Macromolecules, Vol. 38, No. 12, 2005
Supramolecular Polymers 5287
IR Spectroscopy. Infrared spectra were recorded at room
temperature on a Nicolet Avatar 320 spectrometer in KBr cells
of 0.05-2.5 cm path length.
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Light Scattering. Static and dynamic light scattering
measurements were performed with an experimental setup
2
7
0
previously described, at a wavelength (λ ) of 514.5 nm and a
(
16) Folmer, B. J. B.; Cavini, E.; Sijbesma, R. P.; Meijer, E. W.
temperature of 25 °C. Solutions were filtered through What-
Chem. Commun. 1998, 1847-1848.
man Anotop filters (porosity 0.2 µm). The specific refractive
(
(
17) Saville, P. M.; Sevick, E. M. Langmuir 1998, 14, 3137-3139.
18) (a) Terech, P.; Coutin, A. Langmuir 1999, 15, 5513-5525.
4
index increment for EHUT in CCl has been measured by
differential refractometry (dn/dC ) 0.0756 mL/g).
(
b) Terech, P.; Coutin, A. J. Phys. Chem. B 2001, 105, 5670-
5
676.
19) Castellano, R. K.; Nuckolls, C.; Rebek, J., Jr. Polym. News
000, 25, 44-52.
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9, 764-767.
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070-4073.
Supporting Information Available: Viscosimetric, scat-
tering, and calorimetric data. This material is available free
of charge via the Internet at http://pubs.acs.org.
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3
References and Notes
4
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(
(
(
1) Zimmerman, N.; Moore, J. S.; Zimmerman, S. C. Chem. Ind.
22) Yagai, S.; Iwashima, T.; Karatsu, T.; Kitamura, A. Chem.
1998, 604-610.
Commun. 2004, 1114-1115.
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P. Chem. Rev. 2001, 101, 4071-4097.
4) Folmer, B. J. B.; Sijbesma, R. P.; Versteegen, R. M.; van der
Rijt, J. A. J.; Meijer, E. W. Adv. Mater. 2000, 12, 874-878.
5) Sijbesma, R. P.; Beijer, F. H.; Brunsveld, L.; Folmer, B. J.
B.; Hirschberg, J. H. K. K.; Lange, R. F. M.; Lowe, J. K. L.;
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23) (a) Boileau, S.; Bouteiller, L.; Laupr eˆ tre, F.; Lortie, F. New
J. Chem. 2000, 24, 845-848. (b) Lortie, F.; Boileau, S.;
Bouteiller, L.; Chassenieux, C.; Dem e´ , B.; Ducouret, G.;
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Noronha, G. J. Org. Chem. 1992, 57, 3763-3765.
(25) The N-H stretching vibration of DBUT seems to be unaf-
fected by hydrogen bonding of the carbonyl group. This is in
line with the general behavior for urea derivatives (see for
examples: Jadzyn, J.; Stockhausen, M.; Zywucki, B. J. Phys.
Chem. 1987, 91, 754-757. Kozlova, T. V.; Zharkov, V. V. Zh.
Prikl. Spektrosk. 1981, 35, 303-311).
(
6) White, S. R.; Sottos, N. R.; Geubelle, P. H.; Moore, J. S.;
Kessler, M. R.; Sriram, S. R.; Brown, E. N.; Viswanathan, S.
Nature (London) 2001, 409, 794-797.
(
(
(
7) S o¨ ntjens, S. H. M.; Sijbesma, R. P.; van Genderen, M. H. P.;
Meijer, E. W. J. Am. Chem. Soc. 2000, 122, 7487-7493.
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Am. Chem. Soc. 2000, 122, 7876-7882.
(26) As shown in Figure 2, C is expected to increase when the
t
chain stopper content is decreased, but it was not possible to
investigate lower stopper proportions because of the limited
sensitivity of FTIR.
9) W u¨ rthner, F.; Thalacker, C.; Sautter, A.; Sch a¨ rtl, W.; Ibach,
W.; Hollricher, O. Chem.sEur. J. 2000, 6, 3871-3886.
(
(
10) Gibson, H. W.; Yamaguchi, N.; Jones, J. W. J. Am. Chem.
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(
27) Chassenieux, C.; Nicolai, T.; Durand, D. Macromolecules
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