Title page for ETD etd-06232009-063055

Type of Document Master's Thesis
Author Jackson, Mitchell L
URN etd-06232009-063055
Title The microwave frequency permittivity of thermoplastic composite materials
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Stern, Curtis H. Committee Chair
Kriz, Ronald D. Committee Member
Loos, Alfred C. Committee Member
  • Microwave heating
Date of Defense 1993-06-03
Availability restricted

Mixture models were studied in an effort to predict the microwave frequency permittivities of unidirectional-fiber-reinforced thermoplastic-matrix composite materials as a function of fiber volume fraction, fiber orientation relative to the electric field, and temperature. The permittivities of the constituent fiber and plastic materials were measured using a resonant cavity perturbation technique at 9.4 GHz and 2.45 GHz. The permittivities of the composite specimens were measured using a reflection cavity technique at 9.4 GHz and 2.45 GHz. Simple" rule of -mixtures II models that use the fiber and plastic permittivities have been found to approximate the complex dielectric properties of the composite for varied fiber volume fractions. The permittivities of oriented composites were successfully modeled at 9.4 GHz using a tensor rotation procedure. Composite permittivities were modeled with temperature up to the glass transition temperature of the thermoplastic matrix. Good agreement was found between the mixture model and experimental results for permittivity as a function of temperature at 9.4 GHz.

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