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Polymer Bulletin

, Volume 12, Issue 6, pp 557–563 | Cite as

A comparative study of the conformational mobility of octamethyltetrasiloxane and cyclododecane in the solid state

  • Detlef Emeis
  • Hans-Joachim Cantow
  • Martin Möller
Article

Abstract

A crystalline mesophase state in which molecules show conformational mobility is discussed for cyclododecane and octamethyltetrasiloxane.13C and29Si solid state NMR spectra show changes of the resonance signals which can be explained by changes of the conformation. The transition temperatures in the NMR spectra are correlated with the thermal transitions detected by DSC. Comparisons with the solution spectra give evidence that in case of octamethyltetrasiloxane, the conformational mobility is determined mainly by the molecular packing in the crystal, while packing effects are neglegibly small for cyclododecane. The data are discussed with concern to the corresponding linear chain molecules, i. e. poly(ethylene) and poly(dimethylsiloxane).

Keywords

Polymer Ethylene Solid State Transition Temperature Linear 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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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Detlef Emeis
    • 1
  • Hans-Joachim Cantow
    • 1
  • Martin Möller
    • 1
  1. 1.Institut für Makromolekulare Chemie der Universität Freiburg, Hermann-Staudinger-HausFreiburg i.Br.Germany

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