Effects of molecular weight distribution and branching on rheological parameters of polyethylene melts. Part I. Unfractionated polymers

1965 ◽  
Vol 9 (2) ◽  
pp. 757-765 ◽  
Author(s):  
J. E. Guillet ◽  
R. L. Combs ◽  
D. F. Slonaker ◽  
D. A. Weemes ◽  
H. W. Coover
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Rheological Parameters ◽  
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.

scholarly journals Evaluación del efecto rejuvenecedor de bio-materiales sobre ligantes para mezclas con alto contenido de asfalto recuperado

2017 ◽  
Vol 7 (080) ◽  
pp. 130 ◽  
Author(s):  
A. Jiménez del Barco-Carrión ◽  
M. Pérez-Martínez ◽  
A. Themeli ◽  
D. Lo Presti ◽  
P. Marsac ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Natural Resources ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Apparent Molecular Weight ◽  
Rheological Parameters ◽  
Environmental Concerns ◽  
Reclaimed Asphalt ◽  
Pavement Engineering

The interest in using bio-materials in pavement engineering has grown significantly over the last decades due to environmental concerns about the use of non-recoverable natural resources. In this paper, bio-materials are used together with Reclaimed Asphalt (RA) to restore some of the properties of the aged bitumen present in mixtures with high RA content. For this purpose, two bio-materials are studied and compared to conventional and polymer modified bitumens. Blends of these materials with RA bitumen were produced and studied to simulate a 50% RA mixture. The rejuvenating effect of the two bio-materials on RA has been assessed and compared with the effect of the conventional binders. Apparent Molecular Weight Distribution of the samples (obtained by the ?-method) and different rheological parameters were used for this purpose. Results revealed the power of bio-materials to rejuvenate RA bitumen, showing their capability to be used as fresh binders in high-RA content mixtures.

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