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Rapid self-assembly of brush block copolymers to photonic crystals.

ABSTRACT: The reduced chain entanglement of brush polymers over their linear analogs drastically lowers the energetic barriers to reorganization. In this report, we demonstrate the rapid self-assembly of brush block copolymers to nanostructures with photonic bandgaps spanning the entire visible spectrum, from ultraviolet (UV) to near infrared (NIR). Linear relationships were observed between the peak wavelengths of reflection and polymer molecular weights. This work enables "bottom-up" fabrication of photonic crystals with application-tailored bandgaps, through synthetic control of the polymer molecular weight and the method of self-assembly. These polymers could be developed into NIR-reflective paints, to combat the "urban heat island effect" due to NIR photon thermalization.

SUBMITTER: Sveinbjornsson BR

PROVIDER: S-EPMC3437898 | biostudies-other | 2012 Sep

REPOSITORIES: biostudies-other

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Rapid self-assembly of brush block copolymers to photonic crystals.

Sveinbjörnsson Benjamin R BR Weitekamp Raymond A RA Miyake Garret M GM Xia Yan Y Atwater Harry A HA Grubbs Robert H RH

Proceedings of the National Academy of Sciences of the United States of America 20120821 36

The reduced chain entanglement of brush polymers over their linear analogs drastically lowers the energetic barriers to reorganization. In this report, we demonstrate the rapid self-assembly of brush block copolymers to nanostructures with photonic bandgaps spanning the entire visible spectrum, from ultraviolet (UV) to near infrared (NIR). Linear relationships were observed between the peak wavelengths of reflection and polymer molecular weights. This work enables "bottom-up" fabrication of phot ...[more]

PMID: 22912408

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