Lyotropic liquid-crystalline behavior of polyisocyanodipeptides

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Title:	Lyotropic liquid-crystalline behavior of polyisocyanodipeptides
Author(s):	Metselaar, G.A. (291273696) Wezenberg, S.J. Cornelissen, J.J.L.M. (230245234) Nolte, R.J.M. (14853919X) Rowan, A.E. (298979357)
Publication year:	2007
Document type:	Article / Letter to editor
Journal:	Journal of Polymer Science Part A-Polymer Chemistry
ISSN:	0887-624X
Volume:	vol. 45
Issue:	iss. 6
Start page:	p. 981
End page:	p. 988
Abstract:	Rigid, helical polyisocyanodipeptides derived from alanine (PIAAs) that form lyotropic liquid-crystalline (LC) phases in tetrachloroethane Eire presented. An investigation by optical microscopy between crossed polarizers demonstrated that PIAAs prepared by the polymerization of isocyanodipeptide monomers with an activated tetrakis isocyanide nickel(II) catalyst could form cholesteric LC phases in tetrachloroethane in concentrations between 18 and 30 wt %. Cholesteric LC phases that were formed in solutions of greater than 25 wt % displayed a reversal of the cholesteric helix upon annealing at 50 degrees C. Diastereomeric PIAA mixtures displayed cholesteric LC behavior only when the PIAAs had the same helix screw sense. (c) 2006 Wiley Periodicals, Inc.
Subject:	Molecular Materials Physical Organic and Supramolecular Chemistry
Organization:	Physical Organic Chemistry UMCN Extern Molecular Materials
Organization (former):	Physical Organic and Supramolecular Chemistry
Appears in Collections:	Academic bibliography

Please use this identifier to cite or link to this item: http://hdl.handle.net/2066/34561