Flexible and printable dielectric polymer composite with tunable permittivity and thermal stability

Lightweight and printable polymer dielectrics are ubiquitous in flexible hybrid electronics, exhibiting high breakdown strength and mechanical reliability. However, its advanced electronic applications are limited due to its relative low permittivity, compared to its ceramic counterparts. Here we report flexible all organic percolative nanocomposites that contain in-situ grown conductive polymer networks and dielectric polymer matrix, in which their dielectric properties can be designed and guided from the percolation theory. High dielectric constant of all organic percolative nanocomposite is shown over a broad frequency range under intensive bending cycles, while its thermal stability is attributed to thermal conductive two-dimensional montmorillonite nanosheets. The printable polymer composites with high dielectric performance and thermal stability would find broader interests in flexible hybrid electronics and radio frequency devices.