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Curing and Alignment of Liquid Crystalline Epoxy Networks

Published online by Cambridge University Press:  25 February 2011

C. K. Ober ,
G. G. Barclay ,
K I. Papathomas  and
D. W. Wang
C. K. Ober
Affiliation:
Materials Science & Engineèring, Bard Hall, Cornell University, Ithaca, NY 14853-1501
G. G. Barclay
Affiliation:
Materials Science & Engineèring, Bard Hall, Cornell University, Ithaca, NY 14853-1501
K I. Papathomas
Affiliation:
Systems Technology Division, IBM Corporation, Endicott, NY 13760
D. W. Wang
Affiliation:
Systems Technology Division, IBM Corporation, Endicott, NY 13760
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Abstract

Liquid crystalline epoxy networks have been prepared from glycidyl terminated polyether oligomers of varying molecular weight. These oligomers were prepared by functionalizing hydroxy terminated oligomers based on 4,4'- dihydroxy-α-methylstilbene and α,ω-dibromoalkanes with glycidyl groups. Curing of these oligomers was carried out either within their nematic mesophase or in their isotropic state. Different thermal properties were observed after curing under these two sets of conditions. Extremely low values of the coefficient of thermal expansion in the range of 15 to 60 ppm/°C were achieved. To produce aligned thermosets, orientation of the liquid crystalline phase was induced during the curing process by a magnetic field. Orientation of these networks was measured by wide angle x-ray diffraction (WAXD).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 203: Symposium D – Electronic Packaging Materials Science V , 1990 , 265
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

1) deGennes, P. G., Phys. Letters, A28, 725, (1969).Google Scholar
2) Uryu, T., Sato, K. and Kato, T., Polymer Preprints, Japan, 37, 217, 1988 Google Scholar
3) Uryu, T., Sato, K. and Kato, T.., Abstract of the Annual Meeting of the Chemical Society of Japan., 1987.Google Scholar
4) Müller, H.P. et al. , US Patent. 4.764.581, Aug, 16, 1988.Google Scholar
5) Müller, H.P. et al. , US Patent. 4.762.901, Aug. 9, 1988.Google Scholar
6) Hoyt, A.E. and Benecewicz, B. C., J. Polym. Sci: Part A: Polym. Chem., 28, 3408, (1990).Google Scholar
7) Huang, S.J., Feldman, J.A. and Cercena, J.L., Polymer Preprints, 29(2), 348, (1988).Google Scholar
8) Shaffer, T. and Percec, V., J. Polym. Sci.:Polym. Letters. Ed., 23, 185 (1985).Google Scholar
9) Balta-Calleja, F. J. and Vonk, C., in “X-ray Scattering of Synthetic Polymers”, Jenkins, A.D., ed., Polymer Science Library 8, Chpt. 6, p. 205, Elsevier (1989).Google Scholar
10) Warner, M., Gelling, K. P., and Vilgis, T.A., J. Chem. Phys., 88, 4008 (1988).Google Scholar