Orientation in networklike polymer systems. The role of extremum principles

H. G. Kilian, W. Knechtel, B. Heise, M. Zrinyi

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)

Abstract

Large deformations of network-like systems are discussed. Such systems are characterized by the existence of equivalent subsystems of deformation isotropically linked with each other, operating as smallest structural units the shape of which is changed according to the law of an affine transformation. For describing large deformations of such `colloid systems' it is significant that the extremum principles of thermodynamics can be extended so as to allow a discussion of constrained equilibrium states. This has the consequence that strain invariant system elements in network-like polymer systems like real networks, glasses, filled rubbers or semicrystalline polymer system-elements are oriented so as to maximize the orientation entropy. This allows a concise thermodynamic interpretation. It is for example clear that in any constrained equilibrium state the maximum entropy is necessarily accompanied by an energy minimum. If internal constrained equilibrium is realizable even within very short periods of time these extremum principles should strictly be fulfilled. On the global level network-like systems should display universal features while the molecular structure comes into play on local scales. How both are interrelated and how they depend on the conditions of constrained equilibrium is discussed on the basis of representative examples.

Original languageEnglish
Title of host publicationProgress in Colloid & Polymer Science
EditorsL. Myasnikova, V.A. Marikhin
PublisherPubl by Springer-Verlag GmbH & Company KG
Pages60-80
Number of pages21
Volume92
ISBN (Print)0387914536
Publication statusPublished - Dec 1 1993
EventProceedings of the 25th European Macromolecular Physics on Orientational Phenomena in Polymers - St. Petersburg, Russia
Duration: Jul 6 1992Jul 10 1992

Conference

ConferenceProceedings of the 25th European Macromolecular Physics on Orientational Phenomena in Polymers
CitySt. Petersburg, Russia
Period7/6/927/10/92

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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    Kilian, H. G., Knechtel, W., Heise, B., & Zrinyi, M. (1993). Orientation in networklike polymer systems. The role of extremum principles. In L. Myasnikova, & V. A. Marikhin (Eds.), Progress in Colloid & Polymer Science (Vol. 92, pp. 60-80). Publ by Springer-Verlag GmbH & Company KG.