This technology involves the development of multifunctional PVDF-based composite films incorporating two commercial alumina nanoparticle grades—SpectrAl® 81 and SpectrAl® 51—and recycled micronized ground tire rubber (GTR). The films are fabricated using a scalable solution-casting process in which PVDF and selected filler compositions are dispersed in N,N-dimethylacetamide (DMAc), homogenized using high-speed mixing, cast onto PTFE substrates, and thermally dried to produce freestanding composite films.
The composite architecture enables precise tuning of material properties depending on the ratio and type of fillers used. Alumina-rich formulations significantly enhance piezoelectric response, dielectric constant, thermal conductivity, and radiation attenuation compared to neat PVDF. SpectrAl® 81-based systems exhibit particularly strong dielectric polarization and radiation-shielding behavior, while SpectrAl® 51 formulations demonstrate improved electrical insulation and thermal-management performance. Ground tire rubber acts as a functional tuning component that modifies flexibility, damping behavior, and interfacial polarization effects.
The films demonstrate strong potential for flexible sensors, capacitive devices, thermal-management coatings, dielectric layers, lightweight shielding systems, and energy-harvesting applications. Certain compositions exhibit elevated electrical output under mechanical stimulation, enabling self-powered sensing capabilities, while others provide enhanced thermal conductivity and insulation performance desirable for electronics and battery systems. The integration of recycled GTR additionally supports sustainability goals by incorporating reclaimed elastomeric material into high-value advanced composites.
This technology is patent pending in the US and is available for licensing/partnering opportunities.