Abstract
The research on vibration damping of epoxy resins holds great potential, as it addresses
the ongoing risks posed by vibration environments to the maintainability and suitability
of materials in diverse applications. The addition of fillers emerges as a key method
to transform epoxy resin properties, offering potential benefitsts.
This research focused on zirconium tungstate, a ceramic powder with a negative
thermal expansion coefficient. It was meticulously added to three epoxy resins, each based
on a bisphenol A diglycidyl ether epoxy and three different amine hardeners. The zirconium
tungstate was introduced in varying percentages (0.1, 0.5, and 1 wt.%) to the epoxies,
and the effects on the epoxies' thermal expansion, glass transition, and vibration damping
properties were rigorously studied in both low-frequency and high-frequency domains, up to
2KHz.
The glass transition temperature of the epoxies showed a decreasing trend with increasing
filler percentage, which is a typical finding when adding fillers to epoxy resins. The
thermal expansion coefficient (CTE) provided interesting results. There are two CTEs for
the epoxy resins. One below and one above the glass transition (Tg), the CTE below Tg
highlight a suppression of the epoxies CTE, however above Tg, the CTE increased with
increasing filler content. Vibration damping in the low and high-frequency domains posed
new challenges initially through the use of time-temperature superposition supported by
Kramers-Kronig relations to validate the shift curves, which saw the shift factors relate to
the Williams-Landen-Ferry model. A high-frequency set-up was created to explore the epoxy
resin vibration responses up to 2KHz, in line with ASTM E756-05. The storage modulus
increased with increasing filler content at room temperature. Overall, this thesis explores
the relation of the zirconium tungstate filler to the epoxy resin focusing on the vibration
damping properties.