Nanoscale Fibrils and Grids: Aggregated Structures from Rigid-Rod Conjugated Polymers

Macromolecules

Volumn 32, Issue 5, 1999, Pages 1500-1507

  Kim, Jinsang ^a,b   McHugh, Sean K ^a   Swager, Timothy M ^a  

^a MASSACHUSETTS INSTITUTE OF TECHNOLOGY   (United States)

^b Massachusetts Institute of Technology   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

GLASS TRANSITION; LANGMUIR BLODGETT FILMS; LIQUID CRYSTAL POLYMERS; MOLECULAR STRUCTURE; MONOLAYERS; PLASTIC FILMS;

POLYPHENYLENE ETHYNYLENES;

AROMATIC POLYMERS;

EID: 0033537576     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma981774r     Document Type: Article

References (18)

1. Ulman, A. An Introduction to Ultrathin Organic Films: From Langmuir-Blodgett to Self-Assembly; Academic Press: Boston, 1991.
2. Light scattering studies on polymers closely related to those in this study have revealed a presistance length, based upon a wormlike chain model, of 15 nm. Cotts, P. M.; Swager, T. M.; Zhou, Q. Macromolecules 1996, 29, 7323.
3. Fibrous Protein Structure; Squire, J. M., Vibert, P. J., Eds.; Academic Press: San Diego, 1987.
4. Wegner, G. Thin Solid Films 1992, 216, 105.
5. Schweigk, S.; Vahlenkamp, T.; Xu, Y.; Wegner, G. Macromolecules 1992, 25, 2513.
6. Zhou, Q.; Swager, T. M. J. Am. Chem. Soc. 1995, 117, 7017.
7. For detailed photophysical and energy-transport studies of the films reported herein, see: Levitsky, I. A.; Kim, J.; Swager, T. M. J. Am. Chem. Soc., in press.
8. Ofer, D.; Swager, T. M.; Wrighton, M. S. Chem. Mater. 1995, 7, 418.
9. Polymer 2 was synthesized as reported previously in ref 10.
10. Zhou, Q.; Swager, T. M. J. Am. Chem. Soc. 1995, 117, 12593.
11. The areas are given in terms of a repeating unit, which involves one phenylene ethynylene group for 1 and two phenylene ethynylene groups for 2.
12. X-ray determination of the thickness was performed by analysis of Kiessig fringes.
13. The π-stacked structure is also consistent with the fact that 1's fluorescence is noticeably lower in films than in solution, which is expected for a highly symmetric aggregated conjugated polymer. See: Cornil, J.; dos Santos, D. A.; Crispin, X.; Silbey, R.; Brédas, J. L. J. Am. Chem. Soc. 1998, 120, 1289.
14. g) were determined on bulk samples by differential scanning calorimetry (DSC) (10°C/min).
15. Studies have established the relationship of the lines of flow with the alignment of monolayers. See: ref 5. Mareyama, T.; Friedenberg, M.; Fuller, G. G.; Frank, C. W.; Robertson, C. R.; Wegner, G. Thin Solid Films 1996, 273, 76.
16. Liquid Crystallinity in Polymers: Principles and Fundamental Properties; Ciferri, A., Ed.; VCH: Publishers: New York, 1991).
17. Hydrophobic substrates were produced by treating cleaned Si or glass surfaces with with HMDS.
18. Bjørnholm, T.; Greve, D. R.; Reitzel, N.; Hassenkam, T.; Kjaer, K.; Howes, P. B.; Larsen, N. B.; Bøgelund, J.; Jayaraman, M.; Ewbank, P. C.; McCullough, R. D. J. Am. Chem. Soc. 1998, 120, 7643.