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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2357
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dc.contributor.authorRaja, V.N.-
dc.contributor.authorShashidhar, R.-
dc.contributor.authorChandrasekhar, S.-
dc.contributor.authorBlumstein, A.-
dc.contributor.authorBlumstein, R.B.-
dc.contributor.authorKumar, S.-
dc.date.accessioned2007-05-19T11:20:11Z-
dc.date.available2007-05-19T11:20:11Z-
dc.date.issued1988-02-
dc.identifier.citationMolecular Crystals and Liquid Crystals, 1988, Vol.155, 1988 , p521-529en
dc.identifier.issn1058-725X-
dc.identifier.urihttp://hdl.handle.net/2289/2357-
dc.descriptionRestricted Access. Presented at the international conference on liquid crystal polymers held at Bordeaux in 1987.en
dc.description.abstractThe nematic-isotropic (NI) and crystalnematic (KN) transition temperatures were measured from atmospheric pressure to 1 kbar for a homologous series of thermotropic polyesters based on regularly alternating 2,2'-dimethylazoxybenzene mesogen and alkanedicarboxylic acid spacer. The values of (dP/dT) for the NI transitions show an odd-even alternation with n, consistent with the previously reported alternation of TNI and (b.DeltaH)NI. The characteristic temperature T* calculated for n = odd is approximately 300 K, similar to the values for noncybotactic nematics. On the other hand, for n =even, T* could not be reliably calculated, perhaps due to the existence of cybotactic ordering. At the KN transition there is no such clear alternation in (dP/dT). The specific volume changes (b.DeltaV)KN at melting are very small and comparable in magnitude with (b.DeltaV)NI. They are much smaller than the corresponding values for low molar mass liquid crystals and conventional polymers. This suggests that the crystals of these polyesters may have a high degree of imperfection.en
dc.format.extent246215 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherGordon and Breach Science Publishers.en
dc.relation.urihttp://dx.doi.org/10.1080/00268948808070392en
dc.rights1988 OPA (Overseas Publishers Association) N.V.en
dc.titlePhase transitions of nematic main-chain polyesters under high pressureen
dc.typeArticleen
Appears in Collections:Research Papers (SCM)

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