Improved Elastomers through Control of Network Chain-Length Distributions

  • J. E. Mark

Abstract

The effect of network chain-length distribution,1,2 is one aspect of rubberlike elasticity that has not been studied very much until recently, because of two primary reasons. On the experimental side, the cross-linking techniques traditionally used to prepare the network structures required for rubberlike elasticity have been random, uncontrolled processes.1–3 Examples are vulcanization (addition of sulfur), peroxide thermolysis (free-radical couplings), and high-energy radiation (free-radical and ionic reactions). All of these techniques are random in the sense that the number of cross links thus introduced is not known directly, and two units close together in space are joined irrespective of their locations along the chain trajectories. The resulting network chain-length distribution is unimodal and probably very broad. On the theoretical side, it has turned out to be convenient, and even necessary, to assume a distribution of chain lengths that is not only unimodal, but monodisperse!2,3

Keywords

Short Chain Network Chain Biaxial Extension PDMS Elastomer PDMS Chain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer Science+Business Media New York 1998

Authors and Affiliations

  • J. E. Mark
    • 1
  1. 1.Department of ChemistryUniversity of CincinnatiCincinnatiUSA

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