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Structural Characterization of Ordered Phases in Hydrocarbon Dendrimers

Published online by Cambridge University Press:  15 February 2011

Christopher J. Buchko ,
Atisa Sioshansi ,
Zhifu Xu ,
Jeffrey S. Moore  and
David C. Martin
Christopher J. Buchko
Affiliation:
Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2136
Atisa Sioshansi
Affiliation:
Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2136
Zhifu Xu
Affiliation:
Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
Jeffrey S. Moore
Affiliation:
Department of Chemistry, Roger Adams Lab, University of illinois, Urbana, IL 61801
David C. Martin
Affiliation:
Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2136 Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, MI 48109
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Abstract

Structural characterization of phenylacetylene dendrimers (PADs) makes it possible to explore the relationship between molecular architecture and condensed phase organization. The size and geometry of the PAD series is precisely controlled, with phenylacetylene units emanating from a central phenylene in the manner of a tridendron. The branched molecule rapidly increases in size with each synthetic generation. The “shape-persistent” nature of the phenylacetylene molecule makes it ideal for use in the construction of self-assembling supramolecular systems.

Transmission electron microscopy (TEM) has been used to identify the crystal structure of lower generation PADs, and wide-angle X-ray studies confirm the decrease in crystallinity with size. Hot stage optical microscopy studies of thermal transitions reveal melting points for lower generation PADs, and an apparent glass transition for the amorphous higher generations. This type of structural information is essential to the rational design of self-assembling materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 413
Copyright
Copyright © Materials Research Society 1994

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References

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