Mixture of Linear Low‐Density Polyethylene

Impact of Mixing Method on Rheological Instability for Binary Mixture of Linear Low‐Density Polyethylene

Viscoelastic properties of poly(methyl methacrylate) with high glass transition temperature by lithium salt addition

Enhancement of drawdown force in polypropylene containing nucleating agent

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