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This content will become publicly available on March 4, 2017

Title: Directed self-assembly of block copolymers for high breakdown strength polymer film capacitors

Emerging needs for fast charge/discharge yet high-power, lightweight, and flexible electronics requires the use of polymer-film-based solid-state capacitors with high energy densities. Fast charge/discharge rates of film capacitors on the order of microseconds are not achievable with slower charging conventional batteries, supercapacitors and related hybrid technologies. However, the current energy densities of polymer film capacitors fall short of rising demand, and could be significantly enhanced by increasing the breakdown strength (EBD) and dielectric permittivity (εr) of the polymer films. Co-extruded two-homopolymer component multilayered films have demonstrated much promise in this regard showing higher EBD over that of component polymers. Multilayered films can also help incorporate functional features besides energy storage, such as enhanced optical, mechanical, thermal and barrier properties. In this work, we report accomplishing multilayer, multicomponent block copolymer dielectric films (BCDF) with soft-shear driven highly oriented self-assembled lamellar diblock copolymers (BCP) as a novel application of this important class of self-assembling materials. Results of a model PS-b-PMMA system show ~50% enhancement in EBD of self-assembled multilayer lamellar BCP films compared to unordered as-cast films, indicating that the breakdown is highly sensitive to the nanostructure of the BCP. The enhancement in EBD is attributed to the “barrier effect”, where themore » multiple interfaces between the lamellae block components act as barriers to the dielectric breakdown through the film. The increase in EBD corresponds to more than doubling the energy storage capacity using a straightforward directed self-assembly strategy. Lastly, this approach opens a new nanomaterial paradigm for designing high energy density dielectric materials.« less
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [4] ;  [2] ;  [5] ;  [1]
  1. Univ. of Akron, Akron, OH (United States)
  2. Wright Patterson Air Force Base, Dayton, OH (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States)
  5. Howard Univ., Washington, D.C. (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1944-8244; R&D Project: 16075; 16075; KC0403020
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 8; Journal Issue: 12; Journal ID: ISSN 1944-8244
American Chemical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY self-assembly; Center for Functional Nanomaterials; barrier effect; block copolymer; breakdown strength; capacitor; cold zone annealing−soft shear; dielectric; directed self-assembly; lamellae