scholarly journals Correlations between the Shape of Viscosity Functions and the Molecular Structure of Long-Chain Branched Polyethylenes

2009 ◽  
Vol 294 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Florian J. Stadler ◽  
Helmut Münstedt
Keyword(s):  
Molecular Structure ◽  
Viscosity Functions ◽  
Long Chain

Thermorheological Behavior of Various Short- and Long-Chain Branched Polyethylenes and Their Correlations with the Molecular Structure

2010 ◽  
Vol 43 (17) ◽  
pp. 7341-7350 ◽  
Author(s):  
Ute Kessner ◽  
Joachim Kaschta ◽  
Florian J. Stadler ◽  
Cécile S. Le Duff ◽  
Xavier Drooghaag ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Thermorheological Behavior ◽  
Long Chain

Surface Film Thicknesses of Polymeric Substances in Relation to Molecular Structure

1946 ◽  
Vol 19 (3) ◽  
pp. 551-551
Author(s):  
Frederick T. Wall ◽  
Murray Zelikoff
Keyword(s):  
Molecular Structure ◽  
Fatty Acids ◽  
Surface Film ◽  
Molecular Structures ◽  
Cellulose Derivatives ◽  
Long Chain Fatty Acids ◽  
Monomolecular Films ◽  
Long Chain ◽  
Chain Fatty Acids

Abstract It is well known that certain compounds, such as long chain fatty acids, can form monomolecular films on water and that the areas of such films can be related to the dimensions of the molecules. Certain polymeric substances, including cellulose derivatives, proteins and the polymer of ω-hydroxydecanoic acid likewise form stable films whose areas can be conveniently measured. At this time we wish to report that we have prepared films of some rubberlike polymers as well, and that the results appear to give useful information about their molecular structures, particularly in relation to branching.

scholarly journals Relating Estrada index with spectral radius

2007 ◽  
Vol 72 (12) ◽  
pp. 1321-1327 ◽  
Author(s):  
Ivan Gutman ◽  
Slavko Radenkovic ◽  
Boris Furtula ◽  
Toufik Mansour ◽  
Matthias Schork
Keyword(s):  
Molecular Structure ◽  
Spectral Radius ◽  
Organic Molecules ◽  
Molecular Graph ◽  
3D Structure ◽  
Estrada Index ◽  
Basic Characteristics ◽  
Structure Descriptor ◽  
Long Chain

The Estrada index EE is a recently proposed molecular structure-descriptor, used in the modeling of certain features of the 3D structure of organic molecules, in particular of the degree of folding of proteins and other long-chain biopolymers. The Estrada index is computed from the spectrum of the molecular graph. Therefore, finding its relation with the spectral radius r (= the greatest graph eigenvalue) is of interest, especially because the structure-dependency of r is relatively well understood. In this work, the basic characteristics of the relation between EE and r, which turned out to be much more complicated than initially anticipated, was determined.

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