Smectic ordering in solutions and films of a rod-like polymer owing to monodispersity of chain length

Seungju M. Yu, Vincent P. Conticello, Guanghui Zhang, Christoph Kayser, Maurille J. Fournier, Thomas L. Mason and David A. Tirrell ()
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Seungju M. Yu: Polymer Science and Engineering Department
Vincent P. Conticello: Polymer Science and Engineering Department
Guanghui Zhang: Polymer Science and Engineering Department
Christoph Kayser: Polymer Science and Engineering Department
Maurille J. Fournier: University of Massachusetts
Thomas L. Mason: University of Massachusetts
David A. Tirrell: Polymer Science and Engineering Department

Nature, 1997, vol. 389, issue 6647, 167-170

Abstract: Abstract Solutions and melts of stiff (‘rod-like’) macromolecules often exhibit nematic liquid crystalline phases characterized by orientational, but not positional, molecular order1,2. Smectic phases, in which macromolecular rods are organized into layers roughly perpendicular to the direction of molecular orientation, are rare, owing at least in part to the polydisperse nature (distribution of chain lengths) of polymers prepared by conventional polymerization processes. Bacterial methods for polypeptide synthesis3, in which artificial genes encoding the polymer are expressed in bacterial vectors, offer the opportunity to make macromolecules with very well defined chain lengths. Here we show that a monodisperse derivative of poly(γ-benzyl α,L-glutamate) prepared in this way shows smectic ordering in solution and in films. This result suggests that methods for preparing monodisperse polymers might provide access to new smectic phases with layer spacings that are susceptible to precise control on the scale of tens of nanometres.

Date: 1997
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DOI: 10.1038/38254

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