Effect of molecular weight distribution and branching on the viscosity of polyethylene melts

1962 ◽  
Vol 58 (166) ◽  
pp. 49-69 ◽  
Author(s):  
W. F. Busse ◽  
R. Longworth
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Polyethylene Melts

A Comparative Investigation of the Rheological Properties in Shear and Tension of Tube-Grade Polymodal Polyethylene Melts

2014 ◽  
Vol 41 (10) ◽  
pp. 31-34 ◽  
Author(s):  
V.N. Kuleznev ◽  
P.V. Surikov ◽  
V.D. Sevruk ◽  
T.A. Sineva
Keyword(s):  
Molecular Weight ◽  
Rheological Properties ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Comparative Investigation ◽  
High Durability ◽  
Polyethylene Melts ◽  
D 20 ◽  
Bimodal Polyethylene

Melts of bimodal (tube) polyethylenes relax considerably more rapidly than normal monomodal specimens. At exit from an l/d = 20 capillary, a melt of bimodal polyethylene behaves like an unrelaxed melt, whereas normal polyethylene does not manage to relax entirely even at exit from an l/d = 30 capillary. The obtained results point to one of the reasons for the high durability of polyethylene tubes with a bimodal molecular weight distribution.

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