Phasediagram, Superstructure and Properties of Poly (Diethylsiloxane), PDES

  • W. Pechhold
  • P. Schwarzenberger
Part of the NATO ASI Series book series (NSSB, volume 286)


In a first part the properties of PDES and its mesophase behavior are discussed and supplemented by some new volumetric and dynamic mechanical data. The dilatometric measurements indicate a small volume effect ΔV/V=0.004 during isotropization (m/i-transition) at normal pressure, which decreases with pressure and finally vanishes above 80 MPa. To check whether this transition persists at p>80 MPa and to determine the phasediagram of PDES, the improved shearquartz resonator method is described in a second part and successfully applied to measure the complex shear modulus G(p,T) of PDES. Finally the m/i-transition and its pressure dependence is quantitatively discussed.


Nematic Phase Quartz Resonator Complex Shear Modulus Shear Compliance Dilatometric Measurement 
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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • W. Pechhold
    • 1
  • P. Schwarzenberger
    • 1
  1. 1.Abteilung Angewandte PhysikUniversität UlmUlmGermany

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