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Abstract: Liquid
Crystalline Polymers (LCPs) provide favorable dielectric properties for extremely high
frequency (30 - 100 GHz) radio frequency device packaging and printed circuit board
substrates. This investigation sought to determine the cause of process-induced effects
in the dielectric constant between injection molded and cast film extruded LCP.
Processing LCPs creates through-thickness ... read morehierarchical structure, consisting of a core
and skin layer. Volume fraction of skin layer was determined to be responsible for the
difference in dielectric constant between injection molding and cast film extrusion.
Dielectric constant is a function of this volume fraction with a near linear
relationship. Is was discovered that dielectric constant can be predicted by fundamental
rule of mixtures, or adaptations from Lichtenecker, Maxwell-Garnett, and
Jayasundere-Smith. All studied models predicted dielectric constant of cast films (100 -
200 µm) and injection molded plaques (1.60 mm) within a margin of error of ± 2
and 4 %, respectively, against experimental
results.
Thesis (M.S.)--Tufts University,
2016.
Submitted to the Dept. of Mechanical
Engineering.
Advisors: Michael Zimmerman, and Anil
Saigal.
Committee: Michael Zimmerman, Anil Saigal,
and Meredith Dunbar.
Keywords: Mechanical
engineering, Polymer chemistry, and Electrical
engineering.read less
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