  Syntactic foams are a promising candidate for applications in marine and oil
and gas industries in underwater cables and pipelines due to their excellent
insulation properties. The effective transmission of electrical energy through
cables requires insulation materials with a low loss factor and low dielectric
constant. Similarly, in transporting fluid through pipelines, thermal
insulation is crucial. However, both applications are susceptible to potential
environmental degradation from moisture exposure, which can significantly
impact the material's properties. This study addresses the knowledge gap by
examining the implications of prolonged moisture exposure on TPU and
TPU-derived syntactic foam via various multi-scale materials characterization
methods. The research focuses on a flexible syntactic foam created using
selective laser sintering and thermoplastic polyurethane elastomer (TPU)
reinforced with glass microballoons (GMB). The study specifically explores the
impact of moisture exposure duration and GMB volume fraction on microphase
morphological changes, their associated mechanisms, and their influence on
thermal transport and dielectric properties.
