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Dislocation mediated lattice bending in 1,6-di (N-carbazolyl)-2,4 hexadiyne (DCHD) polydiacetylene droplets

Published online by Cambridge University Press:  31 January 2011

Patricia M. Wilson  and
David C. Martin
Patricia M. Wilson
Affiliation:
Department of Materials Science and Engineering, The University of Michigan, H. H. Dow Building, Ann Arbor, Michigan 48109-2136
David C. Martin
Affiliation:
Department of Materials Science and Engineering, The University of Michigan, H. H. Dow Building, Ann Arbor, Michigan 48109-2136
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Abstract

Droplets of 1,6–di (N-carbazolyl)-2,4 hexadiyne (DCHD) polydiacetylene were prepared by room temperature evaporation of dilute (0.01 wt. %) solution of the monomer in chloroform onto amorphous carbon-coated mica substrates. High Resolution Electron Microscopy (HREM) and Selected Area Electron Diffraction (SAED) revealed small crystallographically textured droplets (∼1 μm diameter) with cracks parallel to the [001] chain direction. The droplet geometry allowed us to investigate the organization of the polymer near surfaces. It was found that the curvature of the droplet edge caused a local bending of the polymer crystal lattice. Direct imaging of the molecular structure near the droplet surface revealed that the mechanism of lattice bending was by the formation of edge dislocations. Dislocations were etched in some droplets to gain information about perturbations in structure and reactivity near the core.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 11 , November 1992 , pp. 3150 - 3158
Copyright
Copyright © Materials Research Society 1992

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