CRYSTAL-STRUCTURES OF POLY-PARAPHENYLENE OLIGOMERS CONTAINING PENDANT PHENYL GROUPS

被引:9
作者
BAKER, KN
FRATINI, AV
ADAMS, WW
机构
[1] WRIGHT RES & DEV CTR,POLYMER BRANCH,MAT LAB,WRIGHT PATTERSON AFB,OH 45433
[2] UNIV DAYTON,DEPT CHEM,DAYTON,OH 45469
关键词
conducting polymers; crystal structure; poly-p-phenylenes; polyphenyls; rigid-rod polymers;
D O I
10.1016/0032-3861(90)90178-2
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The room temperature crystal structures of 1,2,4-triphenylbenzene (TPB), C24H18; 22,45-diphenyl-p-quinquephenyl (DPQ), C42H30; and 22,65-diphenyl-p-septiphenyl (DPS), C54H38, 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. © 1990.
引用
收藏
页码:1623 / 1631
页数:9
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