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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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References

1Read, R.T. and Young, R.J., J. Mater. Sci. 19, 327 (1984).CrossRefGoogle Scholar
2Henkee, C. S., Thomas, E. L., and Fetters, L. J., J. Mater. Sci. 23, 1685 (1988).Google Scholar
3Martin, D. C., Berger, L. L., and Gardner, K. H., Macromolecules 24, 3921 (1991).Google Scholar
4Young, R.J. and Petermann, J., J. Polym. Sci., Polym. Phys. Ed. 20, 961 (1982).CrossRefGoogle Scholar
5Young, R. J. and Petermann, J., Makromol. Chem. 182, 621 (1981).CrossRefGoogle Scholar
6Young, R.J., Read, R.T., Bloor, D., and Ando, D.J., Discuss. Faraday Soc. 68, 509 (1979).Google Scholar
7and, P.H.J. YeungYoung, R.J., Polymer 27, 202 (1986).Google Scholar
8Hirth, J. P. and Lothe, J., Theory of Dislocations (McGraw-Hill, New York, 1968).Google Scholar
9Hankin, S. H. and Sandman, D. J., Macromolecules 24, 4983 (1991).CrossRefGoogle Scholar
10LeMoigne, J., Kajzar, F., and Thierry, A., Macromolecules 24, 2622 (1991).Google Scholar
11Enkelmann, V., Schleier, G., Wegner, G., Eichele, H., and Schwoerer, M., Chem. Phys. Lett. 52 (2), 314 (1977).CrossRefGoogle Scholar
12Apgar, P. A. and Yee, K. C., Acta Crystallogr. B34, 957 (1978).CrossRefGoogle Scholar
13Yee, K. C. and Chance, R. R., J. Polym. Sci., Polym. Phys. Ed. 16, 431 (1978).CrossRefGoogle Scholar
14Liao, J., private communication, March 1992.Google Scholar
15Martin, D. C., Ph.D. Dissertation, University of Massachusetts (1990).Google Scholar
16Cambridge Molecular Design, a Molecular Simulations company (1990).Google Scholar
17Courtney, T.H., Mechanical Behavior of Materials (McGraw-Hill, New York, 1990).Google Scholar
18Nabarro, F. R. N., Theory of Crystal Dislocations (Oxford University Press, 1967).Google Scholar
19Hone, D. and Singh, C., private communication, March 1992.Google Scholar
20Hone, D. and Singh, C., Bull. Am. Phys. Soc. 37 (1), 355 (1992).Google Scholar
21Gerasimov, G. N., Mol. Cryst. Liq. Cryst. 187, 215 (1990).Google Scholar
22Schermann, W., Wegner, G., Williams, J., and Thomas, J., J. Polym. Sci. 13, 753 (1975).Google Scholar