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Science 28 November 1997:
Vol. 278. no. 5343, p. 1541
DOI: 10.1126/science.278.5343.1541b
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Polymers that form through hydrogen bonding could have interesting properties, such as reversibility of the polymerization through heating or concentration change. However, insufficient strength and directionality of the bonding between the monomer units have hampered progress. Sijbesma et al. (p. 1601; see the Perspective by McLeish, p. 1577) found that highly directional polymerization resulted for monomer units bearing a self-complimentary array of four hydrogen bonds. Viscosity, chain length, and composition can be tuned by changing conditions.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)