Feasibility Study to Evaluate Candidate Materials of Nanofilled Block Copolymers for Use in Ultra High Density Pulsed Power Capacitors
Abstract
Composite dielectrics offer opportunities to combine the high permittivity of inorganic fillers with the high breakdoen strength (Ebd) of polymer matrix to obtain high energy density capacitors. Our strategy of grafting block copolymer (BCP) to nanoparticles (BCP-g-NPs) to chemically match the corona of NPs with BCP matrix has resulted in a highly dispersed BCP system without compromising the original order of BCP. We performed relative permittivity measurements of Bcp-g-NP filled BCP composite and showed enhancement over unfilled bcp on aluminum coated quartz substrate. We successfully demonstrated a novel approach to multilayered electrostatic capacitor films showing the first-ever application of self-assembling BCPs as the nanostructured dielectric media in electrostatic capacitors. Using controlled ordering of lamellae forming BCPs via cold zone annealing soft-shear strategy of directed self-assembly, highly ordered lamellar architectures were obtained in micron thick BCP films, yielding up to a ~50% increase in Ebd compared to as-cast BCP films. Since energy storage density has a quadratic dependence on the EBD, significant enhancement in energy density was achieved by using nanostructured BCPs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 26, 2015
- Accession Number
- AD1000741
Entities
People
- Dharmaraj Raghavan
Organizations
- Howard University