ISSN:
0887-624X
Keywords:
alternating
;
copolyimide
;
tetrahydro[5]helicene
;
[5]helicene
;
solubility
;
molecular modeling
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A series of novel copolyimides have been synthesized from three commercially available dianhydrides and two diamine monomers containing the tetrahydro[5]helicene unit. Some of the copolyimides were soluble in common organic solvents such as 1,1,2,2-tetrachloroethane, N,N-dimethylacetamide, and N-methyl-2-pyrrolidinone. Molecular modeling was used to explain the enhanced solubility of the presented polyimides, based on structural features of the tetrahydro[5]helicene monomeric units. The onset temperatures for 5% weight loss for these polyimides, as assessed by thermogravimetry, were above 430°C in nitrogen. Inherent viscosities of the obtained polyimides were above 0.36 dL/g. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1349-1353, 1998
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
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