A parallel coextrusion technique for simultaneous measurements of radial die swell and velocity profiles of a polymer melt in a capillary rheometer

2004 ◽  
Vol 44 (10) ◽  
pp. 1960-1969 ◽  
Author(s):  
N.-T. Intawong ◽  
N. Sombatsompop
2019 ◽  
Vol 60 (3) ◽  
pp. 517-523 ◽  
Author(s):  
Sumanta Raha ◽  
Harindranath Sharma ◽  
M. Senthilmurugan ◽  
Sumanda Bandyopadhyay ◽  
Prasanta Mukhopadhyay

2018 ◽  
Vol 57 (42) ◽  
pp. 14106-14113 ◽  
Author(s):  
Alex M. Jordan ◽  
Patrick Lee ◽  
Christopher Thurber ◽  
Christopher W. Macosko

1970 ◽  
Vol 14 (2) ◽  
pp. 213-218 ◽  
Author(s):  
C. D. Han ◽  
M. Charles
Keyword(s):  

1965 ◽  
Vol 9 (2) ◽  
pp. 405-420 ◽  
Author(s):  
N. P. Cook ◽  
F. J. Furno ◽  
F. R. Eirich

2012 ◽  
Vol 550-553 ◽  
pp. 716-723
Author(s):  
Tofek Abddiem ◽  
Da Ming Wu ◽  
Jian Zhuang ◽  
Li Jun Hou ◽  
Ying Liu ◽  
...  

Compared with in the conventional scales, the rheological properties of polymer melts have changed in the micro-scales. Based on the principle of capillary flow and modified with the method of Bagley or zero die micro-die, the rheological characteristics of polypropylene (PP) were investigated using the HAAKE capillary rheometer under the micro-die and conventional die. The results show that: the viscosity of polymer melt modified with the method of bagley or zero die micro-die in the different L/D ratio of micro-die is the same and the shear viscosity of PP decreases with the increase of shear rate; Compared with the viscosity in the conventional scales, the measured viscosity of PP in the micro-scales was reduced by 46% in 0.25mm diameter die, 44% in the 0.20mm diameter die and 88% in the 0.15mm diameter die at the same shear rate; a layer of fixed polymer melt was found in the inwall of the micro-die through the calculation of wall slip rate.


Author(s):  
A. C. Reimschuessel ◽  
V. Kramer

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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