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The Crystal Solvate Phase of Heteroaromatic Rigid Polymers Yachin Cohen

Published online by Cambridge University Press:  26 February 2011

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Abstract

This work concerns solutions of the rigid polymers: poly(p-phenylene benzobisthiazole)-PBZT, and poly(p-phenylene benzobisoxazole)-PBO, in polyphosphoric acid (PPA), and formation of a crystal solvate phase by cocrystallization of polymer and solvent. Several crystal-solvate phases have been observed in these solutions, depending on temperature and the extent of exposure to moisture. The structure of these phases is studied by X-ray diffraction. Transitions between the solvated phases involve changes in the lateral packing as well as the axial registry of parallel chains. All PBOPPA crystal solvates observed so far exhibit three-dimensional order, whereas such order appears only in the PBZT-PPA phase obtained at low moisture levels. These differences are interpreted in terms of the state of protonation of the polymer chains, whereby the highly ordered structures reflect unique associations of the protonated polycation and PPA anions. Observations by electron microscopy indicate that the transition from the highly ordered crystal solvate phase to the less ordered phase involves formation of thin microfibrils, less than 100 Å in width. These microfibrils may be the precursor of the microfibrillar morphology observed in fibers formed from solutions of the rigid polymers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 195
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

1. Robinson, C., Trans. Faraday Soc. 52, 571 (1956).Google Scholar
2. Onsager, L., Ann. N.Y. Acad. Sci. 57, 627 (1949).Google Scholar
3. Flory, P.J., Proc. Roy. Soc. (London) A234, 60 (1956).Google Scholar
4. Miller, W.G., Wu, C.C., Wee, E.L., Santee, G.L., Rai, J.H., Goebel, K.G., Pure Appl. Chem. 8, 37 (1974).Google Scholar
5. Krigbaum, W.R., Cifferi, A., J., Polym. Sci., Polymer. Lett. Ed., 18, 253 (1980); Mol. Cryst. Liq. Cryst. 69, 273 (1981).Google Scholar
6. Blackwell, J., Lee, O.M., Kurz, D., Su, M.-Y., in Cellulose, edited by Young, R.A., Rowell, R.M. (J. Wiley, New York, 1985).Google Scholar
7. Iovleva, M.M., Papkov, S.P., Polym. Sci. USSR 24, 236 (1982).Google Scholar
8. Gardner, K.H., Matheson, R.R., Avakian, P., Chia, Y.T., Gierke, T.D., Abs. Pap. ACS 186(Aug), 37 (1983).Google Scholar
9. Banduryan, S.I., Iovleva, M.M., Ivanova, N.A., Naumov, V.G., Papkov, S.P., Polym. Sci. USSR 28, 828 (1986).Google Scholar
10. Allen, S. R., Filippov, A.G., Farris, R.J., Thomas, E.L., Wong, C.P., Bery, G.C., Chenevey, E.C., Macromol. 14, 1135 (1981).Google Scholar
11. Wolfe, J.F., Loo, B.H., Arnold, F.E., Macromol. 14, 915 (1981).Google Scholar
12. Adams, W.W., Kumar, S., (private communication).Google Scholar
13. Frost, H.H., M.Sc., thesis, Univ. of Massachusetts, Amherst 1981.Google Scholar
14. Cohen, Y., Frost, H.H., Thomas, E.L., in Reversible Polymeric Gels, edited by Russo, P.S., (American Chemical Soc. Symp. Ser. 135, 1986) p.181.Google Scholar
15. Cohen, Y., Thomas, E.L., Mol. Cryst. Liq. Cryst. 153 375 (1987).Google Scholar
16. Cohen, Y., Saruyama, Y., Thomas, E.L. (to be published).Google Scholar
17. Cohen, Y., Adams, W.W. (to be published).Google Scholar
18. Krause, S.J., Haddock, T.B., Lenhert, P.G., Hwang, W.F., Price, G.E., Helminiak, T.E., O'Brien, J.F., Adams, W.W., Polymer 29, 1354 (1988).Google Scholar
19. Roche, E.J., Takahashi, T., Thomas, E.L., in Fiber Diffraction Methods, edited by French, A.D. and Gardner, K.H., (Amer. Chem. Soc. Symp. Ser. 141, 1980) p.303.Google Scholar
20. Fratini, A.V., Adams, W.W., Am. Cryst. Assoc. Abstr. 13, 72 (1985).Google Scholar
21. Lee, C.C., Chu, S.G., Berry, G.C., J. Polym. Sci., Polym. Phys. Ed., 21, 1573 (1983).Google Scholar
22. Berry, G.C., Wei, C.C., Furukawa, K., Polymer Preprints ACS 27(l), 228 (1986).Google Scholar
23. Se, K., Berry, G.C. in Reversible Polymeric Gels, edited by Russo, P.S. (ACS Sym. Seri. 135, 1986) p.135.Google Scholar
24. Thilo, E., Adv. Inorg. Chem. Radiochem. 4, 1 (1962).CrossRefGoogle Scholar
25. Cohen, Y., Thomas, E.L., Macromol. 21, 433 (1988).Google Scholar