Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/666
Título: Deuterium NMR Study of Orientational Order in Cellulosic Network Microfibers
Autor: Kundu, S.
Feio, G.
Pinto, L. F. V.
Almeida, Pedro Lúcio Maia Marques de
Figueirinhas, J. L.
Godinho, Maria Helena
Palavras-chave: Liquids-crystals
Phase-transition
Nanofibers
Fibers
Layer
Data: 13-Jul-2010
Editora: Amer Chemical Soc
Citação: Kundu S, Feio G, Pinto L F V, Almeida P L, Figueirinhas J L, Godinho M H.Deuterium NMR Study of Orientational Order in Cellulosic Network Microfibers.Macromolecules. 2010; 43 (13): 5749-5755.
Relatório da Série N.º: 13
Resumo: Deuterium NMR was used to investigate the orientational order in a composite cellulosic formed by liquid crystalline acetoxypropylcellulose (A PC) and demented nematic 4'-penty1-4-cyanobiphenyl (5CB-4 alpha d(2)) with the per centage of 85% A PC by weight Three forms of the composite including electro spun microfibers, thin film and bulk samples were analyzed The NMR results initially suggest two distinct scenarios, one whet e the 503-alpha d(2), is confined to small droplets with dimensions smaller than the magnetic coherence length and the other where the 503-alpha d(2) molecules arc aligned with the A PC network chains Polarized optical microscopy (POW from thin film samples along with all the NMR results show the presence of 5CB-alpha d(2) droplets in the composite systems with a nematic wetting layer at the APC-5CB-alpha d(2) interface that experiences and order disorder transition driven by the polymer network N-I transition The characterization of the APC network I-N transition shows a pronounced subcritical behavior within a heterogeneity scenario.
Peer review: yes
URI: http://hdl.handle.net/10400.21/666
ISSN: 0024-9297
Aparece nas colecções:ISEL - Física - Artigos

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