Molecular orientations in flat-elongated and helical lamellar crystals of a main-chain nonracemic chiral polyester

Journal of the American Chemical Society

Volumn 122, Issue 1, 2000, Pages 72-79

  Li, Christopher Y ^a   Cheng, Stephen Z D ^a   Ge, Jason J ^a   Bai, Feng ^a   Zhang, John Z ^a   Mann, Ian K ^a   Chien, Lang Chy ^b   Harris, Frank W ^a   Lotz, Bernard ^c  

^a The University of Akron   (United States)

^b KENT STATE UNIVERSITY   (United States)

^c INSTITUT CHARLES SADRON   (France)

Author keywords

[No Author keywords available]

Indexed keywords

POLYMER;

ARTICLE; CHIRALITY; CRYSTAL; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRON DIFFRACTION; RACEMIC MIXTURE; TRANSMISSION ELECTRON MICROSCOPY;

EID: 0034639437     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja993249t     Document Type: Article

References (24)

1. Li, C. Y.; Yan, D.; Cheng, S. Z. D.; Bai, F.; He, T.; Chien, L. C.; Harris, F. W.; Lotz, B. Macromolecules 1999, 32, 524-527.
2. Li, C. Y.; Yan, D.; Cheng, S. Z. D.; Bai, F.; Ge, J. J.; He, T.; Chien, L. C.; Harris, F. W.; Lotz, B. Phys. Rev. B 1999, 60, 12675-12680.
3. Friedel, G. Ann. Phys. 1922, 18, 273-474. Saupe, A. Angew. Chem., Int. Ed. 1968, 7, 97-112.
4. Friedel, G. Ann. Phys. 1922, 18, 273-474. Saupe, A. Angew. Chem., Int. Ed. 1968, 7, 97-112.
5. Buckingham, A. D.; Ceasar, G. P.; Dunn, M. B. Chem. Phys. Lett. 1969, 3, 540-541.
6. de Gennes, P. G. Sloid State Commun. 1972, 10, 753-756.
7. Renn, S. R.; Lubensky, T. C. Phys. Rev. A 1988, 38, 2132-2147.
8. Goodby, J. W.; Waugh, M. A.; Stein, S. M.; Chin, E.; Pindak, R.; Patel, J. S. J. Am. Chem. Soc. 1989, 111, 8119-8125.
9. Goodby, J. W.; Waugh, M. A.; Stein, S. M.; Chin, E.; Pindak, R.; Patel, J. S. Nature 1989, 337, 449-452.
10. Helfrich, W.; Oh, C. S. Mol. Cryst. Liq. Cryst. 1971, 14, 289-292.
11. Saupe, A. Mol. Cryst. Liq. Cryst. 1969, 7, 59-74.
12. Goodby, J. W.; Slaney, A. J.; Booth, C. J.; Nishiyama, I.; Vuijk, J. D.; Styring, P.; Toyne, K. J. Mol. Cryst. Liq. Cryst. 1994, 243, 231-298.
13. For a recent summary, see: Keith, H. D.; Padden, F., Jr. Macromolecules 1996, 29, 7776-7786.
14. Briber, R. M.; Khoury, F. A. J. Polym. Sci. Polym. Phys. Ed. 1993, 31, 1253-1272.
15. Singfield, K. L.; Hobbs, J. K.; Keller, A. J. Cryst. Growth 1998, 183, 683-689.
16. Keith, H. D.; Padden, F. Jr.; Lotz, B.; Wittmann, J. C. Macromolecules 1989, 22, 2230-2238.
17. Singfield, K. L.; Brown, G. R. Macromolecules 1995, 28, 8006-8015.
18. Saracovan, I.; Cox, J. K.; Revol J.-F.; Manley R. St. J.; Brown, G. R. Macromolecules 1999, 32, 717-725.
19. Wittmann, J. C.; Lotz, B. Makromol. Rapid Commun. 1982, 3, 733-738.
20. Wittmann, J. C.; Lotz, B. J. Polym. Sci. Polym. Phys. Ed. 1985, 23, 205-226.
21. Bai, F.; Chien, L. C.; Li, C. Y.; Cheng, S. Z. D.; Percheck, R. Chem. Mater. 1999, 11, 1666-1671.
22. Li, C. Y.; Cheng, S. Z. D.; Ge, J. J.; Bai, F.; Zhang, J. Z.; Mann I. K.; Harris, F. W.; Chien, L.-C.; Yan, D.; He, T.; Lotz, B. Phys. Rev. Lett. 1999, 83, 4558-4561.
23. One of the reviewers proposed that "It does not seem necessary to invoke 'double-twisting' to explain the experimental results. In particular, complete twisting of the crystal about the a-axis would lead to chains which were no longer nominally normal to the lamellar surface. It seems more likely there would be only limited twisting of this sort, in fact of the bending type seen in the earlier dark field experiments. Such bending could also explain the dark field images give in Figure 8, since they could cause a rotation of the crystal sufficient to put it out of the Bragg condition on one-half of the crystal with respect to the other. It seems that an alternative explanation which would capture most of the experimental results is to have single-twist of a slightly bent lamellar crystal." Based on our ED and DF image results, the readers should make their own judgments.
24. Kleman, M. Adv. Phys. 1989, 38, 605-667.