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segment, one future work concerns the utility of the F-H
N
3 3 3
hydrogen-bonding-driven similar aromatic amide segments for
preparing the cross-linked copolymers.45 In this way, the func-
tions of both the intra- and intermolecular hydrogen bonds can
be investigated more accurately because the sizes of the corre-
sponding folded segments, if without additional substituents,
are very close to their intramolecular hydrogen-bonding-free
counterparts. It may also be possible to incorporate the folded
segment into the main chains of polymers. The corresponding
polymers should display new interesting mechanical properties
due to the reversible unfolding and refolding, as already revealed
by the intermolecular hydrogen-bonding-driven supramolecular
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Acknowledgment. We thank National Natural Science Foun-
dation of China (Nos. 20921091, 20732007, 20974118), Ministry
of Science and Technology of China (2007CB-808001), and
Science and Technology Commission of Shanghai Municipality
(09XD1405300) for financial support.
€
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Supporting Information Available: Additional SAXS dia-
grams, POM images, the method for determining the apparent
activation energy of Tg, Tg data obtained by DSC, creep, and
1
recovery plots, storage and loss modulus experiments, and H
and 13C NMR spectra. This material is available free of charge
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