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Chain Conformations Of Aromatic Polvimides And Their Ordering In Thin Films.

Published online by Cambridge University Press:  15 February 2011

D. Y. Yoon
Affiliation:
IBM Almaden Research Center, 650 IIarry Road, San Jose, California 95120
W. Parrish
Affiliation:
IBM Almaden Research Center, 650 IIarry Road, San Jose, California 95120
L. E. Depero
Affiliation:
IBM Almaden Research Center, 650 IIarry Road, San Jose, California 95120
M. Ree
Affiliation:
IBM Almaden Research Center, 650 IIarry Road, San Jose, California 95120
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Abstract

We have investigated the conformation – order relationships of four aromatic polyimides prepared by thermal imidization of the precursor poly(amic acids) in thin films. They are: (i) PMDA-4,4′-ODA polyimide from pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) monomers; (ii) PMDA-PDA polyimide from PMDA and p-phenylene diamine (PDA); (iii) PMDA-Benzidine polyimide from PMDA and benzidine and (iv) BPDA-PDA polyirnide from biphenylene tetracarboxylicdianhydride (BPDA) and PDA. X-ray diffraction results and their analyses by molecular modeling show that all the four polyimides exhibit extended chain conformations in various smectic-type ordered structures that form monomer repeat layers but differ in the details of interchain packing. Furthermore, the polyimide chains are highly aligned along the film plane.

Type
Research Article
Copyright
Copyright © Materials Research Society 1991

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References

1. Mittal, K.L., Polyirnides: Synthesis. Characterization, and Applications., Vol. I & II, Plenum, New York, 1984.Google Scholar
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8. Ree, M., Yoon, D.Y., Depero, L.E., and Parrish, W., .J. Polym. Sci., Polym. Phys. Ed.. submitted.Google Scholar

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