BNNT/polymer nanocomposites: themral/coating/structural/porous - Electric insulating themral conducting without signal interference for 5G (Low dielectric property), with polymeric properties such as flexibility, adhesion and low density, etc. - Thermal conductivity increase as high as 2~3 times with as low as 0.5 wt% BNNT addition into conventional thermal materials - Anti-corrosive, acid/chemical resistive, shock (vibration damping) absorbing coatings, etc.