scholarly journals Influence of the Molar Mass on Long-Chain Branching of Polypropylene

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 442 ◽  
Author(s):  
Florian Kamleitner ◽  
Bernadette Duscher ◽  
Thomas Koch ◽  
Simone Knaus ◽  
Klaus Schmid ◽  
...  
Keyword(s):  
Molar Mass ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

scholarly journals Rheological Measurements and Structural Analysis of Polymeric Materials

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1123
Author(s):  
Helmut Münstedt
Keyword(s):  
Molar Mass ◽  
Polymeric Materials ◽  
Acrylonitrile Butadiene Styrene ◽  
Zero Shear Viscosity ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Polymeric Systems ◽  
Rheological Measurements ◽  
Nanoparticle Dispersions ◽  
Long Chain

Rheological measurements of polymer melts are widely used for quality control and the optimization of processing. Another interesting field of rheology is to provide information about molecular parameters of polymers and the structure build-up in heterogeneous polymeric systems. This paper gives an overview of the influence of molar mass, molar mass distribution and long-chain branching on various rheological characteristics and describes the analytical power following from established relations. With respect to applications, we discuss how rheological measurements can be used to gain insight into the thermal stability of a material. A special impact lies in the demonstration, how long-chain branching can be analyzed using rheological means like the zero-shear viscosity as a function of molar mass and strain hardening occurring in elongation. For contributions to branching analysis, the thermorheological behavior and activation energies are particularly discussed. The use of elastic quantities in the case of mechanical pretreatment effects is briefly addressed. The influence of fillers on recoverable properties in the linear range of deformation is analyzed and the role of their specific surface area for interactions described. It is shown how the fundamental results can be applied to study the state of nanoparticle dispersions obtained under special conditions. Furthermore, it is demonstrated that the findings on polymer/filler systems are the base of structure analyses in heterogeneous polymeric materials like polyvinylchloride (PVC) and acrylonitrile–butadiene–styrene copolymers (ABS).

Influence of molar mass distribution and long-chain branching on strain hardening of low density polyethylene

2008 ◽  
Vol 48 (5) ◽  
pp. 479-490 ◽  
Author(s):  
Florian J. Stadler ◽  
Joachim Kaschta ◽  
Helmut Münstedt ◽  
Florian Becker ◽  
Michael Buback
Keyword(s):  
Strain Hardening ◽  
Mass Distribution ◽  
Molar Mass ◽  
Molar Mass Distribution ◽  
Low Density Polyethylene ◽  
Low Density ◽  
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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