Dielectric analysis of thermoset cure

  • Stephen D. Senturia
  • Norman F. SheppardJr.
Conference paper
Part of the Advances in Polymer Science book series (POLYMER, volume 80)


All dielectric measurements involve the determination of the electrical polarization and conduction properties of a sample subjected to a time-varying electric field. Section 2 addresses dielectric measurement methods, the various instruments and electrodes, and their calibrations. Section 3 examines the microscopic mechanisms giving rise in the observed microscopic dielectric properties, and Section 4 explores in detail the effects of temperature and cure on these properties. Finally, Section 5 contains a selected bibliography of applications of dielectric analysis to the study of thermoset cure.


Dielectric Property Loss Factor Electrode Polarization Epoxy Cure Relaxation Time Distribution 
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.



extent of conversion


distribution parameter

tan δ

bulk material loss tangent

tan δx

experimental loss tangent (equivalent to D)


permittivity of free space, 8.85×10−14 F/cm


relaxed permittivity (relative to ε0)


unrelaxed permittivity (relative to ε0, equivalent to ε)


bulk permittivity (relative to ε0)


experimental permittivity (relative to ε0)


dipole contribution to the relative permittivity


infinite-frequency relative permittivity (equivalent to εu)


bulk loss factor (relative to ε0)


experimental loss factor (relative to ε0)




dipole moment


resistivity (equivalent to 1/σ)


conductivity (equivalent to 1/ϱ)


dipole relaxation time


phase difference between voltage and current


angular frequency




area of parallel plate electrodes


equivalent circuit representation of bulk sample capacitance


blocking-layer capacitance


capacitance of microdielectrometer floating gate


experimentally measured sample capacitance


constant in Williams-Landel-Ferry (WLF) equation


constant in Williams-Landel-Ferry (WLF) equation


dissipation factor (equivalent to tan δx)


microdielectrometer transfer function


time-varying current


complex amplitude of i(t)


spacing of parallel plate electrodes


concentration of ith ion


charge of ith ion


time-varying charge


radius of ith ion


equivalent circuit representation of bulk sample resistance


experimentally measured sample resistance


blocking-layer thickness


glass transition temperature


mobility of ith ion


time-varying voltage


complex amplitude of v(t)


experimentally measured admittance


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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • Stephen D. Senturia
    • 1
  • Norman F. SheppardJr.
    • 1
  1. 1.Massachusetts Institute of TechnologyCambridgeUSA

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