Effect of Die Entry Geometry on Polymer Melt Fracture and Extrudate Distortion

1961 ◽  
Vol 5 (1) ◽  
pp. 341-353 ◽  
Author(s):  
E. B. Bagley ◽  
H. P. Schreiber
Keyword(s):  
Polymer Melt ◽  
Melt Fracture ◽  
Extrudate Distortion

Polymer Melt Fracture

2010 ◽  
Author(s):  
Rudy Koopmans ◽  
Jaap Den Doelder ◽  
Jaap Molenaar
Keyword(s):  
Polymer Melt ◽  
Melt Fracture

Hooke's Law in Shear and Polymer Melt Fracture

1960 ◽  
Vol 31 (6) ◽  
pp. 1126-1127 ◽  
Author(s):  
E. B. Bagley
Keyword(s):  
Polymer Melt ◽  
Melt Fracture ◽  
Hooke’S Law ◽  
Hooke's Law

scholarly journals Experimental Evidence for an Intrinsic Route to Polymer Melt Fracture Phenomena: A Nonlinear Instability of Viscoelastic Poiseuille Flow

2003 ◽  
Vol 90 (11) ◽  
Author(s):  
Volfango Bertola ◽  
Bernard Meulenbroek ◽  
Christian Wagner ◽  
Cornelis Storm ◽  
Alexander Morozov ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Poiseuille Flow ◽  
Polymer Melt ◽  
Nonlinear Instability ◽  
Melt Fracture

Critcal stress and recoverable shear for polymer melt fracture

1972 ◽  
Vol 12 (3) ◽  
pp. 184-192 ◽  
Author(s):  
J. Vlachopoulos ◽  
M. Alam
Keyword(s):  
Polymer Melt ◽  
Melt Fracture

Factors Affecting the Extrudate Swell and Melt Fracture Phenomena of Rubber Compounds

1981 ◽  
Vol 54 (5) ◽  
pp. 905-929 ◽  
Author(s):  
Jean L. Leblanc
Keyword(s):  
Extrusion Process ◽  
Critical Conditions ◽  
Molecular Characteristics ◽  
Melt Fracture ◽  
Extrudate Swell ◽  
Cumulative Energy ◽  
Factors Affecting ◽  
Elastomeric Materials ◽  
Level 3 ◽  
Extrudate Distortion

Abstract Post-extrusion swelling and extrudate distortion phenomena reveal the viscoelastic nature of elastomeric materials and are particularly critical in rubber processing. With the short dies used in the rubber industry, it is clear that extrudate swell depends not only on the rheological properties of the compounds, but also on the particular geometry of the extrusion system. Consequently, it is very difficult to compare laboratory results with the experience of industrial practice, because of the number and variety of extrusion processes. However, it is possible to draw some generally valid conclusions from the data currently available. The main factors affecting post-extrusion swelling and the critical conditions for the onset of extrudate distortion are: (1) the elastomer, its nature and molecular characteristics; (2) the filler, its grade and level; (3) the (cumulative) energy introduced into the rubber during the mixing operations; (4) the mixing procedure (particularly in blend preparation); (5) the temperature and shear conditions of the extrusion process. The use of sophisticated test instruments, such as the MPT enables the processability parameters of a compound to be rapidly obtained, which can often be used as a key to solve practical plant problems.

Polymer Morphology Revealed by Staining Techniques

1981 ◽  
Vol 39 ◽  
pp. 340-341
Author(s):  
A. C. Reimschuessel ◽  
V. Kramer
Keyword(s):  
Polymer Melt ◽  
Nylon 6 ◽  
Morphological Features ◽  
Negative Staining ◽  
Polymer Morphology ◽  
Crystallizable Polymer ◽  
Staining Techniques ◽  
Long Chain

Staining techniques can be used for either the identification of different polymers or for the differentiation of specific morphological domains within a given polymer. To reveal morphological features in nylon 6, we choose a technique based upon diffusion of the staining agent into accessible regions of the polymer.When a crystallizable polymer - such as nylon 6 - is cooled from the melt, lamellae form by chainfolding of the crystallizing long chain macromolecules. The regions between adjacent lamellae represent the less ordered amorphous domains into which stain can diffuse. In this process the lamellae will be “outlined” by the dense stain, giving rise to contrast comparable to that obtained by “negative” staining techniques.If the cooling of the polymer melt proceeds relatively slowly - as in molding operations - the lamellae are usually arranged in a radial manner. This morphology is referred to as spherulitic.

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