biostudies-literatureUnknown5(1)Singh MThe influence of high-intensity electric fields on the stability of polymeric materials is a problem of interest in the design of next-generation energy storage and electronic devices, and for understanding the limits of stability of polymer films exposed to large electric fields generally. Here, we show that the dielectric strength of entangled glassy polymer films increases as an inverse power-law of the film thickness <i>h</i> for "ultrathin" films below a micron in thickness. The dielectric strength enhancement in these polymer films becomes as large as ≈2 GV/m in films thinner than 100 nm, but in this thickness regime, the increase of the dielectric strength depends strongly on the polymer mass, sample aging time, and the method of film preparation. The enhancement of the dielectric bJACS Au121-135https://www.ebi.ac.uk/biostudies/studies/S-EPMC11775671biostudies-literatureAnomalously High Dielectric Strength and Capacitive Energy Density of Thin Entangled Glassy Polymer Films.PMC11775671Karim ASingh MTiwary SKNejat RDouglas JFfalseAnomalously High Dielectric Strength and Capacitive Energy Density of Thin Entangled Glassy Polymer Films.The influence of high-intensity electric fields on the stability of polymeric materials is a problem of interest in the design of next-generation energy storage and electronic devices, and for understanding the limits of stability of polymer films exposed to large electric fields generally. Here, we show that the dielectric strength of entangled glassy polymer films increases as an inverse power-law of the film thickness <i>h</i> for "ultrathin" films below a micron in thickness. The dielectric strength enhancement in these polymer films becomes as large as ≈2 GV/m in films thinner than 100 nm, but in this thickness regime, the increase of the dielectric strength depends strongly on the polymer mass, sample aging time, and the method of film preparation. The enhancement of the dielectric b2025-01-01T00:00:00Z2025 Jan2025-04-04T23:11:35.488Z2025-04-04T23:11:35.488ZS-EPMC117756713988657710.1021/jacsau.4c00833