Hostname: page-component-84b7d79bbc-g78kv Total loading time: 0 Render date: 2024-07-25T11:09:09.326Z Has data issue: false hasContentIssue false

Morphological Consequences of Catalytic Hydrogenation of Polymers in the Bulk

Published online by Cambridge University Press:  21 February 2011

Laura R. Gilliom
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Dale W. Schaefer
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Get access

Abstract

When suitable catalysts are molecularly dispersed in polymers, the polymers can be modified without added solvent. This paper describes studies on the morphology of samples of trans-l,4-polybutadiene and syn-1,2-polybutadiene which have been partially deuterated in the bulk. The development of a peak in the SANS data for the 1,2-polybutadiene suggests the formation of small domains upon deuteration. Possible explanations for this observation, including chemical and physical heterogeneity, are evaluated. Results of SAXS and thermal measurements are also considered.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Gilliom, L. R., Macromolecules 22, 662 (1989).Google Scholar
2. See, for example, Marechal, E. “Chemical Modification of Synthetic Polymers” in Compreh. Polymer Sci., vol. 6, edited by Allen, G. and Berington, J. (Permagon Press, Oxford, 1989), p. 1.Google Scholar
3. Crabtree, R. H., Morehouse, S. M., Quirk, J. M., Inorg. Synth. 24, 173 (1986).Google Scholar
4. Hurd, A. J., Schaefer, D. W. and Glines, A. M., J. Appl. Cryst. 21, 864 (1988).Google Scholar
5. Koberstein, J. T., Mora, B. and Stein, R. S., J. Appl. Cryst. 13, 34 (1980).Google Scholar
6. Schaefer, D. W., Mark, J. E., McCarthy, D.; Jian, Li. Sun, C.-C. and Farago, B., in Polymer Based Molecular Composistes, edited by Schaefer, D. W. and Mark, J. E. (Mat. Res. Soc. Symp. Proc., XX, Pittsburgh, PA 1990) pp. XX–XX.Google Scholar
7. NMR analysis of the hydrogenation products in both cases indicated that no change in stereochemistry had occurred. The analysis of the spectra for 1,2-PB, however, was hindered by the fact that the starting material contained approximately 10% 1,4-connectivity.Google Scholar
8. Doi, Y., Yano, A., Soga, K., and Burfield, D. R., Macromolecules, 19, 2409 (1986).Google Scholar
9. Berger, M. and Buckley, D. J. J. Polym. Sci., A, 1, 2945 (1963).Google Scholar
10. Wang, P. and Woodward, A. E., Macromolecules, 20, 2718 (1987).Google Scholar
11. A similar endotherm was observed in the solution hydrogenation of cis-1,4-polybutadiene. Cowie, J. M. G. and McEwen, I. J., Ibid., 10, 1124 (1977).Google Scholar