A comparative experimental study of the isothermal shear and uniaxial elongational rheological properties of low density, high density and linear low density polyethylenes

Minoshima, Wataru; White, James L.

doi:10.1016/0377-0257(86)80052-0

Cited by 32 publications

(12 citation statements)

References 33 publications

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“…This was in agreement with previous work by Ghaneh-Fard et al [9] who found that increasing the FLH increased the range of stable operating conditions. This was in disagreement with Minoshima and White [28] who suggested that increasing the FLH value decreased the range of stable operating conditions.…”

Section: Bubble Stabilitycontrasting

confidence: 53%

“…by inflating the bubble with a small amount of air, bubble instability was observed. The magnitude of the diameter fluctuations increased with time and eventually led to bubble breakage as reported by Minoshima and White [28]. A frost line height instability was observed for different operating conditions for PP.…”

Section: Bubble Stabilitymentioning

confidence: 59%

“…Furthermore, this was accompanied by a significant variation of film thickness, which was also found by Fleissner [4]. Minoshima and White [28] observed FLH instability by observing fluctuations in the bubble tension. FLH instability usually grew with time and then combined with helical instability and eventually caused the collapse of the bubble.…”

Section: Bubble Stabilitymentioning

confidence: 69%

See 2 more Smart Citations

Numerical modelling and experimental verification of blown film processing

Muke¹,

Connell²,

Sbarski³

et al. 2003

Journal of Non-Newtonian Fluid Mechanics

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Section: Bubble Stabilitycontrasting

confidence: 53%

Section: Bubble Stabilitymentioning

confidence: 59%

Section: Bubble Stabilitymentioning

confidence: 69%

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Numerical modelling and experimental verification of blown film processing

Muke¹,

Connell²,

Sbarski³

et al. 2003

Journal of Non-Newtonian Fluid Mechanics

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“…Minoshima and White investigated a series of LLDPEs, HDPEs and LDPEs in shear and uniaxial elongation, as well as in film blowing performance 4–5. Increasing long chain branching and, to a lesser degree, broadening the molecular weight distribution, seemed to enhance the bubble stability during tubular film blowing.…”

Section: Introductionmentioning

confidence: 99%

Elongational rheology of LLDPE / LDPE blends

Ajji

Sammut

Huneault

2003

J of Applied Polymer Sci

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ABSTRACT:The objective of this study is to investigate the effect of low density polyethylene (LDPE) content in linear low density polyethylene (LLDPE) on the crystallinity and strain hardening of LDPE / LLDPE blends. Three different linear low density polyethylenes (LL-1, LL-2 and LL-3) and low density polyethylenes (LD-1, LD-2 and LD-3) were investigated. Eight blends of LL-1 with 10, 20, 30 and 70 wt % of LD-1 and LD-3, respectively, were prepared using a single screw extruder. The elongational behavior of the blends and their constituents were measured at 150°C using an RME rheometer. For the blends of LL-1 with LD-1, the low shear rate viscosity indicated a synergistic effect over the whole range of concentrations, whereas for the blends of LL-1 with LD-3, a different behavior was observed. For the elongational viscosity behavior, no significant differences were observed for the strain hardening of the 10 -30% LDPE blends. Thermal analysis indicated that at concentrations up to 20%, LDPE does not significantly affect the melting and crystallization temperatures of LLDPE blends. In conclusion, the crystallinity and rheological results indicate that 10 -20% LDPE is sufficient to provide improved strain hardening in LLDPE.

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“…Due to their commercial importance, the rheological and processing behaviors of polyethylene have been widely studied. Among numerous investigations, those by White and Yamane [3], and by Minoshima and White [17,18] provide extensive information about the dependence of processing behaviors on the rheological characteristics. The melt spinning stability of polyethylene is shown to be dependent on the molecular weight, the molecular weight distribution, and the extent of long chain branching.…”

mentioning

confidence: 98%

An Experimental Study of a Bicomponent Coextrusion Fiber Spinning

Lee

Park

1994

International Polymer Processing

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The draw resonance instability in a concentric bicomponent coextrusion fiber spinning has been studied experimentally using a linear low density polyethylene (LLDPE) for the core and two low density polyethylenes (LDPE) for the skin-layer. These materials have been chosen to investigate a coextrusion flow in which each components have quite different extensional rheology. When they were spun individually, the LLDPE showed the draw resonance at a certain critical draw ratio whereas the LDPEs did not show the oscillatory instability. When the LLDPE and LDPE were spun together, the presence of the more viscoelastic LDPE layer delayed the onset of draw resonance of the LLDPE to a higher draw ratio. The degree of changes in the critical draw ratio was observed to be dependent on the rheological properties of the LDPEs. Although the experiments were conducted in a nonisothermal condition, various aspects of the experimental observations appeared to be in qualitative agreement with the predictions of isothermal linear theories. The present study is specifically for a coextrusion fiber spinning. Nevertheless, the observed trend of the instability should be also relevant to other coextrusion processes such as extrusion coating or film casting.

show abstract

A comparative experimental study of the isothermal shear and uniaxial elongational rheological properties of low density, high density and linear low density polyethylenes

Cited by 32 publications

References 33 publications

Numerical modelling and experimental verification of blown film processing

Numerical modelling and experimental verification of blown film processing

Elongational rheology of LLDPE / LDPE blends

An Experimental Study of a Bicomponent Coextrusion Fiber Spinning

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