Visualization of polymer chain conformations in amorphous polyisocyanide langmuir-blodgett films by atomic force microscopy

Journal of the American Chemical Society

Volumn 132, Issue 16, 2010, Pages 5604-5606

  Kumaki, Jiro ^a,c   Kajitani, Takashi ^a   Nagai, Kanji ^a   Okoshi, Kento ^a   Yashima, Eiji ^a,b  

^a JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

^b NAGOYA UNIVERSITY   (Japan)

^c YAMAGATA UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

2-D SPACE; DIRECT OBSERVATION; HAIRPIN-LIKE; IDEAL MODEL; LANGMUIR MONOLAYERS; MOLECULAR LEVELS; POLYISOCYANIDES; POLYMER CHAIN CONFORMATION; POLYMER CHAIN PACKING; POLYMER CHAINS;

AMORPHOUS FILMS; ATOMIC FORCE MICROSCOPY; LANGMUIR BLODGETT FILMS; MICA; MONOLAYERS; POLYMER FILMS; SILICATE MINERALS; VISUALIZATION;

POLYMERS;

CYANIDE; MICA; POLYISOCYANIDE; UNCLASSIFIED DRUG; WATER;

ARTICLE; ATOMIC FORCE MICROSCOPY; CONFORMATION; CONTROLLED STUDY; FOURIER TRANSFORMATION; GEL PERMEATION CHROMATOGRAPHY; HYDROGEN BOND; HYDROPHOBICITY; LANGMUIR BLODGETT FILM; PRESSURE; ROOM TEMPERATURE; SURFACE PROPERTY; THERMOSTABILITY;

EID: 77952576069     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja908426u     Document Type: Article

References (13)

1. Gaines, G. L., Jr. Insoluble Monolayers at Liquid-Gas Interfaces; Interscience: New York, 1966.
2. Ulman, A. An Introduction to Ultrathin Organic Films: From Langmuir-Blodgett to Self-Assembly; Academic Press: New York, 1991.
3. Gaines, G. L., Jr. Langmuir 1991, 7, 834-839
4. Recent scanning near-field optical microscopy (SNOM) observations of a PMMA Langmuir-Blodgett (LB) film in which a small amount of the chains were fluorescence-labeled indicated that the polymer chains are highly segregated. See: Aoki, H., Morita, S., Sekine, R., and Ito, S. Polym. J. 2008, 40, 274-280
5. Chain images of an LB film composed of phthalocyaninato-polysiloxane oligomers having high stability toward an electron beam have been observed by TEM. See: Yase, K., Schwiegk, S., Lieser, G., and Wegner, G. Thin Solid Films 1992, 210/211, 22-25
6. Kumaki, J., Kawauchi, T., and Yashima, E. J. Am. Chem. Soc. 2005, 127, 5788-5789
7. Kajitani, T., Okoshi, K., Sakurai, S.-I., Kumaki, J., and Yashima, E. J. Am. Chem. Soc. 2006, 128, 708-709
8. Teerenstra, M. N., Vorenkamp, E. J., Shouten, A. J., and Nolte, R. J. M. Thin Solid Films 1991, 196, 153-162
9. Feng, F., Miyashita, T., Takei, F., Onitsuka, K., and Takahashi, S. Chem. Lett. 2001, 30, 764-765
10. Okoshi, K., Nagai, K., Kajitani, T., Sakurai, S.-I., and Yashima, E. Macromolecules 2008, 41, 7752-7754
11. 2/ru). The poly- 1 used in this study forms almost the same crystals (unpublished data). See: Onouchi, H., Okoshi, K., Kajitani, T., Sakurai, S.-I., Nagai, K., Kumaki, J., and Yashima, E. J. Am. Chem. Soc. 2008, 130, 229-236
12. The measured thickness of poly- 2 was underestimated because of penetration of the cantilever into the soft poly- 2 monolayer during the tapping-mode AFM measurements; the thicknesses of the poly- 1 and poly- 2 monolayers should be comparable because of the similar molecular structures and limiting areas of the π- A isotherms.
13. The 2D persistence lengths were determined using the freeware program 2D Single Molecules provided by Y. Roiter and S. Minko (available for download at http://people.clarkson.edu/~sminko). The chain conformations in the condensed monolayers are expected to be formed out of equilibrium and thus to have unusual hairpinlike conformations and folded bundle chains, resulting in smaller apparent persistence length values when estimated by AFM. However, evaluating only the straight parts of the chains and ignoring the parts with these unusual conformations provided a 1 order of magnitude longer apparent 2D persistence length of 350 ± 30 nm for poly- 1 (Figure S3 and Table S1), which is comparable with that in the solution (220 nm). For more details, see the Supporting Information.