Linear Rheological Properties of the Semifluorinated Copolymer Tetrafluoroethylene-Hexafluoropropylene-Vinylidenfluoride (THV) with Controlled Amounts of Long-Chain Branching

2007 ◽  
Vol 40 (7) ◽  
pp. 2409-2416 ◽  
Author(s):  
Jens Stange ◽  
Susanne Wächter ◽  
Helmut Münstedt ◽  
Harald Kaspar
Keyword(s):  
Rheological Properties ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

Molecular Theories for the Viscoelasticity of Flexible Homogeneous Polymeric Liquids

2007 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Molecular Weight ◽  
Rheological Properties ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Viscoelastic Behavior ◽  
Chain Branching ◽  
Molecular Parameters ◽  
Long Chain Branching ◽  
Polymeric Liquids ◽  
Long Chain

The fact that a polymer consists of a number of chains of different lengths, each in turn consisting of a series of monomer units, means that the motion of one part of the polymer chain will profoundly affect the motion of other parts. Hence, for a given polymer, a description of microscopic processes occurring under a given flow field depends on hypotheses regarding the molecular structure and mechanisms of flow in the polymer. Today, it is well-known, gained from practical experience, that the molecular weight, the molecular weight distribution, and the degree of long-chain branching influence the rheological properties of polymeric liquids. Therefore, a better understanding of the relationship between molecular parameters and rheological properties is very important from the standpoints of both polymer synthesis and polymer processing. However, the theoretical development of this aspect of the problem is far from complete, although some important progress has been made. In the preceding chapter, we discussed the viscoelastic behavior of polymeric liquids from the phenomenological point of view, without associating the significance of theoretical predictions to molecular origin(s). Specifically, we have seen that the rheological equations of state contain parameters that vary from polymer to polymer. Since it has amply been demonstrated by experiment that the extent of a particular viscoelastic behavior is greatly influenced by the molecular parameters, such as molecular weight, molecular weight distribution, and the degree of long-chain branching, predictions of any viscoelastic behavior of polymers on the basis of phenomenological theory is of very limited use to either control the quality of polymers produced or improve the performance of polymers, unless the parameters appearing in various continuum constitutive equations are related to molecular parameters.

Effect of long chain branching on rheological properties of metallocene polyethylene

Polymer ◽  
1999 ◽  
Vol 40 (7) ◽  
pp. 1737-1744 ◽  
Author(s):  
D. Yan ◽  
W.-J. Wang ◽  
S. Zhu
Keyword(s):  
Rheological Properties ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Metallocene Polyethylene ◽  
Long Chain

Long-Chain Branching and Rheological Properties of Ethylene-1-Hexene Copolymers Synthesized from Ethylene Stock by Concurrent Tandem Catalysis

2005 ◽  
Vol 206 (20) ◽  
pp. 2096-2105 ◽  
Author(s):  
Zhibin Ye ◽  
Fahad AlObaidi ◽  
Shiping Zhu ◽  
Ramesh Subramanian
Keyword(s):  
Rheological Properties ◽  
Tandem Catalysis ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

scholarly journals Complex interplay of short- and long-chain branching on thermal and rheological properties of ethylene/α-olefin copolymers made by metallocene catalysts with oscillating ligand structure

Polymer ◽  
2017 ◽  
Vol 112 ◽  
pp. 43-52 ◽  
Author(s):  
Mostafa Ahmadi ◽  
Faezeh Rezaei ◽  
Seyed Mohammad Mahdi Mortazavi ◽  
Mehdi Entezam ◽  
Florian J. Stadler
Keyword(s):  
Rheological Properties ◽  
Metallocene Catalysts ◽  
Complex Interplay ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Ligand Structure ◽  
Long Chain

Long chain branching and polydispersity effects on the rheological properties of polyethylenes

2000 ◽  
Vol 40 (11) ◽  
pp. 2279-2287 ◽  
Author(s):  
Savvas G. Hatzikiriakos
Keyword(s):  
Rheological Properties ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

Novel mechanism for the formation of long-chain branching in polyethylene

1998 ◽  
Vol 36 (16) ◽  
pp. 2889-2898 ◽  
Author(s):  
Mark K. Reinking ◽  
Gene Orf ◽  
Douglas McFaddin
Keyword(s):  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

Characterization of long chain branching: Dilution rheology of industrial polyethylenes

2002 ◽  
Vol 46 (2) ◽  
pp. 401-426 ◽  
Author(s):  
B. J. Crosby ◽  
M. Mangnus ◽  
W. de Groot ◽  
R. Daniels ◽  
T. C. B. McLeish
Keyword(s):  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

Character of long-chain branching in highly purified natural rubber

2010 ◽  
Vol 115 (6) ◽  
pp. 3645-3650 ◽  
Author(s):  
Sureerut Amnuaypornsri ◽  
Lucksanaporn Tarachiwin ◽  
Jitladda T. Sakdapipanich
Keyword(s):  
Natural Rubber ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

The effect of long chain branching on the processability of polypropylene in thermoforming

2004 ◽  
Vol 44 (5) ◽  
pp. 973-982 ◽  
Author(s):  
A. D. Gotsis ◽  
B. L. F. Zeevenhoven ◽  
A. H. Hogt
Keyword(s):  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain
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