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Lattice Bending in Poly(Diacetylene) Droplets Near Surfaces

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Abstract

Droplets of l, 6-di(N-carbazolyl)-2, 4 hexadiyne (DCHD) diacetylene were prepared by room temperature evaporation of dilute (0.01 wt %) solution of the monomer in chloroform on amorphous carbon-coated mica substrates. HREM and SAED examination revealed small crystallographically textured droplets (:_1 fum diameter) with cracks parallel to the [001] chain direction. The droplet geometry allowed us to investigate the structure of the polymer near edges both parallel and perpendicular to the chain axis. It was found that the curvature of the droplet edge caused a local bending of the polymer crystal lattice. The direct imaging of the molecular organization near the droplet surface allowed an investigation of the mechanisms of lattice bending via the formation of edge dislocations. An understanding of these defects is important in determining how they relate to the optical properties of poly(diacetylenes).

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Acknowledgement

DCM would like to thank the University of Michigan College of Engineering, the Michigan Memorial Phoenix Project, and the NSF Division of Materials Research DMR-9024876. PMW would like to thank the Air Force for a graduate fellowship and the Electron Microbeam Analysis Laboratory (EMAL) for their assistance. We would also like to thank Prof. Jeff Moore of the University of Michigan Chemistry Department for help in preparing the DCHD monomer samples.

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Authors and Affiliations

  1. The University of Michigan, Materials Science and Engineering, H.H. Dow Building, Ann Arbor, MI, 48109s-2136, USA

    Patricia M. Wilson & David C. Martin

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  1. Patricia M. Wilson
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  2. David C. Martin
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Wilson, P.M., Martin, D.C. Lattice Bending in Poly(Diacetylene) Droplets Near Surfaces. MRS Online Proceedings Library 247, 123–128 (1992). https://doi.org/10.1557/PROC-247-123

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  • DOI: https://doi.org/10.1557/PROC-247-123

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