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Crystal growth and textured microstructures of 1,6-di(N-carbazolyl)-2,4 hexadiyne diacetylene

Published online by Cambridge University Press:  31 January 2011

Jun Liao  and
David C. Martin
Jun Liao
Affiliation:
Department of Materials Science and Engineering and the Macromolecular Science and Engineering Center, 2022 H. H. Dow Building, The University of Michigan, Ann Arbor, Michigan 48109-2136
David C. Martin*
Affiliation:
Department of Materials Science and Engineering and the Macromolecular Science and Engineering Center, 2022 H. H. Dow Building, The University of Michigan, Ann Arbor, Michigan 48109-2136
*
b)Author to whom correspondence should be addressed.
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Abstract

We are developing techniques to isolate and characterize grain boundary defects with controlled geometries in 1,6-di(N-carbazolyl)-2,4 hexadiyne (DCHD) diacetylene polymer bicrystals. To be successful in this endeavor, it is important to determine the influence of processing variables such as evaporation rate, solution concentration, and environment on DCHD diacetylene crystal morphology. We have found that large, high quality DCHD diacetylene single crystals can be grown from solution under a controlled atmosphere. The quality of the DCHD crystals can be evaluated by optical microscopy and quantitative digital image analysis. Defect structures in DCHD diacetylene crystals have been studied by transmission electron microscopy (TEM). Two single-crystal textured structures have been found in porous DCHD crystals precipitated from solution: (1) a microfibrillar structure and (2) a “cross-hatched” structure. The porous DCHD crystals show localized shear deformation zones (twins and kinks), but only in those regions where the density is greater than 95% that of the perfect crystal. Lateral chain invariant (LCI) small-angle grain boundaries have been identified in DCHD by HREM.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 11 , November 1996 , pp. 2921 - 2932
Copyright
Copyright © Materials Research Society 1996

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