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Highly Ordered Dielectric Mirrors via the Self-Assembly of Dendronized Block Copolymers

Piunova, Victoria A. and Miyake, Garret M. and Daeffler, Christopher S. and Weitekamp, Raymond A. and Grubbs, Robert H. (2013) Highly Ordered Dielectric Mirrors via the Self-Assembly of Dendronized Block Copolymers. Journal of the American Chemical Society, 135 (41). pp. 15609-15616. ISSN 0002-7863. doi:10.1021/ja4081502.

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Dendronized block copolymers were synthesized by ruthenium-mediated ring-opening methathesis polymerization of exo-norbornene functionalized dendrimer monomers, and their self-assembly to dielectric mirrors was investigated. The rigid-rod main-chain conformation of these polymers drastically lowers the energetic barrier for reorganization, enabling their rapid self-assembly to long-range, highly ordered nanostructures. The high fidelity of these dielectric mirrors is attributed to the uniform polymer architecture achieved from the construction of discrete dendritic repeat units. These materials exhibit lightreflecting properties due to the multilayer architecture, presenting an attractive bottom-up approach to efficient dielectric mirrors with narrow band gaps. The wavelength of reflectance scales linearly with block-copolymer molecular weight, ranging from the ultraviolet, through the visible, to the near-infrared. This allows for the modulation of photonic properties through synthetic control of the polymer molecular weight. This work represents a significant advancement in closing the gap between the precision obtained from top-down and bottom-up approaches.

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Grubbs, Robert H.0000-0002-0057-7817
Additional Information:© 2013 American Chemical Society. Received: August 6, 2013. Published: October 4, 2013. We gratefully acknowledge Ron Synowicki and Nina Hong at J.A. Woollam Co., Inc. for their measurement and fitting of the refractive indices of these polymers. Reflection measurements were collected at the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology. This work was supported by a Dow-Resnick Bridge Award. This research was conducted with Government support under and awarded by DoD, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship (32 CFR 168a).
Group:Resnick Sustainability Institute
Funding AgencyGrant Number
Dow-Resnick Bridge AwardUNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) Fellowship32 CFR 168a
Issue or Number:41
Record Number:CaltechAUTHORS:20131009-162030103
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41844
Deposited By: Joy Painter
Deposited On:09 Oct 2013 23:47
Last Modified:10 Nov 2021 04:34

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