Evidence of supercritical behavior in liquid single crystal elastomers

Temperature profiles of the first and the second moment of the nematic order parameter distribution function, as determined from the deuteron nuclear magnetic resonance line shapes, as well as heat capacity response, provide support for the supercritical scenario of the nematic-paranematic phase tra...

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Bibliographic Details
Published in:	Physical review letters Vol. 94; no. 19; pp. 197801.1 - 197801.4
Main Authors:	LEBAR, A, KUTNJAK, Z, ZUMER, S, FINKELMANN, H, SANCHEZ-FERRER, A, ZALAR, B
Format:	Journal Article
Language:	English
Published:	Ridge, NY American Physical Society 20-05-2005
Subjects:	Applied sciences Exact sciences and technology Inorganic and organomineral polymers Physicochemistry of polymers Properties and characterization Doping Thermotropic state Temperature effect NMR spectrometry Experimental study Nematic crystals Phase transitions Deuteron Investigation method Order parameter Liquid crystal polymers Nematic state Silicone elastomer
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Summary:	Temperature profiles of the first and the second moment of the nematic order parameter distribution function, as determined from the deuteron nuclear magnetic resonance line shapes, as well as heat capacity response, provide support for the supercritical scenario of the nematic-paranematic phase transition in liquid single crystal elastomers. The relative strength of the locked-in internal mechanical field with respect to the critical field can be decreased by swelling the elastomer samples with low molecular mass nematogen. By increasing the concentration of the dopant, critical and below-critical behavior is promoted.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.94.197801