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Manfred Wagner
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Manfred Hermann Wagner (born 1948) is the author of Wagner model
Wagner model
Wagner model is a rheological model developed for the prediction of the viscoelastic properties of polymers. It might be considered as a simplified practical form of the Bernstein-Kearsley-Zapas model...

 and the molecular stress function theory for polymer
Polymer
A polymer is a large molecule composed of repeating structural units. These subunits are typically connected by covalent chemical bonds...

 rheology.
He is a Professor for Polymer engineering and Polymer physics
Polymer physics
Polymer physics is the field of physics that studies polymers, their fluctuations, mechanical properties, as well as the kinetics of reactions involving degradation and polymerisation of polymers and monomers respectively....

 at the Technical University of Berlin
Technical University of Berlin
The Technische Universität Berlin is a research university located in Berlin, Germany. Translating the name into English is discouraged by the university, however paraphrasing as Berlin Institute of Technology is recommended by the university if necessary .The TU Berlin was founded...

.

Manfred was born in Stuttgart
Stuttgart
Stuttgart is the capital of the state of Baden-Württemberg in southern Germany. The sixth-largest city in Germany, Stuttgart has a population of 600,038 while the metropolitan area has a population of 5.3 million ....

, Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 in 1948. He obtained his PhD in Chemical engineering
Chemical engineering
Chemical engineering is the branch of engineering that deals with physical science , and life sciences with mathematics and economics, to the process of converting raw materials or chemicals into more useful or valuable forms...

 at the Institute for Polymer Processing of Stuttgart University. He worked as a post-doc in Polymer Physics under Joachim Meissner at the Eidgenössische Technische Hochschule
ETH Zurich
The Swiss Federal Institute of Technology Zurich or ETH Zürich is an engineering, science, technology, mathematics and management university in the City of Zurich, Switzerland....

 in Zurich
Zürich
Zurich is the largest city in Switzerland and the capital of the canton of Zurich. It is located in central Switzerland at the northwestern tip of Lake Zurich...

, and in the Plastic
Plastic
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce production costs...

 industry, then he returned to Stuttgart University in 1988 as Professor for Fluid Dynamics and Rheology. In 1998-1999, he was Dean of the Faculty of Chemical Engineering and Engineering Cybernetics of Stuttgart University. In 1999, he moved to Technical University of Berlin.

His works include the constitutive equation
Constitutive equation
In physics, a constitutive equation is a relation between two physical quantities that is specific to a material or substance, and approximates the response of that material to external forces...

s for polymer melts, the application of rheology to the processing of polymers, and structure-property relationships for polymers. The focus of his work on rheology
Rheology
Rheology is the study of the flow of matter, primarily in the liquid state, but also as 'soft solids' or solids under conditions in which they respond with plastic flow rather than deforming elastically in response to an applied force....

 is the field of non-linear shear and elongational behavior of polymer
Polymer
A polymer is a large molecule composed of repeating structural units. These subunits are typically connected by covalent chemical bonds...

 melts and effects of polydispersity, branching and blending on melt behavior. The outstanding point associated with Wagner's work is the relative simplicity of the structural picture of the polymer chain and its respective mathematical formulation.

His latest contribution to the constitutive modeling, the MSF (Molecular Stress Function) theory, assumes a microstructure-based damping function (developed by himself in the late 1970s) that modifies the tube model of Doi and Edwards by considering the tube diameter to change with deformation. This assumption overcomes the most important disadvantage of the DE theory and produces excellent predictions consistent with the picture of the polymer chain.

He has published to date over 100 scientific papers. In 1981, he received the annual award of the British Society of Rheology . The Institute of Materials, London
London
London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, awarded him the Swinburne Award 2002.

Wagner was the President of the German Society of Rheology 1991-2003, and he is Secretary of the European Society of Rheology since 1996.

Until 2008 Wagner and Rolon-Garrido are studying the constitutive equations model to improve the rheology model at Polymertechnik/Polymerphysik at the TU-Berlin.
Other rheological projects as polymer/additive interactions are being studied by Wagner and Marco Müller.

External links


Selected papers

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