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Crystal structures of poly-paraphenylene oligomers containing pendant phenyl groups
The room temperature crystal structures of 1,2,4-triphenylbenzene (TPB), C 24H 18; 2 2,4 5-diphenyl- p-quinquephenyl (DPQ), C 42H 30; and 2 2,6 5-diphenyl- p-septiphenyl (DPS), C 54H 38, have been investigated as part of a research programme in rigid-rod polymers, materials which are of great intere...
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Published in: | Polymer (Guilford) 1990-09, Vol.31 (9), p.1623-1631 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The room temperature crystal structures of 1,2,4-triphenylbenzene (TPB), C
24H
18; 2
2,4
5-diphenyl-
p-quinquephenyl (DPQ), C
42H
30; and 2
2,6
5-diphenyl-
p-septiphenyl (DPS), C
54H
38, have been investigated as part of a research programme in rigid-rod polymers, materials which are of great interest for aerospace and electro-optical applications. The molecules are non-planar, in contrast to the planar structures found at room temperature for the unsubstituted polyphenyls. The oligomer axis does not align with any of the crystallographic axes. The pendant-oligomer bond, however, does align with the longest crystallographic axis. The pendant torsion angle is greater than 45° and increases with increasing chain length. Knowledge of molecular structure and crystal packing of oligomeric model compounds will be useful in further calculations of mechanical, optical, and electro-optical properties for the corresponding rigid-rod polymer structures. |
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ISSN: | 0032-3861 1873-2291 |
DOI: | 10.1016/0032-3861(90)90178-2 |