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Experimental investigations of the influence of molecular weight distribution on melt spinning and extrudate swell characteristics of polypropylene
Wataru Minoshima,
James L. White,
Joseph E. Spruiell,
Wataru Minoshima
Polymer Engineering, The University of Tennessee, Knoxville, Tennessee 37916
Search for more papers by this authorJames L. White
Polymer Engineering, The University of Tennessee, Knoxville, Tennessee 37916
Search for more papers by this authorJoseph E. Spruiell
Polymer Engineering, The University of Tennessee, Knoxville, Tennessee 37916
Search for more papers by this authorWataru Minoshima,
James L. White,
Joseph E. Spruiell,
Wataru Minoshima
Polymer Engineering, The University of Tennessee, Knoxville, Tennessee 37916
Search for more papers by this authorJames L. White
Polymer Engineering, The University of Tennessee, Knoxville, Tennessee 37916
Search for more papers by this authorJoseph E. Spruiell
Polymer Engineering, The University of Tennessee, Knoxville, Tennessee 37916
Search for more papers by this authorAbstract
An experimental study of the influence of molecular weight distribution on the melt spinning and extrudate swell of a series of polypropylenes of varying molecular weight and distribution is reported. Emphasis is given to effects of variations of molecular weight distribution. Narrowing the molecular distribution increases the slope of the elongational viscosity–elongation rate curve, stabilizes the spinline relative to both random disturbances and draw resonance, and decreases both instantaneous and delayed extrudate swell. These results are interpreted in terms of viscoelastic fluid mechanics and earlier experimental studies by the authors of the influence of molecular weight distribution on rheological properties. The influences of these rheological factors on spinline structure development is discussed.
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