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

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

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.

A Study on Polymer Particle Flow in a Disk Zone of a Screw-Disk Extruder

2014 ◽  
Vol 35 (1) ◽  
pp. 121-135 ◽  
Author(s):  
Tomasz Rydzkowski ◽  
Iwona Michalska-Pożoga
Keyword(s):  
Mechanical Properties ◽  
Computer Simulations ◽  
Particle Motion ◽  
Polymer Melt ◽  
Experimental Tests ◽  
Polymer Particle ◽  
Particle Flow ◽  
Material Particle ◽  
Motion Trajectories ◽  
Stretching Effect

Abstract The paper presents the summary of research on polymer melt particle motion trajectories in a disc zone of a screw-disk extruder. We analysed two models of its structure, different in levels of taken simplifications. The analysis includes computer simulations of material particle flow and results of experimental tests to determine the properties of the resultant extrudate. Analysis of the results shows that the motion of melt in the disk zone of a screw-disk extruder is a superposition of pressure and dragged streams. The observed trajectories of polymer particles and relations of mechanical properties and elongation of the molecular chain proved the presence of a stretching effect on polymer molecular chains.

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